There's a reason Amazon chose a suburb of the nation's capital for its HQ2. The city boasts a vibrant public transit system and a strong talent pipeline, courtesy of the ample area universities. One key institution, Virginia Tech, is expected to enroll the first class of master's degree students at its new Innovation Campus in the fall of 2020 (the outpost is slated to open fully in 2029). And while many of the area businesses largely cater to the government, opportunities to expand beyond the public sector are plentiful.

The 10 fastest-growing private companies in Washington, D.C., according to the annual Inc. 5000 list, are leading the way.

10. Clutch

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2019 Inc. 5000 rank No. 773 | Three-year growth 559% | 2018 revenue $8.1M

Clutch is a business-reviews site where you can search for more than 27,000 companies in around 500 categories, ranging from marketing and graphic design to software coding. CEO Mike Beares founded Clutch in 2013 as a way for business-service companies to market themselves online and rank higher in search results. Today, the company offers three different levels of access, from free to $18,000 per month, depending on factors like a company's size and its level of preferred visibility. The most popular option is the $100 a month premium level, which provides verified profiles and better access to customer support, among other things.

9. Steward Partners

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2019 Inc. 5000 rank No. 729 | Three-year growth 601% | 2018 revenue $66.6M

For the second consecutive year, Steward Partners landed on the Inc. 5000; last year it hit No. 544 with $37 million in 2017 revenue. The financial services firm offers wealth planning and investment strategy, asset management, and consulting expertise. Excluding its headquarters in Washington, D.C., the company has 20 offices across the U.S. 

8. GovernmentCIO

2019 Inc. 5000 rank No. 568 | Three-year growth 776% | 2018 revenue $70.7M

This veteran-owned IT and cybersecurity consulting firm has worked with many notable federal agencies, including the U.S. Department of Labor, NASA, and the Federal Trade Commission.  

7. Concourse Federal Group

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2019 Inc. 5000 rank No. 548 | Three-year growth 809% | 2018 revenue $10.7M

Concourse Federal Group offers architecture, engineering, real estate, technology, and management consulting. According to its website, the 10-year-old company has worked with 14 federal clients and completed 117 projects.

6. ProSource360 Consulting Services

2019 Inc. 5000 rank No. 515 | Three-year growth 850% | 2018 revenue $8.7M

This rapidly growing small business more than quadrupled its staff between 2015 and 2018. ProSource360, which was founded in 2011 by Ben Skyles, offers management consulting, IT services, and health care advising for health care companies and government organizations. The company has worked with clients like the Department of Defense, the National Institutes of Health, and the Centers for Disease Control.

5. Simple Technology Solutions

2019 Inc. 5000 rank No. 429 | Three-year growth 1,052% | 2018 revenue $5.2M

As its name suggests, Simple Technology Solutions aims to simplify difficult IT tasks for clients including the Transportation Security Administration and the Baltimore Police Department. The federal contractor offers cloud computing services as well as technology training to clients' employees. 

4.  Wireless Everywhere

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2019 Inc. 5000 rank No. 415 | Three-year growth 1,103% | 2018 revenue $2.8M

Founded in 2015 by Manny Dureja, Wireless Everywhere--which does business under the name Wave Wireless--installs indoor wireless networks for a range of customers. The company serves homeowners, public venues, health care companies, and government organizations.

3. UrbanStems

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2019 Inc. 5000 rank No. 385 | Three-year growth 1,192% | 2018 revenue $12.8M

This direct-to-consumer flower delivery service founded in 2014 by former college classmates Ajay Kori and Jeff Sheely offers sustainably sourced floral and plant arrangements. UrbanStems has grown to 100 employees in five different cities. It had just 19 employees in 2015.

2. Radius Networks

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2019 Inc. 5000 rank No. 216 | Three-year growth 1,915% | 2018 revenue $31.5M

Radius Networks' location-driven technology allows its grocery, restaurant, and retail clients to interact with customers wherever they are. With increased uptake in its order delivery, curbside pickup, messaging, and tracking services, the company has moved up 39 spots from its 2018 position on the Inc. 5000. Radius was founded by Marc Wallace in 2011.

1. Advoc8

2019 Inc. 5000 rank No. 199 | Three-year growth 2,027% | 2018 revenue $14.3M

This rapidly-growing company pitches itself as a one-stop-shop for content production and branding services. Advoc8 provides customers with creative design assistance, video content production, and swag creation. The company has worked with clients such as CNN, Google, and Uber.