| United States Department of Health and Human Services |
52,285 |
| United States Department of Agriculture |
31,356 |
| United States Department of Energy |
12,330 |
| United States Air Force |
11,571 |
| United States National Forest Service |
9,805 |
| USDA Agricultural Research Service |
7,540 |
| Veterans Health Administration |
6,519 |
| United States Army |
5,994 |
| U.S. House of Representatives |
5,885 |
| United States Department of Veterans Affairs |
5,875 |
| United States Postal Service |
4,444 |
| US General Services Administration (GSA) |
4,328 |
| United States Environmental Protection Agency |
3,965 |
| United States Department of Justice |
3,417 |
| National Park Service |
3,280 |
| United States Department of Homeland Security |
3,088 |
| Federal Aviation Administration |
2,858 |
| United States Department of the Treasury |
2,598 |
| US Department of Transportation |
2,461 |
| US Department of Labor |
2,414 |
| United States Department of State |
2,198 |
| WilmerHale LLP |
2,046 |
| US Department of Housing and Urban Development |
2,008 |
| United States Department of the Interior |
1,959 |
| Federal Reserve System |
1,799 |
| Gallaudet University |
1,788 |
| US Small Business Administration |
1,710 |
| Georgetown University |
1,701 |
| United States Coast Guard |
1,637 |
| Hogan & Hartson LLP |
1,629 |
| United States Internal Revenue Service |
1,475 |
| Federal Bureau of Prisons |
1,465 |
| Federal Communications Commission |
1,425 |
| American Red Cross |
1,421 |
| United States Department of Education |
1,362 |
| U.S. Army Corps of Engineers |
1,355 |
| United States Marine Corps |
1,340 |
| Howard University Libraries |
1,322 |
| United States Department of Commerce |
1,310 |
| District of Columbia |
1,291 |
| Fannie Mae |
1,234 |
| American University |
1,233 |
| World Bank |
1,085 |
| US Senate |
1,084 |
| Akin Gump Strauss Hauer |
956 |
| Venable LLP |
940 |
| Smithsonian Institution |
939 |
| US Government Accountability Office |
933 |
| United States Fish and Wildlife Service |
928 |
| United States Agency for International Development |
896 |
| Patton Boggs LLP |
886 |
| George Washington University |
869 |
| Covington |
868 |
| The Washington Post |
827 |
| Arnold & Porter LLP |
810 |
| Howrey LLP |
765 |
| Association for the Advancement of Retired Persons |
705 |
| Steptoe & Johnson LLP |
665 |
| Veterans Benefits Administration |
636 |
| US Dept of Energy - Office of Info. Tech (User Services Center & Security Div) |
601 |
| Federal Deposit Insurance Corporation |
588 |
| XM Satellite Radio Holdings Inc. |
576 |
| Dickstein Shapiro LLP |
570 |
| United States Department of Defense |
563 |
| Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P. |
561 |
| McKenna Long & Aldridge LLP |
548 |
| Arent Fox LLP |
541 |
| United States Senate |
518 |
| The Catholic University of America |
506 |
| Crowell & Moring LLP |
501 |
| U.S. International Trade Commission |
494 |
| Dept. of Commerce Bureau of Economic Analysis |
490 |
| US Office of Personnel Management |
487 |
| Bureau of Reclamation |
484 |
| The Library of Congress |
471 |
| Inter-American Development Bank |
465 |
| United States Bureau of ATF |
461 |
| United States Department of Labor - Bureau of Labor Statistics |
453 |
| The Carlyle Group |
436 |
| Peace Corps |
421 |
| National Public Radio, Inc. |
410 |
| National Railroad Passenger Corporation (Amtrak) |
397 |
| National Education Association of The United States |
391 |
| Minerals Management Service |
389 |
| National Geographic Society |
383 |
| Financial Industry Regulatory Authority (FINRA) |
360 |
| Federal Emergency Management Agency |
344 |
| American Chemical Society |
342 |
| National Labor Relations Board |
340 |
| Pepco Holdings, Inc. |
336 |
| Hanley Wood, LLC |
336 |
| National Academy of Science |
335 |
| International Monetary Fund |
332 |
| U.S. Securities and Exchange Commission |
319 |
| TechAmerica |
316 |
| Federal Trade Commission |
310 |
| Blackboard Inc. |
305 |
| Agence France-Presse |
302 |
| Intelsat |
300 |
| Export-Import Bank of the United States |
