NAICS 327310

Overview

The North American Industry Classification System (NAICS) is the federal standard for classifying business establishments to support the collection, analysis, and publication of U.S. economic statistics. Developed under the Office of Management and Budget in 1997 to replace SIC, NAICS is maintained jointly with Canada and Mexico to ensure cross-country comparability; the current structure is the 2022 vintage. ¹
NAICS 327310 — Cement Manufacturing — covers establishments primarily engaged in producing portland, natural, masonry, pozzolanic, and other hydraulic cements. Establishments may calcine earths or mine, quarry, manufacture, or purchase lime as part of cement manufacturing. Census provides cross-references that distinguish this industry from activities such as limestone mining, lime manufacturing, ready-mix concrete, and dry-mix concrete. ²

See also on G2X:

• G2X — NAICS 327310 overview: https://app.g2xchange.com/naics/327310
• G2X — NAICS 327320
• G2X — NAICS 327410

What this NAICS covers

• Production of portland cement. ²
• Production of natural cement. ²
• Production of masonry cement. ²
• Production of pozzolanic and other hydraulic cements. ²
• Calcination of earths as part of cement production processes. ²
• Integrated operations that mine/quarry inputs or produce/purchase lime in support of cement manufacturing. ²

Related NAICS and PSC codes

Type	Code	Descriptor
NAICS	327320	Ready-Mix Concrete Manufacturing; excluded from 327310 per Census cross-reference. 2
NAICS	327410	Lime Manufacturing; excluded from 327310. 2
NAICS	212312	Crushed and Broken Limestone Mining and Quarrying; mining activity classified outside 327310. 2
PSC	5610	Mineral Construction Materials, Bulk — includes cement. 3

2022 Economic Census context

• Manufacturing sector (NAICS 31–33), including 327310, is published for 2022 on a flow-release basis; summary tables are available on data.census.gov and via Census FTP. ⁴

Frequently asked questions

• What activities are included in NAICS 327310?
  Census defines it to include manufacturing portland, natural, masonry, pozzolanic, and other hydraulic cements, with establishments possibly calcining earths or obtaining lime through mining, quarrying, manufacture, or purchase. ²

• How does NAICS 327310 differ from 327320 Ready-Mix Concrete?
  Ready-mix concrete involves producing concrete delivered in a plastic, unhardened state and is classified in 327320; cement manufacturing is classified in 327310. ²

• Are limestone quarry operations part of 327310?
  No. Mining or quarrying limestone is classified in 212312. Cement plants may use quarried limestone, but the mining activity itself is outside 327310. ²

• Is dry-mix/bagged concrete included in 327310?
  No. Dry-mix concrete manufacturing is classified in 327999 (All Other Miscellaneous Nonmetallic Mineral Product Manufacturing), not in 327310. ²

• What is the current NAICS vintage for classification and where is it maintained?
  The current structure is NAICS 2022, maintained under OMB with coordination among the U.S., Canada, and Mexico; NAICS has been the federal statistical standard since 1997. ¹

Useful resources

• G2X — NAICS 327310 overview: https://app.g2xchange.com/naics/327310
• Census NAICS — Introduction, search tools, and 2022 structure. ¹
• Census — NAICS 327310 industry description and cross-references. ²
• Census — 2022 Economic Census, Manufacturing (NAICS 31–33) data tables. ⁴

References

1. U.S. Census Bureau — North American Industry Classification System (NAICS) main page and introduction. https://www.census.gov/naics/
2. U.S. Census Bureau — NAICS 2022 detail for 327310 Cement Manufacturing, including official cross-references. https://www.census.gov/naics/?input=327310&year=2022
3. General Services Administration — Product and Service Codes (PSC) Manual, April 2025; Group 56 Construction and Building Materials, PSC 5610 includes “Cement.” https://login.acquisition.gov/sites/default/files/manual/PSC%20Manual%20April%202025.pdf
4. U.S. Census Bureau — 2022 NAICS Sector 31–33 Manufacturing data tables (Economic Census). https://www.census.gov/data/tables/2022/econ/economic-census/naics-sector-31-33.html