| County Name | State | CEN70 | CEN80 | CEN90 | Variant Name or Note |
| Autauga | AL | 1001 | 1001 | 1001 | |
| Baldwin | AL | 1003 | 1003 | 1003 | |
| Barbour | AL | 1005 | 1005 | 1005 | |
| Bibb | AL | 1007 | 1007 | 1007 | |
| Blount | AL | 1009 | 1009 | 1009 | |
| Bullock | AL | 1011 | 1011 | 1011 | |
| Butler | AL | 1013 | 1013 | 1013 | |
| Calhoun | AL | 1015 | 1015 | 1015 | |
| Chambers | AL | 1017 | 1017 | 1017 | |
| Cherokee | AL | 1019 | 1019 | 1019 | |
| Chilton | AL | 1021 | 1021 | 1021 | |
| Choctaw | AL | 1023 | 1023 | 1023 | |
| Clarke | AL | 1025 | 1025 | 1025 | |
| Clay | AL | 1027 | 1027 | 1027 | |
| Cleburne | AL | 1029 | 1029 | 1029 | |
| Coffee | AL | 1031 | 1031 | 1031 | |
| Colbert | AL | 1033 | 1033 | 1033 | |
| Conecuh | AL | 1035 | 1035 | 1035 | |
| Coosa | AL | 1037 | 1037 | 1037 | |
| Covington | AL | 1039 | 1039 | 1039 | |
| Crenshaw | AL | 1041 | 1041 | 1041 | |
| Cullman | AL | 1043 | 1043 | 1043 | |
| Dale | AL | 1045 | 1045 | 1045 | |
| Dallas | AL | 1047 | 1047 | 1047 | |
| De Kalb | AL | 1049 | 1049 | 1049 | |
| Elmore | AL | 1051 | 1051 | 1051 | |
| Escambia | AL | 1053 | 1053 | 1053 | |
| Etowah | AL | 1055 | 1055 | 1055 | |
| Fayette | AL | 1057 | 1057 | 1057 | |
| Franklin | AL | 1059 | 1059 | 1059 | |
| Geneva | AL | 1061 | 1061 | 1061 | |
| Greene | AL | 1063 | 1063 | 1063 | |
| Hale | AL | 1065 | 1065 | 1065 | |
| Henry | AL | 1067 | 1067 | 1067 | |
| Houston | AL | 1069 | 1069 | 1069 | |
| Jackson | AL | 1071 | 1071 | 1071 | |
| Jefferson | AL | 1073 | 1073 | 1073 | |
| Lamar | AL | 1075 | 1075 | 1075 | |
| Lauderdale | AL | 1077 | 1077 | 1077 | |
| Lawrence | AL | 1079 | 1079 | 1079 | |
| Lee | AL | 1081 | 1081 | 1081 | |
| Limestone | AL | 1083 | 1083 | 1083 | |
| Lowndes | AL | 1085 | 1085 | 1085 | |
| Macon | AL | 1087 | 1087 | 1087 | |
| Madison | AL | 1089 | 1089 | 1089 | |
| Marengo | AL | 1091 | 1091 | 1091 | |
| Marion | AL | 1093 | 1093 | 1093 | |
| Marshall | AL | 1095 | 1095 | 1095 | |
| Mobile | AL | 1097 | 1097 | 1097 | |
| Monroe | AL | 1099 | 1099 | 1099 | |
| Montgomery | AL | 1101 | 1101 | 1101 | |
| Morgan | AL | 1103 | 1103 | 1103 | |
| Perry | AL | 1105 | 1105 | 1105 | |
| Pickens | AL | 1107 | 1107 | 1107 | |
| Pike | AL | 1109 | 1109 | 1109 | |
| Randolph | AL | 1111 | 1111 | 1111 | |
| Russell | AL | 1113 | 1113 | 1113 | |
| St. Clair | AL | 1115 | 1115 | 1115 | |
| Shelby | AL | 1117 | 1117 | 1117 | |
| Sumter | AL | 1119 | 1119 | 1119 | |
| Talladega | AL | 1121 | 1121 | 1121 | |
| Tallapoosa | AL | 1123 | 1123 | 1123 | |
| Tuscaloosa | AL | 1125 | 1125 | 1125 | |
