> 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/companies-in/washington-dc/architecture-and-planning/ # Architecture Firms in Washington, DC The bigger architecture firms headquartered in Washington, DC, with what they do, their sizes and how to reach their people. By Enrich.chat Editorial. Updated October 22, 2026. **Short answer:** Among the architecture firms counted in Washington, DC, the biggest by headcount range include Noma, Rtkl and Otj Architects. They are mostly very small: 80% have 50 or fewer employees. ## Which architecture firms are in Washington, DC? Among the companies whose public profile lists Architecture and Planning as their industry and Washington, DC as their headquarters, the biggest by headcount range include Noma, Rtkl, Otj Architects, Quinn Evans and Hickok Cole. Names link to a company profile where we have one. | Company | Employees | | --- | --- | | Noma | 10,001+ | | Rtkl | 1,001 to 5,000 | | Otj Architects | 201 to 500 | | Quinn Evans | 51 to 200 | | Hickok Cole | 51 to 200 | | Wdg | 51 to 200 | | Fox Architects | 51 to 200 | | Torti Gallas Partners | 51 to 200 | | Foursquare Itp | 51 to 200 | | Kgd Architecture Kishimoto.Gordon.Dalaya | 51 to 200 | | Kcct | 51 to 200 | | Shalom Baranes Associates | 51 to 200 | | Aia Dc Urban Design Committee Ud Dc | 51 to 200 | | Above Green | 11 to 50 | | Bitarchitects | 11 to 50 | | Skb Architecture & Design | 11 to 50 | | Sshape | 11 to 50 | | Collective Architecture | 11 to 50 | | 3dus | 11 to 50 | | Bonstra L Haresign Architects | 11 to 50 | | Studio Twenty Seven Architecture | 11 to 50 | | Sorg | 11 to 50 | | Hyl Architecture | 11 to 50 | | Cunningham Quill Architects | 11 to 50 | | Bell Architects, Pc | 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. ## What do architecture firms in Washington, DC do? Architecture and Planning is a broad label. The most common NAICS codes among them are 541310 (57%), 541410 (29%) and 561990 (14%). **Figure: What architecture firms in Washington do.** Bars for the share of counted architecture firms with each code: 541310 57%, 541410 29%, 561990 14%. *Share of counted architecture firms in Washington by their NAICS code.* [NAICS 541310](https://enrich.chat/naics/541310/)[NAICS 541410](https://enrich.chat/naics/541410/) ## How big are they? 80% of the architecture firms counted in Washington, DC 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 architecture firms in Washington.** Seven columns for the share of counted architecture firms in Washington in each employee range: 11 to 50 80%, 51 to 200 15%, 201 to 500 2%, 501 to 1,000 0%, 1,001 to 5,000 2%, 5,001 to 10,000 0%, 10,001+ 2%. *Share of counted architecture firms in Washington in each employee range.* ## How architecture firms compare - 80% of architecture firms in Washington have 50 or fewer employees, against 71% across other cities on this site. ## How do you reach the people at architecture firms in Washington, DC? The people to talk to are usually principals and operations 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 architecture firms in Washington, DC ``` ### 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 principals and operations leaders at architecture firms in Washington, DC, 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 Other industries in Washington, DC: [Nonprofit Organizations](https://enrich.chat/companies-in/washington-dc/non-profit-organizations/)[Consulting Firms](https://enrich.chat/companies-in/washington-dc/business-consulting-and-services/)[IT Services Companies](https://enrich.chat/companies-in/washington-dc/it-services-and-it-consulting/)[Real Estate Companies](https://enrich.chat/companies-in/washington-dc/real-estate/)[Software Companies](https://enrich.chat/companies-in/washington-dc/software-development/)[Hospitals and Health Care Organizations](https://enrich.chat/companies-in/washington-dc/hospitals-and-health-care/)[Law Firms](https://enrich.chat/companies-in/washington-dc/law-practice/)[Financial Services Companies](https://enrich.chat/companies-in/washington-dc/financial-services/)[Construction Companies](https://enrich.chat/companies-in/washington-dc/construction/)[Public Relations Firms](https://enrich.chat/companies-in/washington-dc/public-relations-and-communications-services/)[Advertising Agencies](https://enrich.chat/companies-in/washington-dc/advertising-services/)[Technology and Internet Companies](https://enrich.chat/companies-in/washington-dc/technology-information-and-internet/)[Legal Services Firms](https://enrich.chat/companies-in/washington-dc/legal-services/)[Education Organizations](https://enrich.chat/companies-in/washington-dc/education-administration-programs/)[Colleges and Universities](https://enrich.chat/companies-in/washington-dc/higher-education/)[Government Agencies](https://enrich.chat/companies-in/washington-dc/government-administration/)[Research Services Firms](https://enrich.chat/companies-in/washington-dc/research-services/)[Environmental Services Companies](https://enrich.chat/companies-in/washington-dc/environmental-services/)[Training and Coaching Firms](https://enrich.chat/companies-in/washington-dc/professional-training-and-coaching/)[All of Washington, DC](https://enrich.chat/companies-in/washington-dc/) Architecture Firms in other cities: [New York, NY](https://enrich.chat/companies-in/new-york-ny/architecture-and-planning/)[Los Angeles, CA](https://enrich.chat/companies-in/los-angeles-ca/architecture-and-planning/)[San Francisco, CA](https://enrich.chat/companies-in/san-francisco-ca/architecture-and-planning/)[Chicago, IL](https://enrich.chat/companies-in/chicago-il/architecture-and-planning/)[Seattle, WA](https://enrich.chat/companies-in/seattle-wa/architecture-and-planning/)[Denver, CO](https://enrich.chat/companies-in/denver-co/architecture-and-planning/)[Boston, MA](https://enrich.chat/companies-in/boston-ma/architecture-and-planning/)[San Diego, CA](https://enrich.chat/companies-in/san-diego-ca/architecture-and-planning/)[Dallas, TX](https://enrich.chat/companies-in/dallas-tx/architecture-and-planning/)[Philadelphia, PA](https://enrich.chat/companies-in/philadelphia-pa/architecture-and-planning/) ## Frequently asked questions ### Which are the biggest architecture firms in Washington, DC? Among those counted, they include Noma, Rtkl, Otj Architects, Quinn Evans and Hickok Cole, ranked by headcount range. ### How big are architecture firms in Washington, DC? 80% of those counted 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. ### Which companies count as architecture and planning? Companies whose public profile lists Architecture and Planning as their industry and whose headquarters are in Washington, DC. ## Try this prompt Find the people at architecture firms in Washington, DC ```text Use www.enrich.chat to find the principals and operations leaders at architecture firms in Washington, DC, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [Nonprofit Organizations in Washington, DC](https://enrich.chat/companies-in/washington-dc/non-profit-organizations/) - [Consulting Firms in Washington, DC](https://enrich.chat/companies-in/washington-dc/business-consulting-and-services/) - [IT Services Companies in Washington, DC](https://enrich.chat/companies-in/washington-dc/it-services-and-it-consulting/) - [Real Estate Companies in Washington, DC](https://enrich.chat/companies-in/washington-dc/real-estate/) - [Architecture Firms in New York](https://enrich.chat/companies-in/new-york-ny/architecture-and-planning/) - [Architecture Firms in Los Angeles](https://enrich.chat/companies-in/los-angeles-ca/architecture-and-planning/) - [Architecture Firms in San Francisco](https://enrich.chat/companies-in/san-francisco-ca/architecture-and-planning/) - [Architecture Firms in Chicago](https://enrich.chat/companies-in/chicago-il/architecture-and-planning/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)