NAICS Code 213111 — Drilling Oil and Gas Wells

National Industry in the official 2022 North American Industry Classification System (U.S. Census Bureau). It is one of 5 national industries under 21311 (Support Activities for Mining).

Code	213111
Title	Drilling Oil and Gas Wells
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	1,000 employees

Official definition (2022 NAICS)

This U.S. industry comprises establishments primarily engaged in drilling oil and gas wells for others on a contract or fee basis. This industry includes contractors that specialize in spudding in, drilling in, redrilling, and directional drilling.

Is a business under 213111 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 213111 qualifies as a small business if it does not exceed 1,000 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.

Where 213111 sits in the hierarchy

Level	Code	Title
Sector	21	Mining, Quarrying, and Oil and Gas Extraction
Subsector	213	Support Activities for Mining
Industry Group	2131	Support Activities for Mining
NAICS Industry	21311	Support Activities for Mining
National Industry	213111	Drilling Oil and Gas Wells

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
1381	Drilling Oil and Gas Wells

Related National Industry codes

• 213112 — Support Activities for Oil and Gas Operations
• 213113 — Support Activities for Coal Mining
• 213114 — Support Activities for Metal Mining
• 213115 — Support Activities for Nonmetallic Minerals (except Fuels) Mining

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.