NAICS 327331

Overview

The North American Industry Classification System (NAICS) is the production‑oriented standard that U.S. federal statistical programs use to classify establishments for collecting, analyzing, and publishing economic data. Developed by the Economic Classification Policy Committee with Statistics Canada and Mexico’s INEGI and first implemented in 1997 under OMB, NAICS is revised on a roughly five‑year cycle; the current vintage is NAICS 2022. ¹
U.S. industry 327331 covers establishments primarily engaged in manufacturing concrete block and concrete brick. It sits within industry group 32733 (Concrete Pipe, Brick, and Block Manufacturing) in the Manufacturing sector and is distinct from concrete pipe and other concrete product manufacturing. ²

See also on G2X:

• G2X — NAICS 327331 overview
• G2X — NAICS 327332 Concrete Pipe Manufacturing
• G2X — NAICS 327390 Other Concrete Product Manufacturing

What this NAICS covers

• Manufacturing of concrete block. ²
• Manufacturing of concrete brick. ²
• Establishments whose primary activity is producing concrete block and brick as finished goods. ²
• Classification to Manufacturing is based on production processes (not installation work). ³
• Inclusion within the Concrete Product Manufacturing industry group 32733. ²

Related NAICS and PSC codes

Type	Code	Descriptor
NAICS	327331	Concrete Block and Brick Manufacturing
NAICS	327332	Concrete Pipe Manufacturing
NAICS	327390	Other Concrete Product Manufacturing
PSC	5620	Tile, Brick and Block

Source notes: NAICS definitions per U.S. Census Bureau; PSC class 5620 scope per the Product and Service Code Manual. ²

Boundary with adjacent codes (official exclusions)

• Concrete pipe products are classified under NAICS 327332; they are excluded from 327331. ²
• Concrete products other than block, brick, and pipe fall under NAICS 327390. ²
• Mixing and delivering ready‑mix concrete is NAICS 327320, not 327331. ²
• For purchasing, PSC 5620 covers “Tile, Brick and Block,” while PSC 5610 covers bulk mineral materials and excludes shaped block and brick. ⁴

Frequently asked questions

• What does NAICS 327331 include?
  It includes establishments primarily engaged in manufacturing concrete block and manufacturing concrete brick. The definition is limited to these outputs and does not extend to installation or to other concrete products. ²

• How is NAICS 327331 different from NAICS 327390?
  NAICS 327390 covers concrete products except block, brick, and pipe. In contrast, 327331 is only for block and brick; concrete pipe is in 327332. ²

• Which PSCs are commonly associated with federal purchases of concrete block or brick?
  PSC 5620 “Tile, Brick and Block” includes concrete building block and cinder block; PSC 5610 is for bulk mineral materials and excludes shaped block and brick. ⁴

• What is the current SBA small business size standard for NAICS 327331?
  SBA publishes the official size standards matched to each NAICS in its Table of Small Business Size Standards. Consult the table for the current threshold applicable to NAICS 327331. ⁵

• Has the NAICS vintage changed recently for manufacturing industries?
  Yes. NAICS 2022 is the current vintage used for the 2022 Economic Census; other federal statistical programs adopt new NAICS vintages on their own schedules. ³

Useful resources

• G2X — NAICS 327331
• Census NAICS page for industry group 32733 and U.S. industry 327331. ²
• Census guidance: Understanding NAICS for Economic Census users. ³
• SBA Table of Small Business Size Standards. ⁵
• GSA Product and Service Code (PSC) Manual (scope for PSC 5620 and related classes). ⁴

References

1. U.S. Census Bureau — NAICS Frequently Asked Questions (production‑oriented approach, 1997 adoption, revision cycle). https://www.census.gov/naics/faqs/faqs.html
2. U.S. Census Bureau — 2022 NAICS details for 327331: Concrete Block and Brick Manufacturing. https://www.census.gov/naics/?input=327331&year=2022&details=327331
3. U.S. Census Bureau — Understanding NAICS (Economic Census use; production orientation). https://www.census.gov/programs-surveys/economic-census/guidance/understanding-naics.html
4. General Services Administration — Product and Service Code (PSC) Manual. https://www.acquisition.gov/psc-manual
5. U.S. Small Business Administration — Table of Small Business Size Standards. https://www.sba.gov/federal-contracting/contracting-guide/size-standards