NAICS Code 324110 — Petroleum Refineries

National Industry in the official 2022 North American Industry Classification System (U.S. Census Bureau). It is the only national industry under 32411 (Petroleum Refineries).

Code	324110
Title	Petroleum Refineries
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	1,500 employees (SBA footnote 4)

Official definition (2022 NAICS)

This industry comprises establishments primarily engaged in refining crude petroleum into refined petroleum. Petroleum refining involves one or more of the following activities: (1) fractionation; (2) straight distillation of crude oil; and (3) cracking.

Is a business under 324110 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 324110 qualifies as a small business if it does not exceed 1,500 employees. Small-business status determines eligibility for federal set-aside contracts, SAM.gov certifications and SBA loan programs — employee count is averaged over the latest 24 months.

This industry is subject to SBA footnote 4, which may add exceptions or special measurement rules — check the official SBA size standards table for the full text.

Where 324110 sits in the hierarchy

Level	Code	Title
Sector	31-33	Manufacturing
Subsector	324	Petroleum and Coal Products Manufacturing
Industry Group	3241	Petroleum and Coal Products Manufacturing
NAICS Industry	32411	Petroleum Refineries
National Industry	324110	Petroleum Refineries

Related SIC codes

Via the official U.S. Census concordance (1987 SIC ↔ NAICS), shown only where the industry definition is unchanged in NAICS 2022.

SIC code	Title
2911	Petroleum Refining

Data: official 2022 NAICS structure, descriptions and Census concordances, U.S. Census Bureau — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.