> Enrich.chat gives AI agents verified work emails and mobiles. To use it from an agent, read https://enrich.chat/agents.md . This is the Markdown version of https://enrich.chat/naics/237990/ # NAICS code 237990: Other Heavy and Civil Engineering Construction The companies classified under NAICS 237990, where they are based, how big they are and how the code maps to SIC. By Enrich.chat Editorial. Updated October 22, 2026. **Short answer:** NAICS 237990 is the code for Other Heavy and Civil Engineering Construction, in sector 23: Construction. The companies counted under it are mostly small: 80% have 200 or fewer employees, and 62% are headquartered in the United States. ## What is NAICS 237990? NAICS 237990 is the code for Other Heavy and Civil Engineering Construction. It belongs to sector 23: Construction. NAICS, the North American Industry Classification System, is the standard U.S. government agencies use to sort businesses by what they mainly do, and each digit narrows the category. Most of the companies counted also carry SIC 1629, Heavy construction, in the older SIC system (85%). NAICS is a North American system, so companies outside the US, Canada and Mexico are placed in it by classification. - 50% of the companies counted have 50 or fewer employees, and the middle one is in the 51 to 200 range. - The largest group is headquartered in the United States (62%). Within the US, Texas is the biggest state (19%). - Most were founded in the 2010s (26%), then the 2000s (25%). **Figure: How NAICS 237990 is built.** The code 237990 split into its parts: sector 23, then subsector, industry group, NAICS industry and U.S. industry. *The six digits of NAICS 237990. Each digit narrows the category.* ## Which companies are classified under NAICS 237990? The biggest by headcount range include Modec, Gammon India, Patel Engineering, Pt. Meindo Elang Indah and Pt Timas Suplindo. Names link to a company profile where we have one. | Company | Headquarters | Employees | | --- | --- | --- | | Gammon India | Mumbai, India | 1,001 to 5,000 | | Patel Engineering | Mumbai, India | 1,001 to 5,000 | | Pt. Meindo Elang Indah | Dki Jakarta, Indonesia | 1,001 to 5,000 | | Pt Timas Suplindo | Jakarta, Indonesia | 1,001 to 5,000 | | [Vallourec](https://enrich.chat/company/vallourec/) | Houston, TX | 1,001 to 5,000 | | Weeks Marine | Cranford, NJ | 1,001 to 5,000 | | Arabian Industries Projects | Muscat, Oman | 1,001 to 5,000 | | Svevia | Stockholm, Sweden | 1,001 to 5,000 | | Service Electric | Chattanooga, TN | 1,001 to 5,000 | | John Paul Construction | Dublin, Ireland | 501 to 1,000 | | Nuberg Engineering | Noida, India | 501 to 1,000 | | Manson Construction | Seattle, WA | 501 to 1,000 | | Fast Engenharia E Montagens | Sao Paulo, Brazil | 501 to 1,000 | | [APM Terminals](https://enrich.chat/company/apm-terminals/) | Limon, Costa Rica | 501 to 1,000 | | Swank Construction | New Kensington, PA | 501 to 1,000 | | Indemand Industrial Services | Camden, AR | 501 to 1,000 | | Great Arrow Builders | Monaca, PA | 501 to 1,000 | | Exyte Central Europe | Beveren, Belgium | 501 to 1,000 | | Pt Total Persada Indonesia | Dki Jakarta Jakarta Barat, Indonesia | 501 to 1,000 | | Isc Projects | Pune, India | 201 to 500 | | Ess Modular | London, United Kingdom | 201 to 500 | | Advantec Global Innovations | Chilliwack, Canada | 201 to 500 | | Jay Cashman | Quincy, MA | 201 to 500 | | Scheuchzer | Bussigny, Switzerland | 201 to 500 | | Clark Bros | Fresno, CA | 201 to 500 | The table shows the 25 biggest by headcount range, with ties broken by audience size. The charts and percentages below cover every company counted for this page, not just these 25, and companies with fewer than 11 employees are not counted. Headquarters is the location on each company's public profile. ## Where are NAICS 237990 companies based? The largest groups are headquartered in the United States (62%), the United Kingdom (9%) and Australia (6%). **Figure: Where companies in NAICS 237990 are based.** Bars for the share of counted companies in NAICS 237990 headquartered in each country: United States 62%, United Kingdom 9%, Australia 6%, Canada 3%, Indonesia 3%, Ireland 2%, India 2%, Netherlands 2%. *Share of counted companies in NAICS 237990 by headquarters country.* Within the United States, Texas (19%), Florida (12%) and Colorado (5%) lead. **Figure: US headquarters of companies in NAICS 237990, by state.** A tile map of the United States shaded by the share of counted US companies in NAICS 237990 headquartered in each state. The largest are Texas 19%, Florida 12%, Colorado 5%. *Share of counted US companies in NAICS 237990 by headquarters state. The three largest states are outlined.* ## How big are the companies counted for NAICS 237990? 50% of them have 50 or fewer employees, and the middle one is in the 51 to 200 range. Companies with fewer than 11 employees are not counted. **Figure: Size of companies in NAICS 237990.** Seven columns for the share of counted companies in NAICS 237990 in each employee range: 11 to 50 50%, 51 to 200 31%, 201 to 500 10%, 501 to 1,000 5%, 1,001 to 5,000 4%, 5,001 to 10,000 0%, 10,001+ 0%. *Share of counted companies in NAICS 237990 in each employee range.