Postal Service (United States) — NAICS 49111

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

1. Overview

NAICS (North American Industry Classification System) code 49111, "Postal Service," is a rollup level that contains exactly one child industry — 491110, also "Postal Service." At this level of the taxonomy the two are effectively the same thing: the U.S. mail system, which in practice means 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]

Because 49111 has no siblings inside it, this page is deliberately short. It gives the rollup-level picture and this level's own ground-truth stats, then points you to the 491110 primer for the full detail — the investable names, the unit economics, the regulatory frame, and the risks. Nothing is lost by treating 49111 and 491110 as one; the numbers below are inherited directly from the single child.

The one investing fact worth repeating up top: you cannot buy the Postal Service. It has no publicly traded stock, no public debt, pays no dividend, and is owned by the federal government — and it loses money (a $9.0 billion net loss in fiscal year 2025).[1][10] Every route to "exposure" is indirect, and they are catalogued in the child primer.

2. What's inside — and why this level equals its one child

NAICS is a nested system: each broader code fans out into narrower ones. Most 5-digit "industry" codes split into several 6-digit "national industries." 49111 is the exception — it splits into a single 6-digit code, 491110. The rollup and the leaf therefore cover identical ground:

In scope (both codes): 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 that is USPS plus a thin layer of private contractors operating on its behalf (Contract Postal Units, Village Post Offices, and Highway Contract Routes).[11]

Out of scope (and where much private money actually sits): private courier and express parcel carriers — UPS, FedEx, DHL, Amazon Logistics — are not here. They fall under the separate courier codes (NAICS 492), are legally distinct from the postal monopoly, and are covered as adjacencies in the 491110 primer.[12] For practical purposes, code 49111 is the U.S. mail system.

3. Size (rollup figures and undercount caveat)

We have no ingested official statistics keyed to NAICS 49111 specifically (no Census establishment, employment, or payroll metrics at this node in our ground-truth data). The figures below are inherited from the single child, 491110, and are the correct rollup totals because the level and its child are identical.[3][13]

The undercount at this code is total and structural. Standard business statistics count private employers, and the Census Statistics of U.S. Businesses (SUSB) program explicitly excludes the Postal Service and all of NAICS 491; the Economic Census generally excludes government-operated establishments.[13] The one federal figure our data carries for the child is the U.S. Small Business Administration (SBA) small-business size standard of $9 million in annual receipts — the ceiling below which a private postal-service contractor counts as "small."[3] That captures only the small contractors, not the ~$80 billion organization doing more than 99% of the work. Any "industry size" drawn from private-business data at this code would be off by orders of magnitude.

The real scale comes from USPS's own reporting (fiscal year 2025, ended September 30, 2025):[1][4]

These are operator figures, not a private-industry market size.

4. Investable universe (where value concentrates)

With only one child, there is no "spread across sub-industries" to map — value concentration at 49111 is exactly what it is at 491110. In short: there is no way to own USPS itself, and the listed pure-plays reduce to essentially one name — Postal Realty Trust (NYSE: PSTL), a small-cap real estate investment trust (REIT) that owns roughly 1,900 post-office buildings and leases them back to USPS.[5] It is a bet on USPS as a reliable government-backed tenant, not on mail volumes or profits. Every other touchpoint — parcel carriers, mailing-technology and print/presort firms, private regional carriers, and post-office real estate held directly — sits around the code rather than inside it. The full table of names, tickers, and private routes is in the 491110 primer, §4.

5. How the money works

Identical to the child: USPS is a very high-fixed-cost logistics network meant by law to roughly break even while providing universal service. Revenue is pieces × price across two regulatory pools — Market Dominant products (First-Class letters, Marketing Mail, Periodicals; monopoly-protected but price-capped and in structural decline) and Competitive products (packages such as Priority Mail and Ground Advantage; the one growth lever, and where USPS fights UPS, FedEx, and Amazon).[1][8][9][14] Cost is dominated by people and a fixed six-day delivery network, so as billions of pieces disappear from the same 170-million-address route structure, cost per piece rises — the core squeeze. Read two loss numbers: a ~$2.7 billion controllable loss (what management can influence) versus the $9.0 billion GAAP net loss (mostly non-cash retiree and workers'-compensation charges).[1][10] The cross-subsidy — monopoly letter revenue paying for the money-losing duty to serve every address — is the whole ballgame, and it is breaking. Full mechanics are in the 491110 primer, §5.

