Daftar county dan daerah setingkat county di Amerika Serikat
Tabel

| 17111 | McHenry County | Illinois | 307,409 | Chicago-Naperville-Elgin, IL-IN-WI Metropolitan Statistical Area | Chicago-Naperville, IL-IN-WI Combined Statistical Area |
| 17113 | McLean County | Illinois | 174,647 | Bloomington, IL Metropolitan Statistical Area | Bloomington-Pontiac, IL Combined Statistical Area |
| 17115 | Macon County | Illinois | 109,278 | Decatur, IL Metropolitan Statistical Area |  |
| 17117 | Macoupin County | Illinois | 46,880 | St. Louis, MO-IL Metropolitan Statistical Area | St. Louis-St. Charles-Farmington, MO-IL Combined Statistical Area |
| 17119 | Madison County | Illinois | 267,225 | St. Louis, MO-IL Metropolitan Statistical Area | St. Louis-St. Charles-Farmington, MO-IL Combined Statistical Area |
| 17121 | Marion County | Illinois | 38,622 | Centralia, IL Micropolitan Statistical Area | St. Louis-St. Charles-Farmington, MO-IL Combined Statistical Area |
| 17123 | Marshall County | Illinois | 12,153 | Peoria, IL Metropolitan Statistical Area | Peoria-Canton, IL Combined Statistical Area |
| 17125 | Mason County | Illinois | 14,248 |  |  |
| 17127 | Massac County | Illinois | 15,073 | Paducah, KY-IL Micropolitan Statistical Area | Paducah-Mayfield, KY-IL Combined Statistical Area |
| 17129 | Menard County | Illinois | 12,607 | Springfield, IL Metropolitan Statistical Area | Springfield-Jacksonville-Lincoln, IL Combined Statistical Area |
| 17131 | Mercer County | Illinois | 16,178 | Davenport-Moline-Rock Island, IA-IL Metropolitan Statistical Area | Davenport-Moline, IA-IL Combined Statistical Area |
| 17133 | Monroe County | Illinois | 33,493 | St. Louis, MO-IL Metropolitan Statistical Area | St. Louis-St. Charles-Farmington, MO-IL Combined Statistical Area |
| 17135 | Montgomery County | Illinois | 29,654 |  |  |
| 17137 | Morgan County | Illinois | 35,067 | Jacksonville, IL Micropolitan Statistical Area | Springfield-Jacksonville-Lincoln, IL Combined Statistical Area |
| 17139 | Moultrie County | Illinois | 14,876 |  |  |
| 17141 | Ogle County | Illinois | 52,385 | Rochelle, IL Micropolitan Statistical Area | Rockford-Freeport-Rochelle, IL Combined Statistical Area |
| 17143 | Peoria County | Illinois | 188,429 | Peoria, IL Metropolitan Statistical Area | Peoria-Canton, IL Combined Statistical Area |
| 17145 | Perry County | Illinois | 21,887 |  |  |
| 17147 | Piatt County | Illinois | 16,433 | Champaign-Urbana, IL Metropolitan Statistical Area |  |
| 17149 | Pike County | Illinois | 16,150 |  |  |
| 17151 | Pope County | Illinois | 4,312 |  |  |
| 17153 | Pulaski County | Illinois | 5,908 |  |  |
| 17155 | Putnam County | Illinois | 5,801 | Ottawa-Peru, IL Micropolitan Statistical Area | Chicago-Naperville, IL-IN-WI Combined Statistical Area |
| 17157 | Randolph County | Illinois | 32,890 |  |  |
| 17159 | Richland County | Illinois | 16,182 |  |  |
| 17161 | Rock Island County | Illinois | 147,258 | Davenport-Moline-Rock Island, IA-IL Metropolitan Statistical Area | Davenport-Moline, IA-IL Combined Statistical Area |
| 17163 | St. Clair County | Illinois | 266,955 | St. Louis, MO-IL Metropolitan Statistical Area | St. Louis-St. Charles-Farmington, MO-IL Combined Statistical Area |
| 17165 | Saline County | Illinois | 24,939 |  |  |
| 17167 | Sangamon County | Illinois | 199,145 | Springfield, IL Metropolitan Statistical Area | Springfield-Jacksonville-Lincoln, IL Combined Statistical Area |
| 17169 | Schuyler County | Illinois | 7,444 |  |  |
| 17171 | Scott County | Illinois | 5,222 | Jacksonville, IL Micropolitan Statistical Area | Springfield-Jacksonville-Lincoln, IL Combined Statistical Area |
