> 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/236220/maryland/ # NAICS 236220 companies in Maryland Companies with NAICS code 236220 (Commercial and Institutional Building Construction) headquartered in Maryland, with their cities, sizes and SIC codes. By Enrich.chat Editorial. Updated October 22, 2026. **Short answer:** The biggest NAICS 236220 companies in Maryland by headcount range include The Donohoe Companies, C.A. Lindman and Curbio. NAICS 236220 is the code for Commercial and Institutional Building Construction. Among those counted, they are mostly very small: 70% have 50 or fewer employees. ## Which NAICS 236220 companies are in Maryland? The biggest by headcount range include The Donohoe Companies, C.A. Lindman, Curbio, Forrester Construction and Hamel Builders. NAICS 236220 is the code for Commercial and Institutional Building Construction. Names link to a company profile where we have one. | Company | City | Employees | | --- | --- | --- | | The Donohoe Companies | Bethesda | 1,001 to 5,000 | | C.A. Lindman | Jessup | 201 to 500 | | Curbio | Potomac | 51 to 200 | | Forrester Construction | Rockville | 51 to 200 | | Hamel Builders | Elkridge | 51 to 200 | | Continental Contractors | Annapolis | 51 to 200 | | Alliance Exterior Construction | Baltimore | 51 to 200 | | Goel Services | Landover | 51 to 200 | | Gradeline Construction | Middle River | 51 to 200 | | Team Cam | Linthicum Heights | 51 to 200 | | Rainbow Construction Corp Of Waldorf | Waldorf | 51 to 200 | | Marco Enterprises | Landover | 51 to 200 | | Js Intl | Silver Spring | 51 to 200 | | Tensile Structure Systems | Baltimore | 11 to 50 | | The Greenbench Companies | Gaithersburg | 11 to 50 | | Kane Construction | Gaithersburg | 11 to 50 | | Mackenzie Contracting | Lutherville | 11 to 50 | | May Construction Group | Chevy Chase | 11 to 50 | | Delmarva Veteran Builders | Salisbury | 11 to 50 | | Boulevard Contractors | Owings Mills | 11 to 50 | | Eastern Construction | Gaithersburg | 11 to 50 | | Paramount Construction | Rockville | 11 to 50 | | Cain Contracting | Columbia | 11 to 50 | | Guardian Realty | North Bethesda | 11 to 50 | | Gardiner & Adams General Contractors | Annapolis | 11 to 50 | 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. ## How big are they? 70% of the NAICS 236220 companies counted in Maryland have 50 or fewer employees, and the middle one is in the 11 to 50 range. Companies with fewer than 11 employees are not counted. **Figure: Size of NAICS 236220 companies in Maryland.** Seven columns for the share of counted NAICS 236220 companies in Maryland in each employee range: 11 to 50 70%, 51 to 200 26%, 201 to 500 2%, 501 to 1,000 0%, 1,001 to 5,000 2%, 5,001 to 10,000 0%, 10,001+ 0%. *Share of counted NAICS 236220 companies in Maryland in each employee range.* ## Which SIC codes do they carry? The older SIC system and NAICS do not line up one to one. These are the SIC codes seen most here. **Figure: SIC codes of NAICS 236220 companies in Maryland.** Bars for the share of counted NAICS 236220 companies in Maryland with each code: 1542 72%, 1522 9%, 1541 9%. *Share of counted NAICS 236220 companies in Maryland by their SIC code.* [SIC 1541](https://enrich.chat/sic/1541/) ## How do you reach the people at these Maryland companies? The people to talk to are usually owners, operations and procurement leaders. Build the list 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 236220 in Maryland ``` ### 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 236220 in Maryland, 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 About the code: [NAICS 236220: Commercial and Institutional Building Construction](https://enrich.chat/naics/236220/). About the place: [companies in Maryland](https://enrich.chat/companies-in/maryland/). NAICS 236220 in other states: [California](https://enrich.chat/naics/236220/california/)[Texas](https://enrich.chat/naics/236220/texas/)[Florida](https://enrich.chat/naics/236220/florida/)[New York](https://enrich.chat/naics/236220/new-york/)[Pennsylvania](https://enrich.chat/naics/236220/pennsylvania/)[Washington](https://enrich.chat/naics/236220/washington/)[North Carolina](https://enrich.chat/naics/236220/north-carolina/)[Virginia](https://enrich.chat/naics/236220/virginia/)[Illinois](https://enrich.chat/naics/236220/illinois/)[Georgia](https://enrich.chat/naics/236220/georgia/) Other NAICS codes in Maryland: [NAICS 541511: Custom Computer Programming Services](https://enrich.chat/naics/541511/maryland/)[NAICS 541512: Computer Systems Design Services](https://enrich.chat/naics/541512/maryland/)[NAICS 238990: All Other Specialty Trade Contractors](https://enrich.chat/naics/238990/maryland/) ## Frequently asked questions ### Which NAICS 236220 companies are in Maryland? The biggest by headcount range include The Donohoe Companies, C.A. Lindman, Curbio, Forrester Construction and Hamel Builders. The page lists 25 with links to their profiles where we have them. ### What is NAICS 236220? NAICS 236220 is the code for Commercial and Institutional Building Construction, in sector 23: Construction. ### Which cities in Maryland have the most? Baltimore (7%), Gaithersburg (7%) and Landover (7%) lead among the companies counted. ## Try this prompt Find the people at NAICS 236220 companies in Maryland ```text Use www.enrich.chat to find the owners, operations and procurement leaders at companies with NAICS code 236220 in Maryland, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [NAICS 236220 in California](https://enrich.chat/naics/236220/california/) - [NAICS 236220 in Texas](https://enrich.chat/naics/236220/texas/) - [NAICS 236220 in Florida](https://enrich.chat/naics/236220/florida/) - [NAICS 236220 in New York](https://enrich.chat/naics/236220/new-york/) - [NAICS 541511 in Maryland](https://enrich.chat/naics/541511/maryland/) - [NAICS 541512 in Maryland](https://enrich.chat/naics/541512/maryland/) - [NAICS 238990 in Maryland](https://enrich.chat/naics/238990/maryland/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)