- Geological Survey2,462
- Army Department2,363
- Fish and Wildlife Service2,173
- Education Office2,131
- Commerce Department1,933
- Engineers Corps (Army)1,804
- Executive Office of the President1,784
- General Services Administration1,780
- Civil Service Commission1,739
- General Accounting Office1,561
- Economic Opportunity Office1,557
- Defense Department1,421
- Federal Aviation Agency1,362
- Agricultural Research Service1,350
- Naval Research Office1,206
- Treasury Dept.1,182
- Business and Defense Services Administration1,137
- National Bureau of Standards971
- National Park Service970
- Transportation Dept.898