| Walker | AL | 1127 | 1127 | 1127 | |
| Washington | AL | 1129 | 1129 | 1129 | |
| Wilcox | AL | 1131 | 1131 | 1131 | |
| Winston | AL | 1133 | 1133 | 1133 | |
| Aleutian Islands Census Area | AK | 2010 | 2010 | . | Aleutian Islands Division (1970) |
| Aleutians East Borough | AK | . | . | 2013 | |
| Aleutians West Census Area | AK | . | . | 2016 | |
| Anchorage Borough | AK | 2020 | 2020 | 2020 | Anchorage Division (1970) |
| Angoon Division | AK | 2030 | . | . | |
| Barrow-North Slope Division | AK | 2040 | . | . | |
| Bethel Census Area | AK | 2050 | 2050 | 2050 | Bethel Division (1970) |
| Bristol Bay Borough | AK | 2060 | 2060 | 2060 | |
| Dillingham Census Area | AK | 2070 | 2070 | 2070 | |
| Cordova-McCarthy Division | AK | 2080 | . | . | |
| Fairbanks North Star Borough | AK | 2090 | 2090 | 2090 | Fairbanks Division (1970) |
| Haines Borough | AK | 2100 | 2100 | 2100 | Haines Division (1970) |
| Juneau Borough | AK | 2110 | 2110 | 2110 | Juneau Division (1970) |
| Kenai-Cook Inlet Division | AK | 2120 | . | . | |
| Kenai Peninsula Borough | AK | . | 2122 | 2122 | |
| Ketchikan Gateway Borough | AK | 2130 | 2130 | 2130 | Ketchikan Division (1970) |
| Kobuk Division | AK | 2140 | 2140 | . | |
| Kodiak Island Borough | AK | 2150 | 2150 | 2150 | Kodiak Division (1970) |
| Kuskokwim Division | AK | 2160 | . | . | |
| Lake and Peninsula Borough | AK | . | . | 2164 | |
| Matanuska-Susitna Borough | AK | 2170 | 2170 | 2170 | Matanuska-Susitna Division (1970) |
| Nome Census Area | AK | 2180 | 2180 | 2180 | Nome Division (1970) |
| North Slope Borough | AK | . | 2185 | 2185 | |
| Northwest Arctic Borough | AK | . | . | 2188 | |
| Outer Ketchikan Division | AK | 2190 | . | . | |
| Prince of Wales Division | AK | 2200 | . | . | |
| Pr. of Wales-Outer Ketchikan C | AK | . | 2201 | 2201 | |
| Seward Division | AK | 2210 | . | . | |
| Sitka Borough | AK | 2220 | 2220 | 2220 | Sitka Division (1970) |
| Skagway-Yakutat Division | AK | 2230 | . | . | |
| Skagway-Yakutat-Angoon Census | AK | . | 2231 | 2231 | |
| Southeast Fairbanks Census Are | AK | 2240 | 2240 | 2240 | Southeast Fairbanks Division (1970) |
| Upper Yukon Division | AK | 2250 | . | . | |
| Valdez-Chitina-Whittier Divisi | AK | 2260 | . | . | |
| Valdez-Cordova Census Area | AK | . | 2261 | 2261 | |
| Wade Hampton Census Area | AK | 2270 | 2270 | 2270 | Wade Hampton Division (1970) |
| Wrangell-Petersburg Census Are | AK | 2280 | 2280 | 2280 | Wrangell-Petersburg Division (1970) |
| Yukon-Koyukuk Census Area | AK | 2290 | 2290 | 2290 | Yukon-Koyukuk Division (1970) |