| 17173 | Shelby County | Illinois | 22,119 |  |  |
| 17175 | Stark County | Illinois | 5,907 | Peoria, IL Metropolitan Statistical Area | Peoria-Canton, IL Combined Statistical Area |
| 17177 | Stephenson County | Illinois | 46,740 | Freeport, IL Micropolitan Statistical Area | Rockford-Freeport-Rochelle, IL Combined Statistical Area |
| 17179 | Tazewell County | Illinois | 136,352 | Peoria, IL Metropolitan Statistical Area | Peoria-Canton, IL Combined Statistical Area |
| 17181 | Union County | Illinois | 17,583 |  |  |
| 17183 | Vermilion County | Illinois | 80,329 | Danville, IL Metropolitan Statistical Area |  |
| 17185 | Wabash County | Illinois | 11,665 |  |  |
| 17187 | Warren County | Illinois | 17,726 |  |  |
| 17189 | Washington County | Illinois | 14,448 |  |  |
| 17191 | Wayne County | Illinois | 16,612 |  |  |
| 17193 | White County | Illinois | 14,549 |  |  |
| 17195 | Whiteside County | Illinois | 57,557 | Sterling, IL Micropolitan Statistical Area | Dixon-Sterling, IL Combined Statistical Area |
| 17197 | Will County | Illinois | 682,829 | Chicago-Naperville-Elgin, IL-IN-WI Metropolitan Statistical Area | Chicago-Naperville, IL-IN-WI Combined Statistical Area |
| 17199 | Williamson County | Illinois | 66,924 | Carbondale-Marion, IL Metropolitan Statistical Area |  |
| 17201 | Winnebago County | Illinois | 290,666 | Rockford, IL Metropolitan Statistical Area | Rockford-Freeport-Rochelle, IL Combined Statistical Area |
| 17203 | Woodford County | Illinois | 39,273 | Peoria, IL Metropolitan Statistical Area | Peoria-Canton, IL Combined Statistical Area |
| 18001 | Adams County | Indiana | 34,614 | Decatur, IN Micropolitan Statistical Area | Fort Wayne-Huntington-Auburn, IN Combined Statistical Area |
| 18003 | Allen County | Indiana | 363,014 | Fort Wayne, IN Metropolitan Statistical Area | Fort Wayne-Huntington-Auburn, IN Combined Statistical Area |
| 18005 | Bartholomew County | Indiana | 79,587 | Columbus, IN Metropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18007 | Benton County | Indiana | 8,767 | Lafayette-West Lafayette, IN Metropolitan Statistical Area | Lafayette-West Lafayette-Frankfort, IN Combined Statistical Area |
| 18009 | Blackford County | Indiana | 12,481 |  |  |
| 18011 | Boone County | Indiana | 60,477 | Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18013 | Brown County | Indiana | 15,023 | Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18015 | Carroll County | Indiana | 20,086 | Lafayette-West Lafayette, IN Metropolitan Statistical Area | Lafayette-West Lafayette-Frankfort, IN Combined Statistical Area |
| 18017 | Cass County | Indiana | 38,463 | Logansport, IN Micropolitan Statistical Area |  |
| 18019 | Clark County | Indiana | 112,938 | Louisville/Jefferson County, KY-IN Metropolitan Statistical Area | Louisville/Jefferson County–Elizabethtown–Madison, KY-IN Combined Statistical Area |
| 18021 | Clay County | Indiana | 26,803 | Terre Haute, IN Metropolitan Statistical Area |  |
| 18023 | Clinton County | Indiana | 32,916 | Frankfort, IN Micropolitan Statistical Area | Lafayette-West Lafayette-Frankfort, IN Combined Statistical Area |
| 18025 | Crawford County | Indiana | 10,621 |  |  |
| 18027 | Daviess County | Indiana | 32,407 | Washington, IN Micropolitan Statistical Area |  |
| 18029 | Dearborn County | Indiana | 49,904 | Cincinnati, OH-KY-IN Metropolitan Statistical Area | Cincinnati-Wilmington-Maysville, OH-KY-IN Combined Statistical Area |
