| A 33.1 | General Counsel (1955-?) |
| I 21.1 | General Land Office (1849-1946) |
| W 28.1 | General Service Schools (1881-1947) |
| M 113.1 | General Staff (1947-1949) |
| W 2.1 | General Staff Corps (1903-1947) |
| GS 1.1 | General Supply Committee (1909-1910); |
| General Services Administration (1949- ) | |
| T 45.1 | General Supply Committee (1910-1933) |
| I 17.1 | Geographical and Geological Survey of the Rocky Mountain Region (1874-1879) |
| W 8.1 | Geographical Surveys West of 100th Meridian (1869-1884) |
| LC 5.1 | Geography and Map Division (1897- ) |
| I 18.1 | Geological and Geographical Survey of the Territories (1872- 1879) |
| I 19.1 | Geological Survey (1879- ) |
| W 46.1 | Gettysburg National Military Park Commission (1893-1922) |
| PrEx 30.2 | Global Change Research Program (2002- ) |
| GA 1.1 | Government Accountability Office (1921- ) |
| T 50.1 | Government Actuary (1919-1935) |
| GP 2.1 | Government Printing Office (Library) |
| GP 1.1 | Government Publishing Office (1860- ) |
| A 41.1 | Grain Futures Administration (1922-1936) |
| A 113.1 | Grain Inspection, Packers and Stockyards Administration (1994- ) |
| I 38.1 | Grazing Service (1939-1946) |
