Postal Service (United States) — NAICS 491110

A Histometrics industry primer for public-market and private investors.

1. Overview

NAICS (North American Industry Classification System) code 491110, "Postal Service," is essentially one organization: the United States Postal Service (USPS), a self-financing, government-owned federal establishment that carries letters and packages to every U.S. address under a universal service obligation (USO) — the legal duty to serve the whole country, including unprofitable routes, at uniform prices.[1][12] In fiscal year 2025 (ended September 30, 2025), USPS took in $80.5 billion in operating revenue, delivered to 170.4 million addresses, and employed roughly 620,000 people — one of the largest civilian workforces in the country.[1][4]

Here is the catch for anyone thinking about "investing" in this industry: you cannot buy the Postal Service. It has no publicly traded stock, pays no dividend, and is owned by the federal government. It also loses money — a $9.0 billion net loss in FY2025, its latest in an unbroken decade of losses.[1][10] So the investable question is not "should I own the post office" but "how do I get exposure to the money that flows around it." Public routes are indirect: a niche real-estate company that owns the buildings USPS rents, plus parcel carriers, mailing-technology firms, and print/presort providers that ride the same network. Private routes include owning post-office real estate directly, running a postal contract business, or backing regional delivery and shipping-software operators. The core question across all of them is whether package growth, pricing, and productivity can offset the structural decline of letters and the fixed cost of serving every address.

2. What it is and how it's structured

In scope (491110): accepting, collecting, sorting, routing, processing, and delivering letters, printed matter, and mailable packages under the universal-service mandate — plus the retail post-office network.[12] In practice this is USPS plus a thin layer of private contractors that operate on the Postal Service's behalf: Contract Postal Units (CPUs) and Village Post Offices (retail counters inside pharmacies, grocers, and gift shops) and Highway Contract Routes (HCRs — private trucking firms that move mail between facilities and, in some areas, deliver it).[11]

Ownership mix: overwhelmingly federal. USPS is not a normal agency funded by taxes — it has run on its own postage and service revenue since the early 1980s and receives no annual operating appropriation, though Congress can authorize targeted support.[7][10] But it is not a private company either: its leaders (an 11-member Board of Governors and the Postmaster General) are political appointees, its prices and service standards are regulated, and it can borrow only from the U.S. Treasury.[7][10] The private-contractor slice is small and fragmented — thousands of tiny operators.[6]

What it EXCLUDES (and where much of the private money actually is):

That exclusion matters. The household names an investor associates with "shipping" (UPS, FedEx) are not in 491110 — they sit in the courier codes and are legally distinct from the postal monopoly. Many economically important private companies are classified outside 491110, so a narrow industry screen on this code is misleading. For practical purposes, code 491110 is the U.S. mail system.

3. How big it is

Our ingested ground-truth federal statistics for NAICS 491110 contain essentially one figure: the U.S. Small Business Administration (SBA) small-business size standard of $9 million in annual receipts — the revenue ceiling below which a private postal-service firm counts as "small" for federal contracting.[3] We do not have Census establishment, employment, or payroll figures for this code, and that absence is itself the story.

The undercount is total and structural. Census business programs count private employers; the Statistics of U.S. Businesses (SUSB) program explicitly excludes the Postal Service and NAICS 491, and the Economic Census generally excludes government-operated establishments.[13] The entity that is this industry — USPS — is a federal establishment, so standard 491110 business statistics capture only the small private contractors ($9 million-and-under firms), not the ~$80 billion organization that does more than 99% of the work. Any "industry size" drawn from private-business data would be off by orders of magnitude.

The real scale comes from USPS's own reporting (FY2025):[1][4]

These are operator figures, not a private-industry market size. For long-run context, the Postal Regulatory Commission (PRC) reports total mail volume peaked at about 213 billion pieces in FY2006 and had fallen to roughly 109 billion in FY2025.[7]

4. The investable universe

There is no way to own USPS itself — it has no equity and no public debt. The public and private options are all around it. (Tickers appear here and in §10 only; the prose sections deliberately treat this as an industry, not a stock sector.)