| 18031 | Decatur County | Indiana | 26,277 | Greensburg, IN Micropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18033 | DeKalb County | Indiana | 42,307 | Auburn, IN Micropolitan Statistical Area | Fort Wayne-Huntington-Auburn, IN Combined Statistical Area |
| 18035 | Delaware County | Indiana | 117,484 | Muncie, IN Metropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18037 | Dubois County | Indiana | 42,361 | Jasper, IN Micropolitan Statistical Area |  |
| 18039 | Elkhart County | Indiana | 200,563 | Elkhart-Goshen, IN Metropolitan Statistical Area | South Bend-Elkhart-Mishawaka, IN-MI Combined Statistical Area |
| 18041 | Fayette County | Indiana | 23,861 | Connersville, IN Micropolitan Statistical Area | Richmond-Connersville, IN Combined Statistical Area |
| 18043 | Floyd County | Indiana | 76,244 | Louisville/Jefferson County, KY-IN Metropolitan Statistical Area | Louisville/Jefferson County–Elizabethtown–Madison, KY-IN Combined Statistical Area |
| 18045 | Fountain County | Indiana | 16,880 |  |  |
| 18047 | Franklin County | Indiana | 22,951 |  |  |
| 18049 | Fulton County | Indiana | 20,449 |  |  |
| 18051 | Gibson County | Indiana | 33,612 |  |  |
| 18053 | Grant County | Indiana | 69,126 | Marion, IN Micropolitan Statistical Area |  |
| 18055 | Greene County | Indiana | 32,781 |  |  |
| 18057 | Hamilton County | Indiana | 296,693 | Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18059 | Hancock County | Indiana | 71,575 | Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18061 | Harrison County | Indiana | 39,163 | Louisville/Jefferson County, KY-IN Metropolitan Statistical Area | Louisville/Jefferson County–Elizabethtown–Madison, KY-IN Combined Statistical Area |
| 18063 | Hendricks County | Indiana | 153,879 | Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18065 | Henry County | Indiana | 49,044 | New Castle, IN Micropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18067 | Howard County | Indiana | 82,760 | Kokomo, IN Metropolitan Statistical Area | Kokomo-Peru, IN Combined Statistical Area |
| 18069 | Huntington County | Indiana | 36,791 | Huntington, IN Micropolitan Statistical Area | Fort Wayne-Huntington-Auburn, IN Combined Statistical Area |
| 18071 | Jackson County | Indiana | 43,466 | Seymour, IN Micropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18073 | Jasper County | Indiana | 33,389 | Chicago-Naperville-Elgin, IL-IN-WI Metropolitan Statistical Area | Chicago-Naperville, IL-IN-WI Combined Statistical Area |
| 18075 | Jay County | Indiana | 21,330 |  |  |
| 18077 | Jefferson County | Indiana | 32,458 | Madison, IN Micropolitan Statistical Area | Louisville/Jefferson County–Elizabethtown–Madison, KY-IN Combined Statistical Area |
| 18079 | Jennings County | Indiana | 28,241 | North Vernon, IN Micropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18081 | Johnson County | Indiana | 145,535 | Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18083 | Knox County | Indiana | 37,954 | Vincennes, IN Micropolitan Statistical Area |  |
| 18085 | Kosciusko County | Indiana | 77,963 | Warsaw, IN Micropolitan Statistical Area |  |
| 18087 | LaGrange County | Indiana | 37,996 |  |  |
| 18089 | Lake County | Indiana | 491,456 | Chicago-Naperville-Elgin, IL-IN-WI Metropolitan Statistical Area | Chicago-Naperville, IL-IN-WI Combined Statistical Area |
| 18091 | LaPorte County | Indiana | 111,281 | Michigan City-La Porte, IN Metropolitan Statistical Area | Chicago-Naperville, IL-IN-WI Combined Statistical Area |
| 18093 | Lawrence County | Indiana | 45,844 | Bedford, IN Micropolitan Statistical Area | Bloomington-Bedford, IN Combined Statistical Area |
