NAICS Code 491: Postal Service
The NAICS code for Postal Service is 491.
Postal Service establishments collect, sort, and deliver letters, packages, and periodicals through universal service networks covering every US address. The US Postal Service dominates this subsector and provides critical last-mile delivery infrastructure for e-commerce and government communications.
Postal Service is a 3-digit subsector of the broader Transportation and Warehousing (NAICS 48-49) sector.
20,000
Total US Entities
1
Industry Groups
491
NAICS Code
Classification
Industry Groups (4-digit)
| NAICS Code | Industry Group Title | US Entities |
|---|---|---|
| 4911 | NAICS 4911 — Postal Service | 20,000 |
NAICS 2022
Search NAICS Codes
Browse
Other Subsectors in Transportation and Warehousing
NAICS 481 — Air Transportation5,071 entities
NAICS 482 — Rail Transportation2,609 entities
NAICS 483 — Water Transportation4,739 entities
NAICS 484 — Truck Transportation253,986 entities
NAICS 485 — Transit and Ground Passenger Transportation61,273 entities
NAICS 486 — Pipeline Transportation3,159 entities
NAICS 487 — Scenic and Sightseeing Transportation1,130 entities
NAICS 488 — Support Activities for Transportation242,080 entities
NAICS 492 — Couriers and Messengers80,000 entities
NAICS 493 — Warehousing and Storage34,114 entities
Working with legacy records? convert a NAICS code to SIC using the mapping table — NAICS 2022 at the five-digit industry level paired with SIC 1987 four-digit industries, with coverage gaps stated.