The honest summary: listed pure-plays are essentially one. Postal Realty Trust (PSTL) is a real-estate bet on USPS as a tenant, not on the mail business itself — it collects rent from a highly reliable, government-backed lessee and grows by buying post-office properties from the thousands of individual landlords who historically owned them.[5] It is a small-cap income vehicle, not a proxy for postal volumes or profits. The other names give exposure to package logistics or mailing infrastructure, but all sit outside code 491110.

Private and other routes are where much real exposure lives:

• Post-office real estate directly — a large share of the ~31,000 post offices are on leased land owned by private landlords, a fragmented, income-oriented niche PSTL is consolidating.[5]
• Postal contract businesses — Contract Postal Units, Village Post Offices, and Highway Contract Routes: small-business franchises of the postal network, the population the $9 million SBA size standard is written for.[3][11]
• Regional carriers and logistics operators — e.g., Greenbriar Equity Group's OnTrac, a private non-asset-based parcel network competing for e-commerce deliveries;[22] Asendia, a La Poste / Swiss Post joint venture in international mail and parcel consolidation;[23] and ShipStation Global, formed from the 2026 merger of Auctane and Worldwide Express Group under Thoma Bravo, combining shipping software with third-party logistics.[24]

5. How the money works

USPS is not built to maximize profit — by law it is meant to roughly break even while providing universal service. But it earns and spends like a very high-fixed-cost logistics network, and the same unit economics decide whether it sinks or floats.

Revenue = pieces × price, across two regulatory pools:

• Market Dominant products — First-Class letters, Marketing (advertising) Mail, and Periodicals. These carry monopoly or high-market-power characteristics and are capped by the PRC. First-Class Mail is the crown jewel: it rides a legal monopoly on letter delivery, so its margins are high and it historically funded the whole network. But its volume is in structural decline (see §6).[8][14]
• Competitive products — packages and services such as Priority Mail and Ground Advantage. These have more pricing flexibility but must cover their attributable costs by law. This is the one growth lever, and where USPS fights UPS, FedEx, and Amazon for volume.[1][9][14] Shipping and packages generated $32.6 billion in FY2025, with Ground Advantage and strategic price increases offsetting weaker legacy parcel products even as package volume slipped.[1]

Cost is dominated by people and a fixed network. Compensation and benefits are the large majority of the ~$89.8 billion total operating expense; the delivery network (every address, six days a week) is largely fixed regardless of how much mail moves through it.[1][7] That is the core squeeze: volume falls, but the network cost doesn't. Cost per piece rises as billions of pieces disappear from the same 170-million-address route structure. The metrics that matter here are route density (pieces per delivery point), cost per stop and per piece, labor hours per route, and processing throughput — not a single "capacity utilization" headline.

Read two loss numbers, not one. USPS reports both a GAAP (Generally Accepted Accounting Principles) net loss and a "controllable loss":

• Controllable loss — what current management can actually influence — was about $2.7 billion in FY2025.[1]
• GAAP net loss was $9.0 billion, most of it non-cash charges outside management's control: amortization of unfunded retiree pension and health liabilities, and workers'-compensation revaluations tied to interest rates.[1][10] The FY2024 split was similar (~$1.8 billion controllable vs. a $9.5 billion GAAP loss).[2]

The cross-subsidy is the whole ballgame. Monopoly letter revenue is meant to pay for the money-losing obligation to serve every address at one price. The PRC estimated total USO cost at roughly $6.3 billion in 2023, with six-day delivery the single largest component — and it has found the obligation now costs more than the letter monopoly is worth.[7] When the profitable product shrinks faster than the network can shrink, the math stops working.

Capital and liquidity are unusually tight. USPS has no equity and no access to private capital markets. It can borrow only from the Treasury and is pinned at its $15 billion statutory debt limit, unchanged since 1992.[10] It ended FY2025 with about $8.2 billion in cash — roughly one month of operating expenses. With ~$9 billion annual losses and no borrowing headroom, that thin liquidity turns a slow structural problem into a hard constraint.[10]

