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.
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
| NAICS Code | 321991 |
|---|---|
| Industry Title | Manufactured Home (Mobile Home) Manufacturing |
| SBA Size Standard | 1,250 employees |
| IRS PBA Code | 321900 (rolled-up match) |
| Sectors Hierarchy | Sector 31-33 → 321 → 3219 |
| Source / Verified | US Census 2022 NAICS Manual / 2026-06-28 |
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)
Related Resources & Compliance Guides
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.
- 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.
Related Industries in 3219
Frequently Asked Questions (FAQ)
Is 321991 a valid 2022 NAICS code?
NAICS 321991 is 'Manufactured Home (Mobile Home) Manufacturing', a 2022 U.S. national industry under Sector 31-33 (Manufacturing); the SBA small-business size standard is 1,250 employees.
What is the SBA size standard for NAICS 321991?
The SBA small business size standard for NAICS 321991 is 1,250 employees (based on employees).
What is the legacy SIC code mapping for 321991?
NAICS code 321991 maps to the legacy 1987 SIC codes: 2451 - Mobile Homes.