NAICS Code 212311 — Dimension Stone Mining and Quarrying

National Industry in the official 2022 North American Industry Classification System (U.S. Census Bureau). It is one of 4 national industries under 21231 (Stone Mining and Quarrying).

Code	212311
Title	Dimension Stone Mining and Quarrying
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	500 employees

Official definition (2022 NAICS)

This U.S. industry comprises establishments primarily engaged in developing the mine site and/or mining or quarrying dimension stone (i.e., rough blocks and/or slabs of stone).

Cross-References.

Is a business under 212311 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 212311 qualifies as a small business if it does not exceed 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.

Where 212311 sits in the hierarchy

Level	Code	Title
Sector	21	Mining, Quarrying, and Oil and Gas Extraction
Subsector	212	Mining (except Oil and Gas)
Industry Group	2123	Nonmetallic Mineral Mining and Quarrying
NAICS Industry	21231	Stone Mining and Quarrying
National Industry	212311	Dimension Stone Mining and Quarrying

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
1411	Dimension Stone

Related National Industry codes

• 212312 — Crushed and Broken Limestone Mining and Quarrying
• 212313 — Crushed and Broken Granite Mining and Quarrying
• 212319 — Other Crushed and Broken Stone Mining and Quarrying

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.