These CTCSS's (PL's) may help you identify a Federal Agency. All known PL's are on this list, not all radio' have all of these subaudable tones. 67.0 U.S. Postal Service 69.3 71.9 Federal Aviation Administration 74.4 77.0 Department Of Energy 79.7 82.5 U.S. Postal Service 85.4 91.5 U.S. Postal Service 94.8 Bureau Of Land Management 94.8 Department Of Energy (Nest Teams) 97.4 U.S. Postal Service 100.0 Bureau Of Alcohol, Tobacco & Firearms 100.0 Bureau Of Indian Affairs 100.0 Civil Air Patrol "Nationwide Common" 100.0 Department Of Justice 100.0 Immigration & Naturalization Service 100.0 Internal Revenue Service 100.0 U.S. Customs 100.0 U.S. Postal Service 103.5 Army Corps of Engineers 103.5 Bureau Of Indian Affairs 103.5 Central Intelligence Agency 103.5 Department Of Agriculture 103.5 Federal Law Enforcement Training Center 103.5 Gsa Federal Supply Service 103.5 National Highway Traffic Administration 103.5 U.S. Marshals Service 103.5 U.S. Park Police 103.5 U.S. Postal Service (Atlanta) 103.5 U.S. Secret Service 107.2 Defense Protection Service 107.2 Department Of Agriculture 107.2 U.S. Capitol Police 107.2 U.S. Postal Service 110.9 Department Of Geological Survey 110.9 U.S. Postal Service 114.8 Environmental Protection Agency 114.8 U.S. Postal Service 118.8 Federal Emergency Management Agency 118.8 U.S. Capitol Police 123.0 Bureau Of Alcohol, Tobacco & Firearms 123.0 Bureau Of Indian Affairs 123.0 Department Of Veterans Affairs 123.0 Immigration & Naturalization Service 123.0 Institute Of Standards & Technology 123.0 Internal Revenue Service 123.0 IRS/DEA Shared Frequencies (Surveillance) 123.0 U.S. Customs 127.3 Agricultural Research Service 127.3 Bureau Of Export Administration 127.3 Department Of Commerce 127.3 Department Of Energy 127.3 Department Of Veterans Affairs 127.3 Federal Reserve Banking System 127.3 General Services Administration 127.3 Immigration & Naturalization Service 127.3 Nuclear Regulatory Commission 127.3 U.S. Air Force (ANG) (OSI) 127.3 U.S. Capitol Police 127.3 U.S. Marshals Service 127.3 U.S. Park Police 127.3 U.S. Supreme Court 131.8 Central Intelligence Agency 131.8 Federal Reserve Banking System 131.8 Internal Revenue Service 131.8 Internal Revenue Service 131.8 Walter Reed AMC Security 136.5 Federal Aviation Administration 136.5 U.S. Geological Survey 136.5 U.S. Marshals Service 136.5 U.S. Postal Service 141.3 U.S. Park Police 146.2 Department Of Veterans Affairs 146.2 Federal Aviation Administration 146.2 General Services Administration (Atlanta) 146.2 U.S. Air Force (ANG) 146.2 U.S. Capitol Police 146.2 U.S. Fish & Wildlife 146.2 U.S. Marshals Service 146.2 U.S. Park Police 151.4 Federal Law Enforcement Training Center 151.4 Immigration & Naturalization Service 151.4 Military 151.4 U.S. Air Force (ANG) 151.4 U.S. Department of State (Bureau Of Diplomatic Security) 156.7 Central Intelligence Agency 156.7 Drug Enforcement Agency 156.7 Federal Aviation Administration 156.7 Federal Bureau Of Investigation 156.7 Federal Executive Board 156.7 Internal Revenue Service 156.7 IRS/DEA Shared Frequencies (Surveillance) 156.7 National Marine Fisheries 156.7 U.S. Attorney 156.7 U.S. Capitol Police 156.7 U.S. Postal Service 159.8 162.2 162.5 167.9 Bureau Of Alcohol, Tobacco & Firearms 167.9 Bureau Of Alcohol, Tobacco & Firearms (OCDETF) 167.9 Bureau Of Indian Affairs 167.9 Department Of Energy (Nuclear Material Security) 167.9 Department Of Justice 167.9 Federal Bureau Of Investigation 167.9 Federal Emergency Management Agency 167.9 Health & Human Services 167.9 Immigration & Naturalization Service 167.9 U.S. Marshals Service 171.3 173.8 Federal Communications Commission 177.3 179.9 183.5 U.S. Air Force (ANG) 186.2 U.S. Marshals Service 189.9 192.8 Bureau Of Alcohol, Tobacco & Firearms 192.8 Federal Communications Commission 192.8 U.S. Marshals Service 199.5 203.5 U.S. Marshals Service 206.5 Immigration & Naturalization Service 206.5 National Security Agency 210.7 218.1 225.7 229.1 233.6 241.8 250.3 254.1