311221 — Wet Corn Milling and Starch Manufacturing
Description
This U.S. industry comprises establishments primarily engaged in wet milling corn and other vegetables (except to make ethyl alcohol). Examples of products made in these establishments are corn sweeteners, such as glucose, dextrose, and fructose; corn oil; and starches (except laundry) (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Exclusions & Cross-References
- Refining and/or blending corn oil from purchased oils--are classified in U.S. Industry 311225, Fats and Oils
- Refining and Blending;
- Manufacturing sweetening syrups from corn syrup and starch base dessert powders--are classified in U.S.
- Industry 311999, All Other Miscellaneous Food Manufacturing;
- Reducing maple sap to maple syrup--are classified in U.S. Industry 111998, All Other Miscellaneous Crop
- Farming;
- Milling (except wet milling) corn--are classified in U.S. Industry 311211, Flour Milling;
- Wet milling corn to produce nonpotable ethyl alcohol--are classified in U.S. Industry 325193, Ethyl
- Alcohol Manufacturing; and
- Manufacturing laundry starches--are classified in U.S. Industry 325612, Polish and Other Sanitation Good
- Manufacturing.
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 2046 - Wet Corn Milling (via SIC1987:2046→NAICS1997:311221→2002:311221→2007:311221→2012:311221→2017:311221→2022:311221)
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 M1GB — OPERATION OF FOOD OR GRAIN STORAGE BUILDINGS
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 311221 valid in 2022? ▾
Yes, 311221 is a valid 6-digit 2022 NAICS national industry code representing 'Wet Corn Milling and Starch Manufacturing' under Sector 31-33 in the official classification index.
What is the SBA size standard for NAICS code 311221? ▾
The Small Business Administration (SBA) has established a small business size standard of 1,300 employees for NAICS code 311221 (Wet Corn Milling and Starch Manufacturing), calculated based on employees.
What is the legacy SIC equivalent for NAICS 311221? ▾
According to official Census Bureau concordance tables, NAICS code 311221 (Wet Corn Milling and Starch Manufacturing) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 2046 - Wet Corn Milling.
Related Pages & Tools
Further regulatory reference links for NAICS code 311221:
- 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 311221 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Wet Corn Milling and Starch 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.