| Apache | AZ | 4001 | 4001 | 4001 | |
| Cochise | AZ | 4003 | 4003 | 4003 | |
| Coconino | AZ | 4005 | 4005 | 4005 | |
| Gila | AZ | 4007 | 4007 | 4007 | |
| Graham | AZ | 4009 | 4009 | 4009 | |
| Greenlee | AZ | 4011 | 4011 | 4011 | |
| La Paz | AZ | . | . | 4012 | Formed from Yuma |
| Maricopa | AZ | 4013 | 4013 | 4013 | |
| Mohave | AZ | 4015 | 4015 | 4015 | |
| Navajo | AZ | 4017 | 4017 | 4017 | |
| Pima | AZ | 4019 | 4019 | 4019 | |
| Pinal | AZ | 4021 | 4021 | 4021 | |
| Santa Cruz | AZ | 4023 | 4023 | 4023 | |
| Yavapai | AZ | 4025 | 4025 | 4025 | |
| Yuma | AZ | 4027 | 4027 | 4027 | La Paz split off after 1980 |
| Arkansas | AR | 5001 | 5001 | 5001 | |
| Ashley | AR | 5003 | 5003 | 5003 | |
| Baxter | AR | 5005 | 5005 | 5005 | |
| Benton | AR | 5007 | 5007 | 5007 | |
| Boone | AR | 5009 | 5009 | 5009 | |
| Bradley | AR | 5011 | 5011 | 5011 | |
| Calhoun | AR | 5013 | 5013 | 5013 | |
| Carroll | AR | 5015 | 5015 | 5015 | |
| Chicot | AR | 5017 | 5017 | 5017 | |
| Clark | AR | 5019 | 5019 | 5019 | |
| Clay | AR | 5021 | 5021 | 5021 | |
| Cleburne | AR | 5023 | 5023 | 5023 | |
| Cleveland | AR | 5025 | 5025 | 5025 | |
| Columbia | AR | 5027 | 5027 | 5027 | |
| Conway | AR | 5029 | 5029 | 5029 | |
| Craighead | AR | 5031 | 5031 | 5031 | |
| Crawford | AR | 5033 | 5033 | 5033 | |
| Crittenden | AR | 5035 | 5035 | 5035 | |
| Cross | AR | 5037 | 5037 | 5037 | |
| Dallas | AR | 5039 | 5039 | 5039 | |
| Desha | AR | 5041 | 5041 | 5041 | |
| Drew | AR | 5043 | 5043 | 5043 | |
| Faulkner | AR | 5045 | 5045 | 5045 | |
| Franklin | AR | 5047 | 5047 | 5047 | |
| Fulton | AR | 5049 | 5049 | 5049 | |
| Garland | AR | 5051 | 5051 | 5051 | |
| Grant | AR | 5053 | 5053 | 5053 | |
| Greene | AR | 5055 | 5055 | 5055 | |
| Hempstead | AR | 5057 | 5057 | 5057 | |
| Hot Spring | AR | 5059 | 5059 | 5059 | |
| Howard | AR | 5061 | 5061 | 5061 | |
| Independence | AR | 5063 | 5063 | 5063 | |
| Izard | AR | 5065 | 5065 | 5065 | |
| Jackson | AR | 5067 | 5067 | 5067 | |
| Jefferson | AR | 5069 | 5069 | 5069 | |
| Johnson | AR | 5071 | 5071 | 5071 | |
| Lafayette | AR | 5073 | 5073 | 5073 | |
| Lawrence | AR | 5075 | 5075 | 5075 | |
| Lee | AR | 5077 | 5077 | 5077 | |
| Lincoln | AR | 5079 | 5079 | 5079 | |
| Little River | AR | 5081 | 5081 | 5081 | |
| Logan | AR | 5083 | 5083 | 5083 | |
| Lonoke | AR | 5085 | 5085 | 5085 | |
| Madison | AR | 5087 | 5087 | 5087 | |
| Marion | AR | 5089 | 5089 | 5089 | |
| Miller | AR | 5091 | 5091 | 5091 | |
| Mississippi | AR | 5093 | 5093 | 5093 | |
| Monroe | AR | 5095 | 5095 | 5095 | |