6. Demand drivers

Same forces as the child, in one place: the secular decline of First-Class letters (peaked ~103.7 billion pieces in 2001, since roughly halved by email and digital billing) is the defining one-directional force; e-commerce parcels partly offset it but at lower margin; Marketing Mail is cyclical and slowly declining; cross-border shipping, election and government mailings, and address growth add smaller effects — the last raising the cost of universal service even as mail per address falls.[1][4][8][9] Detail in the 491110 primer, §6.

7. Regulation

Unchanged from the child. USPS operates inside a dense statutory frame: the independent Postal Regulatory Commission (PRC) sets rate limits (a cap tied to the Consumer Price Index for Market Dominant products) and monitors the cost floor for Competitive products; the universal service obligation mandates nationwide, uniform-price service; the postal monopoly on ordinary letters is meant to fund it; and the Postal Service Reform Act of 2022 repealed the retiree-health pre-funding mandate and codified six-day delivery.[7][10][14] Because prices are capped, revenue structurally cannot rise fast enough to outrun cost growth. Full treatment in the 491110 primer, §7.

8. Consolidation

At this single-child level there is no sub-industry consolidation to track; the dynamics are those of the child. In letters there is no direct competition — the rival is substitution (email), not another carrier. In packages the fight is fierce and consolidating around scale: 2024 U.S. domestic parcel volume was ~23.8 billion, split roughly USPS ~30%, Amazon Logistics ~26%, UPS ~20%, FedEx ~14%, others ~10%.[9] The newer twist is USPS monetizing its last-mile network (a 2026 bid platform for outside access, plus an exclusive DHL eCommerce last-mile deal), while Postal Realty Trust quietly rolls up scattered post-office landlords.[5][14][15] See the 491110 primer, §8.

9. Risks

The same risk stack as the child, unchanged by the rollup: (1) structural decline in the profitable letter product with no floor; (2) a liquidity cliff — ~$8.2 billion cash, about one month of expenses, no borrowing room under a frozen $15 billion Treasury debt cap, against ~$9 billion annual losses; (3) turnaround execution risk on the 10-year "Delivering for America" plan; (4) political and governance risk, including leadership churn and active talk of privatization — the tail risk for any USPS-linked position (notably PSTL, whose sole dominant tenant could be restructured or shrunk); (5) rate-cap regulation by design; and (6) package competition and Amazon insourcing threatening the one growth lane.[1][6][8][9][10][14] Full detail in the 491110 primer, §9.

10. How to invest and outlook

There is no separate 49111 investment case — it is the 491110 case. In brief: public routes are few and indirect (Postal Realty Trust as the only listed pure-play; parcel carriers UPS/FDX/DHL and mailing infrastructure PBI/QUAD/AMZN as adjacent bets in different NAICS codes; no USPS securities exist), and private routes include post-office real estate, postal contract businesses (the population the $9 million SBA size standard is written for), and regional carriers or shipping-software operators.[3][5][11] The base case is a durable-but-shrinking mail utility whose service is legally guaranteed to continue but whose structure, prices, and delivery standards are genuinely in play — with policy and structural uncertainty, more than mail volume itself, the real variable. For the full investable table, valuation angles, and outlook, read the 491110 primer, §10.

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Sources

Drawn from the child primer (491110); numbering matches it.

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. 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
3. U.S. Postal Service, "Size and Scope," Postal Facts, 2025. https://facts.usps.com/size-and-scope/
4. 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
5. 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
6. 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
7. 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
8. 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/
9. 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/
10. 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
11. U.S. Census Bureau, "2022 NAICS: 491110 Postal Service" (definition and adjacent codes). https://www.census.gov/naics/?details=491110&input=491110&year=2022
12. 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
13. Postal Regulatory Commission, "Who Sets Postal Rates?" (Market Dominant vs. Competitive; CPI-based cap). https://www.prc.gov/who-sets-postal-rates
14. 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
15. 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