NAICS 327320

Overview

The North American Industry Classification System (NAICS) is the federal standard for grouping business establishments to enable consistent collection, analysis, and publication of U.S. economic statistics. Developed by the U.S. Office of Management and Budget with counterparts in Canada and Mexico, NAICS replaced SIC in 1997; the current U.S. vintage is 2022. ¹

NAICS 327320 covers establishments—such as batch or mix plants—primarily engaged in manufacturing concrete that is delivered to a purchaser in a plastic, unhardened state; these producers may mine, quarry, or purchase sand and gravel. This industry code is used across federal statistics and contracting to distinguish ready-mix production from cement making and downstream concrete product manufacturing. ²

See also on G2X:

• NAICS 238110 — Poured Concrete Foundation and Structure Contractors
• NAICS 327999 — All Other Miscellaneous Nonmetallic Mineral Product Manufacturing

What this NAICS covers

• Production of ready-mix concrete at dedicated batch or mix plants. ²
• Delivery of concrete to purchasers in plastic, unhardened condition for immediate use. ²
• Ready-mix operations that source aggregates by mining, quarrying, or purchasing sand and gravel. ²
• Industrial processes to proportion, batch, and mix cementitious materials with aggregates and water prior to delivery. ²
• Manufactured concrete mixtures intended for placement by the buyer (not packaged dry mix formulas). ²
• Establishments organized to manufacture ready-mix concrete as their primary activity, regardless of whether aggregate sourcing is integrated. ²

Related NAICS and PSC codes

Type	Code	Descriptor
NAICS	327310	Cement Manufacturing
NAICS	327331	Concrete Block and Brick Manufacturing
NAICS	327332	Concrete Pipe Manufacturing
PSC	5610	Mineral Construction Materials, Bulk

Placement within Census industry taxonomy

In Census employer category groupings, Ready-Mix Concrete Manufacturing appears in the Cement and Ready-Mix Concrete Manufacturing grouping alongside Cement Manufacturing, while separate groupings cover concrete products (block, pipe, other products). This clarifies its position within the broader nonmetallic mineral products domain. ⁶

Frequently asked questions

• What activities define NAICS 327320? Establishments primarily manufacture concrete at batch or mix plants and deliver it to customers while still plastic and unhardened. Aggregate may be mined, quarried, or purchased as part of operations. The defining feature is ready-mix production for immediate placement by the purchaser. ²

• What activities are outside this industry’s scope? Cement production and the manufacturing of concrete products such as pipe, brick, block, and other precast items are excluded. Packaged dry-mix formulations for retail sale are also excluded; those activities fall under other NAICS classifications per official cross-references. ²

• Does NAICS 327320 include delivery to job sites? Yes. The industry description explicitly covers manufacturing concrete “delivered to a purchaser in a plastic and unhardened state,” which generally involves delivery to construction sites using mixer trucks or similar conveyance. Delivery is integral to the ready-mix business model. ²

• Can a ready-mix producer under this code also extract aggregates? Yes. Establishments can mine, quarry, or purchase sand and gravel to support batching operations. The key determinant is that the primary activity is manufacturing and delivering ready-mixed concrete, not standalone aggregate extraction as the main business line. ²

• Where can current small business size standards for this code be found? The Small Business Administration publishes the official Table of Small Business Size Standards and an online size-standards tool. Refer to the current table to determine the applicable employee-based threshold for this manufacturing industry. ⁵

Useful resources

• U.S. Census Bureau — NAICS 327320 description and cross-references. ²
• GSA Acquisition — Product and Service Code (PSC) Manual (for construction materials PSCs). ³
• SBA — Table of Small Business Size Standards (latest official thresholds and methodology links). ⁵
• U.S. Census Bureau — 2022 NAICS Sector 31–33 Manufacturing data access. ⁴

References

1. U.S. Census Bureau — About industry coding; NAICS adoption, updates through 2022. https://www.census.gov/topics/employment/industry-occupation/about/industry.html
2. U.S. Census Bureau — 2022 NAICS Sector 31–33 archive page including 327320 description. https://www.census.gov/naics/resources/archives/sect31-33.html
3. General Services Administration — Product and Service Code (PSC) Manual, April 2025 (PDF). https://www.acquisition.gov/sites/default/files/manual/PSC%20Manual%20April%202025.pdf
4. U.S. Census Bureau — 2022 NAICS Sector 31–33 Manufacturing data resources. https://www.census.gov/data/tables/2022/econ/economic-census/naics-sector-31-33.html
5. U.S. Small Business Administration — Table of Small Business Size Standards (landing page with current table). https://www.sba.gov/document/support-table-size-standards
6. U.S. Census Bureau — Employer categories and corresponding establishment NAICS industries (placement of Cement and Ready-Mix group). https://www.census.gov/programs-surveys/esp/guidance/employer.html