561431 — Private Mail Centers
Description
This U.S. industry comprises (1) establishments primarily engaged in providing mailbox rental and other postal and mailing (except direct mail advertising) services or (2) establishments engaged in providing these mailing services along with one or more other office support services, such as facsimile services, word processing services, on-site PC rental services, and office product sales (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Exclusions & Cross-References
- Operating contract post offices--are classified in Industry 491110, Postal Service;
- Delivering letters and parcels (except under a universal service obligation)--are classified in Subsector 492,
- Couriers and Messengers;
- Providing voice mailbox services--are classified in U.S. Industry 561421, Telephone Answering Services;
- Providing direct mail advertising services--are classified in Industry 541860, Direct Mail Advertising;
- Providing only one of the support services (e.g., word processing services) that establishments in this
- industry provide--are classified in the appropriate industry according to the service provided; and
- Providing full service office space, whether on a lease or service contract basis--are classified in Industry
- 531120, Lessors of Nonresidential Buildings (except Miniwarehouses).
Overview Facts
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 7389 - Business Services (via SIC1987:7389→NAICS1997:561431→2002:561431→2007:561431→2012:561431→2017:561431→2022:561431)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC R604 — Mailing and Distribution Services
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 561431 valid in 2022? ▾
Yes, 561431 is a valid 6-digit 2022 NAICS national industry code representing 'Private Mail Centers' under Sector 56 in the official classification index.
What is the SBA size standard for NAICS code 561431? ▾
The Small Business Administration (SBA) has established a small business size standard of $19,000,000 for NAICS code 561431 (Private Mail Centers), calculated based on receipts.
What is the legacy SIC equivalent for NAICS 561431? ▾
According to official Census Bureau concordance tables, NAICS code 561431 (Private Mail Centers) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 7389 - Business Services.
Related Pages & Tools
Further regulatory reference links for NAICS code 561431:
- Sector 56 Directory Hub — List of related industries in the Administrative and Support and Waste Management and Remediation Services sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- NAICS 561431 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Private Mail Centers).
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.