| Agriculture Department | A | Arms Control and Disarmament Agency | AC |
| National Archives and Records Administration | AE | Commerce Department | C |
| Federal Communications Commission | CC | Civil Rights Commission | CR |
| Defense Department | D | Energy Department | E |
| Education Department | ED | Environmental Protection Agency | EP |
| Fine Arts Commission | FA | Fine Arts Commission | FCA |
| Federal Emergency Management Agency | FEM | Federal Housing Financing Board | FHF |
| Federal Maritime Commission | FMC | Federal Reserve System Board of Governors | FR |
| Federal Trade Commission | FT | Foreign-Trade Zones Board | FTZ |
| General Accounting Office | GA | Government Printing Office | GP |
| General Services Administration | GS | Health and Human Services Department | HE |
| Housing and Urban Development Department | HH | Interior Department | I |
| U.S. Information Agency | IA | Interstate Commerce Commission | IC |
| International Trade Commission | ITC | Justice Department | J |
| Judiciary | JU | Labor Department | L |
| Library of Congress | LC | National Labor Relations Board | LR |
| Merit Systems Protection Board | MS | National Aeronautics and Space Administration | NAS |
| National Capital Planning Commission | NC | National Credit Union Administration | NCU |
| National Foundation on the Arts and the Humanities | NF | National Mediation Board | NMB |
| National Science Foundation | NS | Overseas Private Investment Corporation | OP |
| United States Postal Service | P | Peace Corps | PE |
| Personnel Management Office | PM | President of the United States | PR |
| Executive Office of the President | PREX | Vice President of the United States | PRVP |
| Railroad Retirement Board" | RR | State Department | S |
| Small Business Administration | SBA | Securities and Exchange Commission | SE |
| Smithsonian Institution | SI | Social Security Administration | SSA |
| Treasury Department | T | Transportation Department" | TD |
| Veterans Affairs Department | VA | Congress | X |
| Congressional Publications | Y | | |