| 18095 | Madison County | Indiana | 130,482 | Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18097 | Marion County | Indiana | 928,281 | Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18099 | Marshall County | Indiana | 47,109 | Plymouth, IN Micropolitan Statistical Area | South Bend-Elkhart-Mishawaka, IN-MI Combined Statistical Area |
| 18101 | Martin County | Indiana | 10,160 |  |  |
| 18103 | Miami County | Indiana | 36,140 | Peru, IN Micropolitan Statistical Area | Kokomo-Peru, IN Combined Statistical Area |
| 18105 | Monroe County | Indiana | 141,888 | Bloomington, IN Metropolitan Statistical Area | Bloomington-Bedford, IN Combined Statistical Area |
| 18107 | Montgomery County | Indiana | 38,177 | Crawfordsville, IN Micropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18109 | Morgan County | Indiana | 69,782 | Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18111 | Newton County | Indiana | 14,087 | Chicago-Naperville-Elgin, IL-IN-WI Metropolitan Statistical Area | Chicago-Naperville, IL-IN-WI Combined Statistical Area |
| 18113 | Noble County | Indiana | 47,570 | Kendallville, IN Micropolitan Statistical Area | Fort Wayne-Huntington-Auburn, IN Combined Statistical Area |
| 18115 | Ohio County | Indiana | 5,994 | Cincinnati, OH-KY-IN Metropolitan Statistical Area | Cincinnati-Wilmington-Maysville, OH-KY-IN Combined Statistical Area |
| 18117 | Orange County | Indiana | 19,773 |  |  |
| 18119 | Owen County | Indiana | 21,201 | Bloomington, IN Metropolitan Statistical Area | Bloomington-Bedford, IN Combined Statistical Area |
| 18121 | Parke County | Indiana | 17,202 |  |  |
| 18123 | Perry County | Indiana | 19,558 |  |  |
| 18125 | Pike County | Indiana | 12,683 | Jasper, IN Micropolitan Statistical Area |  |
| 18127 | Porter County | Indiana | 166,557 | Chicago-Naperville-Elgin, IL-IN-WI Metropolitan Statistical Area | Chicago-Naperville, IL-IN-WI Combined Statistical Area |
| 18129 | Posey County | Indiana | 25,486 | Evansville, IN-KY Metropolitan Statistical Area |  |
| 18131 | Pulaski County | Indiana | 13,007 |  |  |
| 18133 | Putnam County | Indiana | 37,505 | Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18135 | Randolph County | Indiana | 25,627 |  |  |
| 18137 | Ripley County | Indiana | 28,419 |  |  |
| 18139 | Rush County | Indiana | 17,004 |  |  |
| 18141 | St. Joseph County | Indiana | 266,709 | South Bend-Mishawaka, IN-MI Metropolitan Statistical Area | South Bend-Elkhart-Mishawaka, IN-MI Combined Statistical Area |
| 18143 | Scott County | Indiana | 23,972 | Louisville/Jefferson County, KY-IN Metropolitan Statistical Area | Louisville/Jefferson County–Elizabethtown–Madison, KY-IN Combined Statistical Area |
| 18145 | Shelby County | Indiana | 44,729 | Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area | Indianapolis-Carmel-Muncie, IN Combined Statistical Area |
| 18147 | Spencer County | Indiana | 20,944 |  |  |
| 18149 | Starke County | Indiana | 23,197 |  |  |
| 18151 | Steuben County | Indiana | 34,358 | Angola, IN Micropolitan Statistical Area | Fort Wayne-Huntington-Auburn, IN Combined Statistical Area |
| 18153 | Sullivan County | Indiana | 21,223 | Terre Haute, IN Metropolitan Statistical Area |  |
| 18155 | Switzerland County | Indiana | 10,526 |  |  |
| 18157 | Tippecanoe County | Indiana | 180,174 | Lafayette-West Lafayette, IN Metropolitan Statistical Area | Lafayette-West Lafayette-Frankfort, IN Combined Statistical Area |
| 18159 | Tipton County | Indiana | 15,650 |  |  |
| 18161 | Union County | Indiana | 7,277 | Cincinnati, OH-KY-IN Metropolitan Statistical Area | Cincinnati-Wilmington-Maysville, OH-KY-IN Combined Statistical Area |
