- Geological Survey2,378
- Fish and Wildlife Service2,363
- Army Department2,257
- Education Office2,125
- Commerce Department1,921
- General Services Administration1,794
- Civil Service Commission1,741
- Engineers Corps (Army)1,711
- General Accounting Office1,538
- Federal Aviation Agency1,478
- Business and Defense Services Administration1,423
- Agricultural Research Service1,407
- Defense Department1,341
- Naval Research Office1,190
- Treasury Dept.1,156
- Agricultural Marketing Service1,053
- National Bureau of Standards978
- National Park Service922
- Interstate Commerce Commission897
- Smithsonian Institution886