321991 — Manufactured Home (Mobile Home) Manufacturing
Description
This U.S. industry comprises establishments primarily engaged in making manufactured homes (i.e., mobile homes) and nonresidential mobile buildings. Manufactured homes are designed to accept permanent water, sewer, and utility connections and although equipped with wheels, they are not intended for regular highway movement (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Exclusions & Cross-References
- Manufacturing prefabricated wood buildings not equipped with wheels--are classified in U.S. Industry
- 321992, Prefabricated Wood Building Manufacturing;
- Manufacturing travel trailers with self-contained facilities for storage of water and waste--are classified in
- U.S. Industry 336214, Travel Trailer and Camper Manufacturing; and
- Setting up manufactured homes (i.e., mobile homes) at the construction site--are classified in Industry
- 238990, All Other Specialty Trade Contractors.
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 2451 - Mobile Homes (via SIC1987:2451→NAICS1997:321991→2002:321991→2007:321991→2012:321991→2017:321991→2022:321991)
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 3220 — Woodworking Machines
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 321991 valid in 2022? ▾
Yes, 321991 is a valid 6-digit 2022 NAICS national industry code representing 'Manufactured Home (Mobile Home) Manufacturing' under Sector 31-33 in the official classification index.
What is the SBA size standard for NAICS code 321991? ▾
The Small Business Administration (SBA) has established a small business size standard of 1,250 employees for NAICS code 321991 (Manufactured Home (Mobile Home) Manufacturing), calculated based on employees.
What is the legacy SIC equivalent for NAICS 321991? ▾
According to official Census Bureau concordance tables, NAICS code 321991 (Manufactured Home (Mobile Home) Manufacturing) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 2451 - Mobile Homes.
Related Pages & Tools
Further regulatory reference links for NAICS code 321991:
- Sector 31-33 Directory Hub — List of related industries in the Manufacturing sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- NAICS 321991 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Manufactured Home (Mobile Home) Manufacturing).
- 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.