| 18163 | Vanderburgh County | Indiana | 181,398 | Evansville, IN-KY Metropolitan Statistical Area |  |
| 18165 | Vermillion County | Indiana | 15,878 | Terre Haute, IN Metropolitan Statistical Area |  |
| 18167 | Vigo County | Indiana | 108,291 | Terre Haute, IN Metropolitan Statistical Area |  |
| 18169 | Wabash County | Indiana | 32,358 | Wabash, IN Micropolitan Statistical Area |  |
| 18171 | Warren County | Indiana | 8,415 |  |  |
| 18173 | Warrick County | Indiana | 61,049 | Evansville, IN-KY Metropolitan Statistical Area |  |
| 18175 | Washington County | Indiana | 27,780 | Louisville/Jefferson County, KY-IN Metropolitan Statistical Area | Louisville/Jefferson County–Elizabethtown–Madison, KY-IN Combined Statistical Area |
| 18177 | Wayne County | Indiana | 67,893 | Richmond, IN Micropolitan Statistical Area | Richmond-Connersville, IN Combined Statistical Area |
| 18179 | Wells County | Indiana | 27,814 | Fort Wayne, IN Metropolitan Statistical Area | Fort Wayne-Huntington-Auburn, IN Combined Statistical Area |
| 18181 | White County | Indiana | 24,466 |  |  |
| 18183 | Whitley County | Indiana | 33,294 | Fort Wayne, IN Metropolitan Statistical Area | Fort Wayne-Huntington-Auburn, IN Combined Statistical Area |
| 19001 | Adair County | Iowa | 7,472 |  |  |
| 19003 | Adams County | Iowa | 3,894 |  |  |
| 19005 | Allamakee County | Iowa | 14,169 |  |  |
| 19007 | Appanoose County | Iowa | 12,692 |  |  |
| 19009 | Audubon County | Iowa | 5,873 |  |  |
| 19011 | Benton County | Iowa | 25,699 | Cedar Rapids, IA Metropolitan Statistical Area | Cedar Rapids-Iowa City, IA Combined Statistical Area |
| 19013 | Black Hawk County | Iowa | 132,546 | Waterloo-Cedar Falls, IA Metropolitan Statistical Area |  |
| 19015 | Boone County | Iowa | 26,364 | Boone, IA Micropolitan Statistical Area | Des Moines-Ames-West Des Moines, IA Combined Statistical Area |
| 19017 | Bremer County | Iowa | 24,624 | Waterloo-Cedar Falls, IA Metropolitan Statistical Area |  |
| 19019 | Buchanan County | Iowa | 20,976 |  |  |
| 19021 | Buena Vista County | Iowa | 20,567 | Storm Lake, IA Micropolitan Statistical Area |  |
| 19023 | Butler County | Iowa | 15,021 |  |  |
| 19025 | Calhoun County | Iowa | 9,926 |  |  |
| 19027 | Carroll County | Iowa | 20,598 |  |  |
| 19029 | Cass County | Iowa | 13,598 |  |  |
| 19031 | Cedar County | Iowa | 18,393 |  |  |
| 19033 | Cerro Gordo County | Iowa | 43,575 | Mason City, IA Micropolitan Statistical Area |  |
| 19035 | Cherokee County | Iowa | 11,945 |  |  |
| 19037 | Chickasaw County | Iowa | 12,321 |  |  |
| 19039 | Clarke County | Iowa | 9,325 |  |  |
| 19041 | Clay County | Iowa | 16,491 | Spencer, IA Micropolitan Statistical Area |  |
| 19043 | Clayton County | Iowa | 17,773 |  |  |
| 19045 | Clinton County | Iowa | 48,420 | Clinton, IA Micropolitan Statistical Area | Davenport-Moline, IA-IL Combined Statistical Area |
| 19047 | Crawford County | Iowa | 17,434 |  |  |
| 19049 | Dallas County | Iowa | 74,641 | Des Moines-West Des Moines, IA Metropolitan Statistical Area | Des Moines-Ames-West Des Moines, IA Combined Statistical Area |
| 19051 | Davis County | Iowa | 8,791 | Ottumwa, IA Micropolitan Statistical Area |  |
| 19053 | Decatur County | Iowa | 8,136 |  |  |
| 19055 | Delaware County | Iowa | 17,534 |  |  |
| 19057 | Des Moines County | Iowa | 40,480 | Burlington, IA-IL Micropolitan Statistical Area |  |
| 19059 | Dickinson County | Iowa | 16,955 | Spirit Lake, IA Micropolitan Statistical Area |  |
| 19061 | Dubuque County | Iowa | 95,697 | Dubuque, IA Metropolitan Statistical Area |  |
| 19063 | Emmet County | Iowa | 9,996 |  |  |