6. What drives demand

• The secular decline of letters. First-Class Mail peaked in 2001 at about 103.7 billion pieces and has since roughly halved as email, online billing, and digital payments replaced physical correspondence.[8] This is the defining, one-directional force on the industry.
• E-commerce parcels — the offset. Package volume has partly filled the gap; USPS's last-mile reach to every rural address makes it a natural delivery partner. But parcels are competitive and lower-margin, so they add revenue faster than profit.[1][9]
• Advertising / Marketing Mail rises and falls with the economy and with advertisers' shift to digital — a cyclical, slowly declining stream.[1]
• Cross-border shipping. International consolidators and DHL eCommerce create demand for USPS last-mile and customs-linked handoffs.[16][23]
• Election cycles and government mailings create periodic bumps (ballots, census, benefit notices).
• Population and address growth raises the cost of universal service (more than a million new delivery points a year, up 1.1% in FY2025) even as mail per address falls.[4]
• Pricing and affordability. Higher rates can lift revenue but may accelerate migration of volume to digital channels or competing carriers.[8]

7. Regulation

USPS operates inside a dense statutory frame; the rules — not a market — set its prices and obligations:

• Postal Regulatory Commission (PRC): an independent federal agency that sets rate limits for Market Dominant products, reviews compliance, monitors the cost floor for Competitive products, and reports on the universal-service obligation and letter monopoly.[7][14] USPS proposes prices; the PRC establishes the framework. The modern system uses a cap tied to the Consumer Price Index (CPI) plus other statutory authorities rather than pure cost-of-service pricing — a structural limit on how fast revenue can rise to meet costs.[14]
• Universal Service Obligation (USO): the legal duty to serve every American at uniform, affordable rates, and to maintain a nationwide collection, sorting, and delivery system.[10][12]
• The postal monopoly: exclusive federal rights over ordinary letter delivery and access to customers' mailboxes, meant to fund the USO.[10] The PRC's finding that the USO now costs more than the monopoly is worth is central to the reform debate.[7]
• Postal Service Reform Act (PSRA) of 2022: the most consequential recent law. It repealed the crippling requirement to pre-fund decades of future retiree health benefits, moved retirees toward Medicare integration, and codified six-day delivery and an integrated mail-and-package network.[7] It removed a major accounting drag but did not fix the underlying volume/cost problem.

8. Competitive dynamics and consolidation

Two very different competitive worlds:

In letters, there is no direct competition — the monopoly is the point. USPS's rival there is substitution (email, digital bills), not another carrier.[8]

In packages, competition is fierce and consolidating around scale. 2024 U.S. domestic parcel volume was about 23.8 billion packages, split roughly:[9]

• USPS ~7.2 billion (~30%) — #1 by volume, thanks to universal last-mile reach (its own FY2025 shipping-and-packages count was 6.8 billion pieces on the USPS fiscal-year basis).[1][9]
• Amazon Logistics ~6.1 billion (~26%) — the fastest riser, having built its own network and pulled volume away from USPS and the couriers; analysts project it could become the largest U.S. parcel carrier later this decade.
• UPS ~4.8 billion (~20%) and FedEx ~3.4 billion (~14%) — the traditional express duopoly, with higher revenue per package.
• Other carriers ~2.3 billion (~10%) — regional and retailer-built networks, the fastest-growing slice.

USPS's edge is nationwide reach, dense address access, and the ability to run mail and packages on one network; its drag is the universal-service obligation, high fixed costs, labor intensity, and falling pieces per delivery point. Scale is decisive — larger private networks spread sorting, transportation, technology, and procurement costs across more volume, and private-equity-backed roll-ups increasingly join carrier access, freight brokerage, and shipping software (the Auctane–Worldwide Express merger into ShipStation Global is a recent example).[24]

The newer twist: USPS is now monetizing its last-mile network rather than only defending it. In 2026 it opened a bid platform for outside access to more than 18,000 delivery destination units and local processing centers,[25] and DHL eCommerce signed an exclusive, multiyear last-mile agreement (§10).[16] Consolidation on the real-estate side (PSTL rolling up scattered post-office landlords) is a quieter, income-driven form of the same trend.[5]