| Montgomery | AR | 5097 | 5097 | 5097 | |
| Nevada | AR | 5099 | 5099 | 5099 | |
| Newton | AR | 5101 | 5101 | 5101 | |
| Ouachita | AR | 5103 | 5103 | 5103 | |
| Perry | AR | 5105 | 5105 | 5105 | |
| Phillips | AR | 5107 | 5107 | 5107 | |
| Pike | AR | 5109 | 5109 | 5109 | |
| Poinsett | AR | 5111 | 5111 | 5111 | |
| Polk | AR | 5113 | 5113 | 5113 | |
| Pope | AR | 5115 | 5115 | 5115 | |
| Prairie | AR | 5117 | 5117 | 5117 | |
| Pulaski | AR | 5119 | 5119 | 5119 | |
| Randolph | AR | 5121 | 5121 | 5121 | |
| St. Francis | AR | 5123 | 5123 | 5123 | |
| Saline | AR | 5125 | 5125 | 5125 | |
| Scott | AR | 5127 | 5127 | 5127 | |
| Searcy | AR | 5129 | 5129 | 5129 | |
| Sebastian | AR | 5131 | 5131 | 5131 | |
| Sevier | AR | 5133 | 5133 | 5133 | |
| Sharp | AR | 5135 | 5135 | 5135 | |
| Stone | AR | 5137 | 5137 | 5137 | |
| Union | AR | 5139 | 5139 | 5139 | |
| Van Buren | AR | 5141 | 5141 | 5141 | |
| Washington | AR | 5143 | 5143 | 5143 | |
| White | AR | 5145 | 5145 | 5145 | |
| Woodruff | AR | 5147 | 5147 | 5147 | |
| Yell | AR | 5149 | 5149 | 5149 | |
| Alameda | CA | 6001 | 6001 | 6001 | |
| Alpine | CA | 6003 | 6003 | 6003 | |
| Amador | CA | 6005 | 6005 | 6005 | |
| Butte | CA | 6007 | 6007 | 6007 | |
| Calaveras | CA | 6009 | 6009 | 6009 | |
| Colusa | CA | 6011 | 6011 | 6011 | |
| Contra Costa | CA | 6013 | 6013 | 6013 | |
| Del Norte | CA | 6015 | 6015 | 6015 | |
| El Dorado | CA | 6017 | 6017 | 6017 | |
| Fresno | CA | 6019 | 6019 | 6019 | |
| Glenn | CA | 6021 | 6021 | 6021 | |
| Humboldt | CA | 6023 | 6023 | 6023 | |
| Imperial | CA | 6025 | 6025 | 6025 | |
| Inyo | CA | 6027 | 6027 | 6027 | |
| Kern | CA | 6029 | 6029 | 6029 | |
| Kings | CA | 6031 | 6031 | 6031 | |
| Lake | CA | 6033 | 6033 | 6033 | |
| Lassen | CA | 6035 | 6035 | 6035 | |
| Los Angeles | CA | 6037 | 6037 | 6037 | |
| Madera | CA | 6039 | 6039 | 6039 | |
| Marin | CA | 6041 | 6041 | 6041 | |
| Mariposa | CA | 6043 | 6043 | 6043 | |
| Mendocino | CA | 6045 | 6045 | 6045 | |
| Merced | CA | 6047 | 6047 | 6047 | |
| Modoc | CA | 6049 | 6049 | 6049 | |
| Mono | CA | 6051 | 6051 | 6051 | |
| Monterey | CA | 6053 | 6053 | 6053 | |
| Napa | CA | 6055 | 6055 | 6055 | |
| Nevada | CA | 6057 | 6057 | 6057 | |
| Orange | CA | 6059 | 6059 | 6059 | |
| Placer | CA | 6061 | 6061 | 6061 | |
| Plumas | CA | 6063 | 6063 | 6063 | |
| Riverside | CA | 6065 | 6065 | 6065 | |
| Sacramento | CA | 6067 | 6067 | 6067 | |
| San Benito | CA | 6069 | 6069 | 6069 | |
| San Bernardino | CA | 6071 | 6071 | 6071 | |
| San Diego | CA | 6073 | 6073 | 6073 | |
