| United States Department of Health and Human Services |
52,037 |
| United States Department of Agriculture |
31,018 |
| United States Department of Energy |
12,518 |
| United States Air Force |
11,579 |
| United States National Forest Service |
9,799 |
| U.S. House of Representatives |
7,539 |
| USDA Agricultural Research Service |
7,492 |
| Veterans Health Administration |
6,397 |
| United States Army |
5,994 |
| US Department of Veterans Affairs |
5,821 |
| United States Postal Service |
4,388 |
| US General Services Administration (GSA) |
4,295 |
| United States Environmental Protection Agency |
3,908 |
| United States Department of Justice |
3,519 |
| National Park Service |
3,270 |
| United States Department of Homeland Security |
2,899 |
| Federal Aviation Administration |
2,827 |
| United States Department of the Treasury |
2,577 |
| US Department of Transportation |
2,471 |
| US Department of Labor |
2,403 |
| United States Department of State |
2,173 |
| Gallaudet University |
2,096 |
| WilmerHale LLP |
2,036 |
| Housing and Urban Development |
1,994 |
| United States Department of the Interior |
1,916 |
| Federal Reserve System |
1,777 |
| US Small Business Administration |
1,698 |
| Georgetown University |
1,698 |
| United States Coast Guard |
1,637 |
| Hogan & Hartson LLP |
1,635 |
| U.S. Department of Education |
1,587 |
| US Senate |
1,464 |
| Federal Bureau of Prisons |
1,460 |
| American Red Cross |
1,441 |
| Federal Communications Commission |
1,414 |
| United States Internal Revenue Service |
1,399 |
| U.S. Army Corps of Engineers |
1,350 |
| United States Department of Commerce |
1,330 |
| United States Marine Corps |
1,319 |
| Howard University Libraries |
1,309 |
| District of Columbia |
1,281 |
| American University |
1,216 |
| Fannie Mae |
1,164 |
| World Bank |
1,018 |
| Akin Gump Strauss Hauer |
957 |
| Arnold & Porter LLP |
947 |
| Smithsonian Institution |
944 |
| Venable LLP |
941 |
| US Government Accountability Office |
927 |
| United States Fish and Wildlife Service |
926 |
| The Washington Post |
895 |
| United States Agency for International Development |
886 |
| Patton Boggs LLP |
883 |
| Covington |
868 |
| George Washington University |
855 |
| Howrey LLP |
770 |
| Association for the Advancement of Retired Persons |
682 |
| Steptoe |
670 |
| Crowell & Moring LLP |
648 |
| McKenna Long & Aldridge LLP |
644 |
| Veterans Benefits Administration |
624 |
| Arent Fox LLP |
622 |
| Federal Deposit Insurance Corporation |
611 |
| US Dept of Energy - Office of Info. Tech (User Services Center & Security Div) |
598 |
| Dickstein Shapiro LLP |
583 |
| Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P. |
558 |
| United States Department of Defense |
557 |
| XM Satellite Radio Holdings Inc. |
547 |
| United States Senate |
544 |
| The Catholic University of America |
503 |
| U.S. International Trade Commission |
490 |
| Dept. of Commerce Bureau of Economic Analysis |
489 |
| Bureau of Reclamation |
484 |
| US Office of Personnel Management |
474 |
| The Library of Congress |
466 |
| Inter-American Development Bank |
456 |
| United States Bureau of ATF |
455 |
| United States Department of Labor - Bureau of Labor Statistics |
450 |
| The Carlyle Group |
425 |
| Peace Corps |
419 |
| National Labor Relations Board |
405 |
| National Public Radio, Inc. |
397 |
| Minerals Management Service |
389 |
| International Monetary Fund |
381 |
| National Education Association of The United States |
373 |
| National Railroad Passenger Corporation (Amtrak) |
372 |
| National Geographic Society |
358 |
| American Chemical Society |
333 |
| National Academy of Science |
331 |
| Financial Industry Regulatory Authority (FINRA) |
328 |
| Pepco Holdings, Inc. |
324 |
| Williams & Connolly |
323 |
| Hanley Wood, LLC |
319 |
| Federal Emergency Management Agency |
316 |
| TechAmerica |
314 |
| U.S. Securities and Exchange Commission |
313 |
| Wiley Rein LLP |
311 |
| Federal Trade Commission |
306 |
| Blackboard Inc. |
303 |
| Intelsat |
299 |
| Export-Import Bank of the United States |