* ## How old are NAICS 237990 companies? Most were founded in the 2010s (26%), then the 2000s (25%). **Figure: When companies in NAICS 237990 were founded.** Eight columns for the share of counted companies in NAICS 237990 founded in each era: Before 1960 10%, 1960s 3%, 1970s 7%, 1980s 12%, 1990s 14%, 2000s 25%, 2010s 26%, 2020s 3%. *Share of counted companies in NAICS 237990 by the era they were founded in, for the ones that list a founding year.* ## How NAICS 237990 compares - 50% of companies in NAICS 237990 have 50 or fewer employees, against 60% across all NAICS codes on this site. - Texas holds 19% of the US companies here, against 8% across all NAICS codes on this site. ## How do NAICS 237990 companies describe themselves? A code is assigned by classification, and a company does not choose its own, so the label a company uses for itself can differ. The most common labels here are Construction (68%), Oil and Gas (14%) and Civil Engineering (11%). **Figure: How companies in NAICS 237990 describe themselves.** Bars for the share of counted companies in NAICS 237990 that give each industry on their public profile: Construction 68%, Oil and Gas 14%, Civil Engineering 11%, Maritime Transportation 4%. *Share of counted companies in NAICS 237990 by the industry they list on their public profile.* ## NAICS 237990 and the SIC system NAICS replaced SIC in 1997, but the two do not line up one to one: companies filed under one NAICS code can carry several SIC codes. These are the ones seen most. | Code | Title | Share of counted | | --- | --- | --- | | SIC 1629 | Heavy construction | 85% | | SIC 8711 | Engineering services | 7% | ## Where NAICS codes come from NAICS is maintained by the U.S. Census Bureau with Canada and Mexico and revised every five years; the current edition is NAICS 2022. To check exactly what a code includes, search the [official NAICS index](https://www.census.gov/naics/) or read the Census Bureau's [guide to understanding NAICS](https://www.census.gov/programs-surveys/economic-census/year/2022/guidance/understanding-naics.html). Pick a code by what a company mostly does, not by who it sells to. ## How do you reach the people at NAICS 237990 companies? The people to talk to are usually owners, operations and procurement leaders. You can build the list from this code in three prompts to your AI agent. ### 1. Count them (free) Counting who matches never uses credits. ```text Use www.enrich.chat to count the companies with NAICS code 237990 (Other Heavy and Civil Engineering Construction) ``` ### 2. Find the people (5 credits per person) Name the roles you sell to. Each person returned is 5 credits, and name, title and company are included. ```text Use www.enrich.chat to find the owners, operations and procurement leaders at companies with NAICS code 237990, with their titles ``` ### 3. Get their work emails (10 credits each) An email is 10 credits only when one is found. Every email comes with a status: verified, catch-all or unknown. ```text Use www.enrich.chat to find the work emails for these people and tell me which ones are verified ``` ## More to explore Others in sector 23: [NAICS 238220: Plumbing, Heating, and Air-Conditioning](https://enrich.chat/naics/238220/)[NAICS 236220: Commercial and Institutional Building](https://enrich.chat/naics/236220/)[NAICS 238990: All Other Specialty Trade Contractors](https://enrich.chat/naics/238990/)[NAICS 236115: New Single-Family Housing Construction](https://enrich.chat/naics/236115/)[NAICS 238210: Electrical Contractors and Other Wiring](https://enrich.chat/naics/238210/)[NAICS 238160: Roofing Contractors](https://enrich.chat/naics/238160/)[NAICS 237310: Highway, Street, and Bridge Construction](https://enrich.chat/naics/237310/)[NAICS 237210: Land Subdivision](https://enrich.chat/naics/237210/) ## Frequently asked questions ### What is NAICS code 237990? NAICS 237990 is the code for Other Heavy and Civil Engineering Construction, in sector 23: Construction. ### What is the SIC code for NAICS 237990 (Other Heavy and Civil Engineering Construction)? 85% of the companies counted carry SIC 1629 (Heavy construction), but the two systems do not map one to one. ### Which companies are classified under NAICS 237990? The biggest by headcount range include Modec, Gammon India, Patel Engineering, Pt. Meindo Elang Indah and Pt Timas Suplindo. The page lists 25 with links to their profiles where we have them. ### Where are NAICS 237990 companies based? The largest groups are headquartered in the United States (62%), the United Kingdom (9%) and Australia (6%). ### How big are the companies in NAICS 237990? 50% have 50 or fewer employees, and the middle one is in the 51 to 200 range. Companies with fewer than 11 employees are not counted. ### Is NAICS 237990 the same as a SIC code? No. NAICS replaced SIC as the U.S. federal standard in 1997, and the two do not map one to one. The SIC code seen most among these companies is 1629. ## Try this prompt Find the people at NAICS 237990 companies ```text Use www.enrich.chat to find the owners, operations and procurement leaders at companies with NAICS code 237990, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)