| San Francisco | CA | 6075 | 6075 | 6075 | |
| San Joaquin | CA | 6077 | 6077 | 6077 | |
| San Luis Obispo | CA | 6079 | 6079 | 6079 | |
| San Mateo | CA | 6081 | 6081 | 6081 | |
| Santa Barbara | CA | 6083 | 6083 | 6083 | |
| Santa Clara | CA | 6085 | 6085 | 6085 | |
| Santa Cruz | CA | 6087 | 6087 | 6087 | |
| Shasta | CA | 6089 | 6089 | 6089 | |
| Sierra | CA | 6091 | 6091 | 6091 | |
| Siskiyou | CA | 6093 | 6093 | 6093 | |
| Solano | CA | 6095 | 6095 | 6095 | |
| Sonoma | CA | 6097 | 6097 | 6097 | |
| Stanislaus | CA | 6099 | 6099 | 6099 | |
| Sutter | CA | 6101 | 6101 | 6101 | |
| Tehama | CA | 6103 | 6103 | 6103 | |
| Trinity | CA | 6105 | 6105 | 6105 | |
| Tulare | CA | 6107 | 6107 | 6107 | |
| Tuolumne | CA | 6109 | 6109 | 6109 | |
| Ventura | CA | 6111 | 6111 | 6111 | |
| Yolo | CA | 6113 | 6113 | 6113 | |
| Yuba | CA | 6115 | 6115 | 6115 | |
| Adams | CO | 8001 | 8001 | 8001 | |
| Alamosa | CO | 8003 | 8003 | 8003 | |
| Arapahoe | CO | 8005 | 8005 | 8005 | |
| Archuleta | CO | 8007 | 8007 | 8007 | |
| Baca | CO | 8009 | 8009 | 8009 | |
| Bent | CO | 8011 | 8011 | 8011 | |
| Boulder | CO | 8013 | 8013 | 8013 | |
| Chaffee | CO | 8015 | 8015 | 8015 | |
| Cheyenne | CO | 8017 | 8017 | 8017 | |
| Clear Creek | CO | 8019 | 8019 | 8019 | |
| Conejos | CO | 8021 | 8021 | 8021 | |
| Costilla | CO | 8023 | 8023 | 8023 | |
| Crowley | CO | 8025 | 8025 | 8025 | |
| Custer | CO | 8027 | 8027 | 8027 | |
| Delta | CO | 8029 | 8029 | 8029 | |
| Denver | CO | 8031 | 8031 | 8031 | |
| Dolores | CO | 8033 | 8033 | 8033 | |
| Douglas | CO | 8035 | 8035 | 8035 | |
| Eagle | CO | 8037 | 8037 | 8037 | |
| Elbert | CO | 8039 | 8039 | 8039 | |
| El Paso | CO | 8041 | 8041 | 8041 | |
| Fremont | CO | 8043 | 8043 | 8043 | |
| Garfield | CO | 8045 | 8045 | 8045 | |
| Gilpin | CO | 8047 | 8047 | 8047 | |
| Grand | CO | 8049 | 8049 | 8049 | |
| Gunnison | CO | 8051 | 8051 | 8051 | |
| Hinsdale | CO | 8053 | 8053 | 8053 | |
| Huerfano | CO | 8055 | 8055 | 8055 | |
| Jackson | CO | 8057 | 8057 | 8057 | |
| Jefferson | CO | 8059 | 8059 | 8059 | |
| Kiowa | CO | 8061 | 8061 | 8061 | |
| Kit Carson | CO | 8063 | 8063 | 8063 | |
| Lake | CO | 8065 | 8065 | 8065 | |
| La Plata | CO | 8067 | 8067 | 8067 | |
| Larimer | CO | 8069 | 8069 | 8069 | |
| Las Animas | CO | 8071 | 8071 | 8071 | |
| Lincoln | CO | 8073 | 8073 | 8073 | |
| Logan | CO | 8075 | 8075 | 8075 | |
| Mesa | CO | 8077 | 8077 | 8077 | |
| Mineral | CO | 8079 | 8079 | 8079 | |
| Moffat | CO | 8081 | 8081 | 8081 | |
| Montezuma | CO | 8083 | 8083 | 8083 | |
| Montrose | CO | 8085 | 8085 | 8085 | |