285 |
| American Bankers Association |
280 |
| Cogent Communications Group, Inc. |
279 |
| United States Bureau of Indian Affairs |
279 |
| U.S. Government Printing Office (GPO) |
278 |
| Armstrong Teasdale LLP |
264 |
| GVA Advantis |
264 |
| Children's National Medical Center |
263 |
| American Institutes for Research |
259 |
| EEOC |
253 |
| Gallup, Inc. |
252 |
| Court Services and Offender Supervision Agency |
251 |
| Saudi Arabia Cultural Mission |
251 |
| American Federation of Teachers |
245 |
| Overseas Private Investment Corporation |
245 |
| ASAE (American Society of Association Executives) |
238 |
| FMCS |
238 |
| Federal Motor Carrier Safety |
234 |
| Danaher Corporation |
231 |
| Federal Bureau of Investigation |
229 |
| Dow Lohnes PLLC |
228 |
| National Association of Home Builders |
225 |
| Washington Times |
223 |
| American Council on Education |
223 |
| Federal Prison Industries, Inc. - UNICOR |
220 |
| Federal Energy Regulatory Commission |
217 |
| Corporation for National & Community Service |
213 |
| Washington Metropolitan Area Transit Authority |
197 |
| APCO Worldwide Inc. |
193 |
| National Endowment for the Humanities |
191 |
| Congressional Quarterly Inc. |
190 |
| American Association for the Advancement of Science AAAS |
188 |
| Chamber of Commerce of The United States of America |
184 |
| Commodity Futures Trading |
182 |
| National Journal Group Inc. |
182 |
| Academy for Educational Development |
181 |
| Federal Bureau of Investigation |
179 |
| World Resources Institute (WRI) |
177 |
| American University Dubai |
177 |
| Association of American Medical Colleges |
175 |
| U.S. News |
173 |
| Paralyzed Veterans of America |
171 |
| The American Institute of Architects |
165 |
| Sughrue Mion, PLLC |
164 |
| American Psychological Association |
163 |
| District of Columbia Public Schools |
163 |
| Trinity University - Washington, DC |
162 |
| National Endowment for the Arts |
162 |
| US Office of the Secretary of Defense |
160 |
| Pension Benefit Guaranty Corporation |
160 |
| Agence France-Presse |
157 |
| BET Inc |
156 |
| Chemonics International, Inc. |
156 |
| National Association of Manufacturers |
153 |
| Central Intelligence Agency (CIA) |
153 |
| American Public Works |
152 |
| Austrade |
152 |
| Ross, Dixon |
149 |
| National Association for the Education of Young ChILDREN |
148 |
| American Federation of State, County and Municipal Employees, AFL-CIO |
144 |
| National Air Traffic Controllers Association |
142 |
| The Humane Society Of The United States |
141 |
| Mortgage Bankers Association |
140 |
| Beveridge & Diamond, P.C. |
139 |
| Center for Applied Linguistics |
139 |
| YWCA of the U.S.A. |
138 |
| Service Employees International Union |
136 |
| ICMA Retirement Corporation |
136 |
| American Public Transportation Association |
136 |
| United States Institute of Peace |
134 |
| American Farm Bureau |
132 |
| National Telecommunications and Information Administration (NTIA) |
132 |
| Brown Investment Advisory |
129 |
| Keller and Heckman LLP |
127 |
| ULLICO Inc. |
127 |
| American Petroleum Institute |
127 |
| Creative Associates International, Inc. |
126 |
| Council for Advancement & Support of Education |
126 |
| National Cooperative Bank |
125 |
| Legal Services Corporation |
124 |
| AFL-CIO |
123 |
| The National War College |
123 |
| Communications Workers of America |
122 |
| American Society of Interior Designers |
122 |
| The Brookings Institution |
121 |
| The Kiplinger Washington Editors, Inc. |
119 |
| FHFB |
119 |
| National Transportation Safety Board |
118 |
| National Retail Federation |
118 |
| National Association of Letter Carriers |
118 |
| Edison Electric Institute |
117 |
| Office of Surface Mining Reclamation and Enforcement |
117 |
| Miller & Chevalier |
115 |
| Washington National Cathedral |
115 |
| Destination DC |
115 |
| Chronicle of Higher Education |
112 |
| Voice Of America |
112 |
| US IRS |
112 |
| The Aspen Institute |
111 |
| Visiting Nurse Associations of America |
110 |