287 |
| U.S. Government Printing Office (GPO) |
280 |
| United States Bureau of Indian Affairs |
280 |
| Cogent Communications Group, Inc. |
275 |
| Wiley Rein LLP |
270 |
| Federal Bureau of Investigation |
269 |
| GVA Advantis |
265 |
| Children's National Medical Center |
264 |
| Williams & Connolly |
262 |
| Gallup, Inc. |
262 |
| American Institutes for Research |
259 |
| EEOC |
257 |
| Court Services and Offender Supervision Agency |
257 |
| Saudi Arabia Cultural Mission |
251 |
| Overseas Private Investment Corporation |
249 |
| American Federation of Teachers |
246 |
| ASAE (American Society of Association Executives) |
239 |
| FMCS |
238 |
| Danaher Corporation |
238 |
| Armstrong Teasdale LLP |
232 |
| Federal Motor Carrier Safety |
231 |
| Federal Energy Regulatory Commission |
224 |
| American Bankers Association |
223 |
| Dow Lohnes PLLC |
222 |
| Corporation for National & Community Service |
215 |
| Federal Prison Industries, Inc. - UNICOR |
214 |
| Congressional Quarterly Inc. |
206 |
| Chamber of Commerce of The United States of America |
193 |
| Academy for Educational Development |
192 |
| Washington Times |
188 |
| National Journal Group Inc. |
188 |
| National Association of Home Builders |
188 |
| Commodity Futures Trading |
182 |
| National Endowment for the Humanities |
182 |
| World Resources Institute (WRI) |
179 |
| Washington Metropolitan Area Transit Authority |
179 |
| Federal Bureau of Investigation |
178 |
| American University Dubai |
177 |
| Paralyzed Veterans of America |
169 |
| Service Employees International Union |
169 |
| Pension Benefit Guaranty Corporation |
165 |
| Sughrue Mion, PLLC |
164 |
| American Psychological Association |
164 |
| District of Columbia Public Schools |
164 |
| National Endowment for the Arts |
162 |
| American Association for the Advancement of Science AAAS |
160 |
| Association of American Medical Colleges |
157 |
| Central Intelligence Agency (CIA) |
157 |
| APCO Worldwide Inc. |
157 |
| BET Inc |
155 |
| National Association of Manufacturers |
155 |
| US Office of the Secretary of Defense |
155 |
| Chemonics International, Inc. |
155 |
| American Public Works |
153 |
| YWCA of the U.S.A. |
153 |
| Ross, Dixon |
149 |
| Austrade |
148 |
| Trinity University - Washington, DC |
147 |
| American Federation of State, County and Municipal Employees, AFL-CIO |
146 |
| Mortgage Bankers Association |
146 |
| The Humane Society Of The United States |
142 |
| National Association for the Education of Young ChILDREN |
140 |
| The American Institute of Architects |
139 |
| ICMA Retirement Corporation |
139 |
| American Society of Interior Designers |
136 |
| American Public Transportation Association |
136 |
| National Cooperative Bank |
135 |
| National Telecommunications and Information Administration (NTIA) |
134 |
| Creative Associates International, Inc. |
125 |
| Brown Investment Advisory |
125 |
| Keller and Heckman LLP |
125 |
| ULLICO Inc. |
125 |
| Legal Services Corporation |
124 |
| The Brookings Institution |
124 |
| The Kiplinger Washington Editors, Inc. |
124 |
| AFL-CIO |
123 |
| Center for Applied Linguistics |
123 |
| Office of Surface Mining Reclamation and Enforcement |
120 |
| United States Institute of Peace |
119 |
| Voice Of America |
119 |
| National Association of Letter Carriers |
119 |
| U.S. News |
118 |
| Council for Advancement & Support of Education |
118 |
| Public Company Accounting Oversight Board |
117 |
| Communications Workers of America |
116 |
| Washington National Cathedral |
116 |
| Destination DC |
116 |
| Washington Gas |
114 |
| Association of Corporate Counsel |
113 |
| The Aspen Institute |
113 |
| American Farm Bureau |
112 |
| AOUSC |
112 |
| Atlantic Media |
112 |
| Visiting Nurse Associations of America |
110 |
| Chronicle of Higher Education |
109 |
| Beveridge & Diamond, P.C. |
109 |
| Independent Community Bankers of America |
109 |
| The National War College |
107 |
| National Retail Federation |
107 |
| dpa Deutsche Presse-Agentur GmbH |
107 |
| Edison Electric Institute |
106 |