| Morgan | CO | 8087 | 8087 | 8087 | |
| Otero | CO | 8089 | 8089 | 8089 | |
| Ouray | CO | 8091 | 8091 | 8091 | |
| Park | CO | 8093 | 8093 | 8093 | |
| Phillips | CO | 8095 | 8095 | 8095 | |
| Pitkin | CO | 8097 | 8097 | 8097 | |
| Prowers | CO | 8099 | 8099 | 8099 | |
| Pueblo | CO | 8101 | 8101 | 8101 | |
| Rio Blanco | CO | 8103 | 8103 | 8103 | |
| Rio Grande | CO | 8105 | 8105 | 8105 | |
| Routt | CO | 8107 | 8107 | 8107 | |
| Saguache | CO | 8109 | 8109 | 8109 | |
| San Juan | CO | 8111 | 8111 | 8111 | |
| San Miguel | CO | 8113 | 8113 | 8113 | |
| Sedgwick | CO | 8115 | 8115 | 8115 | |
| Summit | CO | 8117 | 8117 | 8117 | |
| Teller | CO | 8119 | 8119 | 8119 | |
| Washington | CO | 8121 | 8121 | 8121 | |
| Weld | CO | 8123 | 8123 | 8123 | |
| Yuma | CO | 8125 | 8125 | 8125 | |
| Fairfield | CT | 9001 | 9001 | 9001 | |
| Hartford | CT | 9003 | 9003 | 9003 | |
| Litchfield | CT | 9005 | 9005 | 9005 | |
| Middlesex | CT | 9007 | 9007 | 9007 | |
| New Haven | CT | 9009 | 9009 | 9009 | |
| New London | CT | 9011 | 9011 | 9011 | |
| Tolland | CT | 9013 | 9013 | 9013 | |
| Windham | CT | 9015 | 9015 | 9015 | |
| Kent | DE | 10001 | 10001 | 10001 | |
| New Castle | DE | 10003 | 10003 | 10003 | |
| Sussex | DE | 10005 | 10005 | 10005 | |
| District of Columbia | DC | 11001 | 11001 | 11001 | |
| Alachua | FL | 12001 | 12001 | 12001 | |
| Baker | FL | 12003 | 12003 | 12003 | |
| Bay | FL | 12005 | 12005 | 12005 | |
| Bradford | FL | 12007 | 12007 | 12007 | |
| Brevard | FL | 12009 | 12009 | 12009 | |
| Broward | FL | 12011 | 12011 | 12011 | |
| Calhoun | FL | 12013 | 12013 | 12013 | |
| Charlotte | FL | 12015 | 12015 | 12015 | |
| Citrus | FL | 12017 | 12017 | 12017 | |
| Clay | FL | 12019 | 12019 | 12019 | |
| Collier | FL | 12021 | 12021 | 12021 | |
| Columbia | FL | 12023 | 12023 | 12023 | |
| Dade | FL | 12025 | 12025 | 12025 | |
| De Soto | FL | 12027 | 12027 | 12027 | |
| Dixie | FL | 12029 | 12029 | 12029 | |
| Duval | FL | 12031 | 12031 | 12031 | |
| Escambia | FL | 12033 | 12033 | 12033 | |
| Flagler | FL | 12035 | 12035 | 12035 | |
| Franklin | FL | 12037 | 12037 | 12037 | |
| Gadsden | FL | 12039 | 12039 | 12039 | |
| Gilchrist | FL | 12041 | 12041 | 12041 | |
| Glades | FL | 12043 | 12043 | 12043 | |
| Gulf | FL | 12045 | 12045 | 12045 | |
| Hamilton | FL | 12047 | 12047 | 12047 | |
| Hardee | FL | 12049 | 12049 | 12049 | |
| Hendry | FL | 12051 | 12051 | 12051 | |
| Hernando | FL | 12053 | 12053 | 12053 | |
| Highlands | FL | 12055 | 12055 | 12055 | |
| Hillsborough | FL | 12057 | 12057 | 12057 | |
| Holmes | FL |