In a city that holds a lot of political power, privately held companies work around the clock to support government operations--from staffing the lunchroom to keeping the office supplies flowing. The symbiotic relationship helps run our country and propelled 47 companies to lightning-fast revenue growth and a spot on the 2015 Inc. 5000.

Fast-growth consulting firms like Obsidian Analysis, Summit Consulting, and Analytica rely on government, intelligence agency, and national security clients. The last of the bunch is the fastest-growing company in D.C., with $8.8 million in 2014 revenue, up more than 4,000 percent since 2011.

Isom Global Strategies provides marketing and communication consulting to government clients--and business appears to be booming. The company reeled in more than 700 percent revenue growth in three years--reaching $5.2 million in 2014.  Barbaricum and VariQ design services help government agencies strengthen cybersecurity, leading to 800 and 400 percent growth rates respectively between 2011 and 2014. There's also the Bully Pulpit Interactive, which was founded by digital marketers from Barack Obama's campaign. It had revenue of $17.5 million in 2014, a nearly 700 percent hike since 2011.

Even for companies not focused on government clients, like Sol Systems, which facilitates financing for solar projects, Washington D.C.'s diverse culture and available capital make it a great place for new ventures. And the growing pool of business talent, cultivated by established companies like Capital One, LivingSocial, and Opower, fuels new businesses, like software and consulting firm Sanametrix, to success.
And for all those new professionals relocating in and around Washington, D.C., for a new venture or job at one of the below companies, No. 470 Zippy Shell delivers a moving container right to your front door. The eight-year-old company grew its sales nearly 1,000 percent over the past three years, to $7.4 million in 2014. 

10. Summit Consulting (No. 1,109)
9. Sol Systems (No. 934)
8. VariQ (No. 926)
7. Obsidian Analysis (No. 900)
6. Sanametrix (No. 779)
5. Bully Pulpit Interactive (No. 663)
4. Isom Global Strategies (No. 643)
3. Barbaricum (No. 539)
2. Zippy Shell (No. 470)
1. Analytica (No. 63)