| 19065 | Fayette County | Iowa | 20,502 |  |  |
| 19067 | Floyd County | Iowa | 16,092 |  |  |
| 19069 | Franklin County | Iowa | 10,548 |  |  |
| 19071 | Fremont County | Iowa | 7,080 |  |  |
| 19073 | Greene County | Iowa | 9,139 |  |  |
| 19075 | Grundy County | Iowa | 12,314 | Waterloo-Cedar Falls, IA Metropolitan Statistical Area |  |
| 19077 | Guthrie County | Iowa | 10,687 | Des Moines-West Des Moines, IA Metropolitan Statistical Area | Des Moines-Ames-West Des Moines, IA Combined Statistical Area |
| 19079 | Hamilton County | Iowa | 15,312 |  |  |
| 19081 | Hancock County | Iowa | 11,094 |  |  |
| 19083 | Hardin County | Iowa | 17,441 |  |  |
| 19085 | Harrison County | Iowa | 14,431 | Omaha-Council Bluffs, NE-IA Metropolitan Statistical Area | Omaha-Council Bluffs-Fremont, NE-IA Combined Statistical Area |
| 19087 | Henry County | Iowa | 20,222 |  |  |
| 19089 | Howard County | Iowa | 9,526 |  |  |
| 19091 | Humboldt County | Iowa | 9,688 |  |  |
| 19093 | Ida County | Iowa | 7,141 |  |  |
| 19095 | Iowa County | Iowa | 16,330 |  |  |
| 19097 | Jackson County | Iowa | 19,587 |  |  |
| 19099 | Jasper County | Iowa | 36,641 | Newton, IA Micropolitan Statistical Area | Des Moines-Ames-West Des Moines, IA Combined Statistical Area |
| 19101 | Jefferson County | Iowa | 16,810 | Fairfield, IA Micropolitan Statistical Area |  |
| 19103 | Johnson County | Iowa | 139,155 | Iowa City, IA Metropolitan Statistical Area | Cedar Rapids-Iowa City, IA Combined Statistical Area |
| 19105 | Jones County | Iowa | 20,611 | Cedar Rapids, IA Metropolitan Statistical Area | Cedar Rapids-Iowa City, IA Combined Statistical Area |
| 19107 | Keokuk County | Iowa | 10,329 |  |  |
| 19109 | Kossuth County | Iowa | 15,321 |  |  |
| 19111 | Lee County | Iowa | 35,682 | Fort Madison-Keokuk, IA-IL-MO Micropolitan Statistical Area |  |
| 19113 | Linn County | Iowa | 216,111 | Cedar Rapids, IA Metropolitan Statistical Area | Cedar Rapids-Iowa City, IA Combined Statistical Area |
| 19115 | Louisa County | Iowa | 11,282 |  |  |
| 19117 | Lucas County | Iowa | 8,746 |  |  |
| 19119 | Lyon County | Iowa | 11,712 |  |  |
| 19121 | Madison County | Iowa | 15,448 | Des Moines-West Des Moines, IA Metropolitan Statistical Area | Des Moines-Ames-West Des Moines, IA Combined Statistical Area |
| 19123 | Mahaska County | Iowa | 22,417 | Oskaloosa, IA Micropolitan Statistical Area |  |
| 19125 | Marion County | Iowa | 33,252 |  |  |
| 19127 | Marshall County | Iowa | 40,994 | Marshalltown, IA Micropolitan Statistical Area |  |
| 19129 | Mills County | Iowa | 14,896 | Omaha-Council Bluffs, NE-IA Metropolitan Statistical Area | Omaha-Council Bluffs-Fremont, NE-IA Combined Statistical Area |
| 19131 | Mitchell County | Iowa | 10,709 |  |  |
| 19133 | Monona County | Iowa | 9,121 |  |  |
| 19135 | Monroe County | Iowa | 8,012 |  |  |
| 19137 | Montgomery County | Iowa | 10,424 |  |  |
| 19139 | Muscatine County | Iowa | 42,836 | Muscatine, IA Micropolitan Statistical Area | Davenport-Moline, IA-IL Combined Statistical Area |
| 19141 | O'Brien County | Iowa | 14,044 |  |  |
| 19143 | Osceola County | Iowa | 6,211 |  |  |
| 19145 | Page County | Iowa | 15,713 |  |  |
| 19147 | Palo Alto County | Iowa | 9,185 |  |  |
| 19149 | Plymouth County | Iowa | 24,957 | Sioux City, IA-NE-SD Metropolitan Statistical Area | Sioux City-Vermillion, IA-SD-NE Combined Statistical Area |
| 19151 | Pocahontas County | Iowa | 7,154 |  |  |
| 19153 | Polk County | Iowa | 451,677 | Des Moines-West Des Moines, IA Metropolitan Statistical Area | Des Moines-Ames-West Des Moines, IA Combined Statistical Area |