NAICS 327999

Overview

The North American Industry Classification System (NAICS) is the framework federal statistical programs use to categorize U.S. business establishments so data can be collected, analyzed, and published consistently. Adopted by the Office of Management and Budget in 1997 and updated every five years, the latest revision is 2022; NAICS was designed to enhance comparability among the United States, Canada, and Mexico. ¹

NAICS 327999 designates U.S. establishments primarily engaged in manufacturing nonmetallic mineral products not classified elsewhere in subsector 327. It excludes pottery and ceramics; clay building materials and refractories; glass; cement; ready-mix concrete; concrete products; lime; gypsum products; abrasive products; cut stone; ground or treated minerals; and mineral wool. Census examples include dry mix concrete, stucco products, mica products, and synthetic stones. ²

See also on G2X:

• G2X — NAICS 327999 overview: https://app.g2xchange.com/naics/327999
• Related code: NAICS 327991
• Related code: NAICS 327992

What this NAICS covers

• Dry mix concrete manufacturing. ²
• Stucco and stucco product manufacturing. ²
• Mica products manufacturing (e.g., fabricated mica goods). ²
• Manufacturing synthetic stones for gemstones and industrial uses. ²
• Other nonmetallic mineral product manufacturing not elsewhere classified in NAICS 32711 through NAICS 32742 or NAICS 327910. ²

Related NAICS and PSC codes

Key exclusions and boundaries

Per Census cross-references, activities classified elsewhere include: pottery/ceramics/plumbing fixtures (NAICS 327110); clay building materials and refractories (NAICS 327120); glass and glass products (NAICS 327210); cement (NAICS 327310); ready-mix concrete (NAICS 327320); concrete products (NAICS 327390); lime (NAICS 327410); gypsum products (NAICS 327420); abrasives (NAICS 327910); cut stone (NAICS 327991); ground/treated minerals (NAICS 327992); and mineral wool (NAICS 327993). ²

Frequently asked questions

• What products are included in NAICS 327999?
  Examples the Census cites include dry mix concrete, stucco and stucco products, mica products, and synthetic stones for gem or industrial use. The category functions as a residual for nonmetallic mineral products not classified in specific 327 industries. ²

• How is NAICS 327999 distinguished from related manufacturing codes?
  Cut stone belongs in NAICS 327991; ground or treated minerals in NAICS 327992; mineral wool in NAICS 327993. Cement, ready-mix concrete, and concrete products are classified in NAICS 32731/NAICS 32732/NAICS 32739, not 327999. ²

• Are ready-mix and dry-mix concrete both in NAICS 327999?
  No. Ready-mix concrete (plastic, unhardened delivery) is in NAICS 327320. Dry mix concrete is an illustrative example within 327999, which covers bagged mixes and similar nonmetallic mineral products not elsewhere classified. ²

• Does NAICS 327999 include synthetic gemstone manufacturing?
  Yes. Manufacturing synthetic stones for gemstones or industrial applications is explicitly identified by Census in 327999. These products are distinct from cut natural stones (classified in NAICS 327991) and from abrasives or mineral wool, which are placed in other dedicated industries. ²

• What is the current NAICS vintage and when is it being implemented in Census data products?
  The current vintage is NAICS 2022. Census began publishing using 2022 NAICS with Economic Census 2022 releases and plans to complete transition of most ongoing programs by the end of calendar year 2027. Agencies may show mixed vintages during the transition period. ³

Useful resources

• Census NAICS description for 327999 and related 327 industries (Manufacturing sector pages). ²
• Census: Implementation of the 2022 NAICS (timeline and program adoption). ³
• 2022 Economic Census — Industry tables (by NAICS sector). ⁴
• 2022 NAICS descriptions (reference files for data products). ⁵

References

1. U.S. Census Bureau — About Industry: NAICS background and update cadence (OMB and 2022 revision). https://www.census.gov/topics/employment/industry-occupation/about/industry.html
2. U.S. Census Bureau — NAICS 2022 official code lookup for 327999 (definition, examples, cross-references). https://www.census.gov/naics/?input=327999&year=2022
3. U.S. Census Bureau — The Census Bureau’s Implementation of the 2022 NAICS (timeline and adoption). https://www.census.gov/library/reference/code-lists/naics/2022/implementation-timeline.html
4. U.S. Census Bureau — Economic Census by Industry (access to 2022 NAICS sector tables). https://www.census.gov/programs-surveys/economic-census/data/tables/industry.html
5. U.S. Census Bureau — Nonemployer Statistics: Industry reference files (2022 NAICS descriptions). https://www.census.gov/programs-surveys/nonemployer-statistics/technical-documentation/reference/naics-descriptions.html