9. Risks

• Structural, not cyclical, decline in the profitable product. Letter volume has fallen for two decades with no floor in sight; the monopoly business erodes faster than the fixed network can be cut.[8]
• Weak service and cost-coverage performance. The PRC found that 20 of 27 Market Dominant products or categories missed FY2025 service targets, 4 of 28 Market Dominant products failed to cover costs, and 18 Competitive products did not cover their attributable costs — pressure on both reliability and the statutory cost floor.[9]
• Liquidity cliff. ~$8.2 billion cash, ~one month of expenses, no borrowing room under a frozen $15 billion Treasury cap, and ~$9 billion annual losses. A shock (recession, volume drop, benefit-cost spike) has little cushion.[10]
• Turnaround execution risk. The 10-year "Delivering for America" plan promised roughly $40 billion of investment and multibillion-dollar annual savings, but FY2025 losses landed near forecast only after one-time early-retirement costs, and consolidating plants and slowing some delivery standards has drawn service-quality criticism.[1][10]
• Political and governance risk. Leadership churn (Postmaster General Louis DeJoy resigned in 2025; ex-Waste Management CEO and former FedEx director David Steiner took over July 15, 2025) and active talk of restructuring or privatization create deep uncertainty about the entity's future form.[6] For PSTL holders, the tail risk is a materially different or shrunken USPS as tenant.
• Rate-cap regulation. Prices can't rise fast enough to outrun cost growth, by design.[14]
• Package competition and Amazon insourcing threaten the one growth lever; parcel pricing and customer concentration add volatility.[9]
• Private-operator leverage. Private-equity-owned carriers and software roll-ups carry integration, refinancing, and customer-concentration risk.[24]

10. How to invest and the outlook

There is no single "industry multiple" here — use a layered approach.

Public routes (few and indirect):

• Postal Realty Trust (PSTL) — the only listed pure-play, a small-cap REIT collecting government-backed rent from ~1,900 post offices; underwrite occupancy, lease terms, rent growth, interest-rate sensitivity, and the fragile finances of its single dominant tenant.[5]
• Parcel carriers (UPS, FDX, DHL) and mailing infrastructure (PBI, QUAD, AMZN) — ways to bet on package logistics and mail technology, but each is a different industry (NAICS 492 or mailing services) competing with or supplying USPS rather than being it.[16][17][18][19][20][21]
• USPS debt/equity: not available. No public securities exist.[1]

Private routes:

• Post-office real estate — single-tenant, USPS-leased buildings bought for stable income; the fragmented landlord base PSTL is rolling up.[5]
• Postal contract businesses — Contract Postal Units, Village Post Offices, and Highway Contract Routes; underwrite contract duration, renewal rights, USPS/anchor concentration, fuel and wage pass-through, route density, and exit liquidity.[3][11]
• Regional carriers and shipping software — OnTrac, Asendia, ShipStation Global and peers.[22][23][24]

What's actually changing. USPS is trying to sell access to its last-mile network more aggressively. In 2026 it opened bidding for entry to more than 18,000 delivery destination units and local processing centers,[25] and DHL eCommerce entered an exclusive, long-term USPS last-mile agreement valued at more than $10 billion — the largest in the two organizations' 25-year relationship — tapping the Postal Service's reach to 170 million-plus delivery points six days a week.[16] UPS has likewise disclosed a USPS final-mile arrangement for some services starting in 2026.[17]

Reported outlook. FY2025 volume fell 3.3%, total revenue (including investment and interest income) rose about 1.1%, shipping-and-packages revenue rose ~1%, and USPS booked a $9.0 billion net loss.[1] The base case is a durable but shrinking mail utility with a contested package-growth lane. The reported facts are unambiguous — a decade of losses, a shrinking core product, one month of cash. The forward judgment is that USPS's service is not going away (it is legally mandated), but its structure, prices, and delivery standards are genuinely in play. For the handful of ways an investor can touch this industry, the most attractive opportunities are likely selective — parcel, automation, mailing software, presort, and postal real estate — rather than an undifferentiated bet on a USPS turnaround; and that policy/structural uncertainty, more than mail volume itself, is the real variable.

