SIC Code 4311: United States Postal Service
The SIC code for United States Postal Service is 4311.
United States Postal Service establishments operate within the SIC 4311 classification, providing products and services as defined by the Standard Industrial Classification system.
United States Postal Service (SIC 4311) is part of SIC 431 — United States Postal Service, which contains 1 industries.
4311
SIC Code
49111
NAICS Equivalent
NAICS Equivalent
Corresponding NAICS Code
NAICS 2022 · Sector 48-49: Transportation and Warehousing
NAICS replaced SIC for US federal statistics in 1997. Browse all NAICS codes
SIC 1987
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Need the NAICS equivalent? convert a SIC code to NAICS using the mapping table — SIC 1987 four-digit industries paired with NAICS 2022 at the five-digit industry level, with coverage gaps stated.