NAICS Code 491110 — Postal Service

National Industry in the official 2022 North American Industry Classification System (U.S. Census Bureau). It is the only national industry under 49111 (Postal Service).

Code	491110
Title	Postal Service
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	$9 million in average annual receipts

Official definition (2022 NAICS)

This industry comprises establishments primarily engaged in providing mail services under a universal service obligation. Mail services include the carriage of letters, printed matter, or mailable packages, including acceptance, collection, processing, and delivery. Due to the infrastructure requirements of providing mail service under a universal service obligation, postal service establishments often provide parcel and express delivery services in addition to the mail service. Establishments primarily engaged in performing one or more parts of the basic mail service, such as sorting, routing and/or delivery (except bulk transportation of mail) are included in this industry.

Is a business under 491110 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 491110 qualifies as a small business if it does not exceed $9 million in average annual receipts. Small-business status determines eligibility for federal set-aside contracts, SAM.gov certifications and SBA loan programs — receipts are averaged over the latest 5 fiscal years.

Where 491110 sits in the hierarchy

Level	Code	Title
Sector	48-49	Transportation and Warehousing
Subsector	491	Postal Service
Industry Group	4911	Postal Service
NAICS Industry	49111	Postal Service
National Industry	491110	Postal Service

Related SIC codes

Via the official U.S. Census concordance (1987 SIC ↔ NAICS), shown only where the industry definition is unchanged in NAICS 2022.

SIC code	Title
4311	United States Postal Service
7389	Business Services, Not Elsewhere Classified

Data: official 2022 NAICS structure, descriptions and Census concordances, U.S. Census Bureau — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.