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Sources

1. U.S. Postal Service, "U.S. Postal Service Reports Fiscal Year 2025 Results," Nov. 14, 2025. https://about.usps.com/newsroom/national-releases/2025/1114-usps-reports-fiscal-year-2025-results.htm
2. U.S. Postal Service, "U.S. Postal Service Reports Fiscal Year 2024 Results," Nov. 14, 2024. https://about.usps.com/newsroom/national-releases/2024/1114-usps-reports-fiscal-year-2024-results.htm
3. U.S. Small Business Administration, "Table of Small Business Size Standards" (NAICS 491110 = $9.0 million; Histometrics ingested ground-truth), effective 2023. https://web.data.sba.gov/en/dataset/small-business-size-standards
4. U.S. Postal Service, "Size and Scope," Postal Facts, 2025. https://facts.usps.com/size-and-scope/
5. Postal Realty Trust, Inc. (NYSE: PSTL), 2025 Form 10-K and FY2025 investor materials. https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001759774&type=10-K and https://postalrealtytrust.com/
6. U.S. Postal Service, "Board of Governors appoints David Steiner to be 76th Postmaster General and CEO," May 2025. https://about.usps.com/newsroom/national-releases/2025/0509-usps-bog-appoints-david-steiner-to-be-76th-pmg-and-ceo-of-usps.htm
7. Postal Regulatory Commission, "State of the Postal Service" and universal-service/monopoly reporting; and Postal Service Reform Act of 2022. https://www.prc.gov/state-of-the-postal-service and https://en.wikipedia.org/wiki/Postal_Service_Reform_Act_of_2022
8. U.S. Postal Service, "First-Class Mail Volume Since 1926," and USPS Office of Inspector General historical mail-volume analysis. https://about.usps.com/who/profile/history/first-class-mail-since-1926.htm
9. Supply Chain Dive / ShipMatrix, "FedEx, UPS alternatives grew market share in 2024," 2025. https://www.supplychaindive.com/news/fedex-ups-usps-amazon-2024-market-share/745686/
10. Federal News Network, "USPS sees $9 billion net loss in FY 2025, renews push to borrow more from Treasury," Nov. 2025. https://federalnewsnetwork.com/agency-oversight/2025/11/usps-sees-9-billion-net-loss-in-fy-2025-renews-push-to-borrow-more-from-treasury/
11. U.S. Postal Service, "Contract Postal Unit," supplier materials, and USPS OIG reporting on Contract Postal Units / Village Post Offices / Highway Contract Routes. https://about.usps.com/what/business-services/suppliers/becoming/contract-postal-unit.htm and https://www.uspsoig.gov/
12. U.S. Census Bureau, "2022 NAICS: 491110 Postal Service" (definition and adjacent codes). https://www.census.gov/naics/?details=491110&input=491110&year=2022
13. U.S. Census Bureau, "About Statistics of U.S. Businesses (SUSB)" (excludes Postal Service / NAICS 491). https://www.census.gov/programs-surveys/susb/about.html
14. Postal Regulatory Commission, "Who Sets Postal Rates?" (Market Dominant vs. Competitive; CPI-based cap). https://www.prc.gov/who-sets-postal-rates
15. Postal Regulatory Commission, "FY 2025 Annual Compliance Determination Highlights," 2026. https://www.prc.gov/
16. U.S. Postal Service / DHL Group, "DHL eCommerce and USPS Enter $10 Billion-Plus, Long-Term Exclusive Agreement," May 28, 2026. https://about.usps.com/newsroom/national-releases/2026/0528-dhl-ecommerce-and-usps-enter-10-billion-plus-long-term-exclusive-agreement.htm
17. United Parcel Service, 2025 Form 10-K (USPS final-mile agreement beginning 2026). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001090727&type=10-K
18. FedEx Corporation, 2025 Form 10-K. https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001048911&type=10-K
19. Pitney Bowes Inc., 2025 Form 10-K (mailing/shipping technology and presort). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0000078814&type=10-K
20. Quad/Graphics, Inc., 2025 Form 10-K (print, mail preparation, USPS workshare). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001481792&type=10-K
21. Amazon.com, Inc., 2025 Form 10-K. https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001018724&type=10-K
22. Greenbriar Equity Group, "OnTrac." https://www.greenbriarequity.com/investment/ontrac/
23. Asendia (La Poste / Swiss Post joint venture), "About Asendia." https://www.asendia.com/about-asendia
24. Thoma Bravo, "WWEX Group and Auctane Complete Merger, Creating Leading Logistics Provider ShipStation Global," 2026. https://www.thomabravo.com/press-releases/wwex-group-and-auctane-complete-merger-creating-leading-logistics-provider-shipstation-global
25. U.S. Postal Service, "USPS Opens Bid Solicitation Platform for Entry to Last-Mile Delivery Network," 2026. https://about.usps.com/newsroom/local-releases/sd/2026/0120-usps-opens-bid-solicitation-platform-for-entry-to-last-mile-delivery-network.htm