(CO-99-2) County Population Estimates for July 1, 1999 and Population Change for April 1, 1990 to July 1, 1999 (includes revised April 1, 1990 Population Estimates Base) Source: Population Estimates Program, Population Division, U.S. Census Bureau, Washington, DC 20233 Contact: Demographic Call Center Staff, 1-866-758-1060 Internet Release Date: March 9, 2000 4/1/90 Numeric Percent Population Population Population 7/1/99 Estimates Change Change FIPS State/County Code and Area Name Estimate Base 1990-99 1990-99 19 Iowa............................... 2,869,413 2,776,831 92,582 3.3 19001 Adair County, IA................... 8,066 8,409 -343 -4.1 19003 Adams County, IA................... 4,405 4,866 -461 -9.5 19005 Allamakee County, IA............... 14,068 13,855 213 1.5 19007 Appanoose County, IA............... 13,446 13,743 -297 -2.2 19009 Audubon County, IA................. 6,802 7,334 -532 -7.3 19011 Benton County, IA.................. 25,798 22,429 3,369 15.0 19013 Black Hawk County, IA.............. 119,959 123,798 -3,839 -3.1 19015 Boone County, IA................... 26,300 25,186 1,114 4.4 19017 Bremer County, IA.................. 23,440 22,813 627 2.7 19019 Buchanan County, IA................ 21,160 20,844 316 1.5 19021 Buena Vista County, IA............. 19,404 19,965 -561 -2.8 19023 Butler County, IA.................. 15,499 15,731 -232 -1.5 19025 Calhoun County, IA................. 11,319 11,508 -189 -1.6 19027 Carroll County, IA................. 21,518 21,423 95 0.4 19029 Cass County, IA.................... 14,512 15,128 -616 -4.1 19031 Cedar County, IA................... 18,056 17,444 612 3.5 19033 Cerro Gordo County, IA............. 45,669 46,733 -1,064 -2.3 19035 Cherokee County, IA................ 13,060 14,098 -1,038 -7.4 19037 Chickasaw County, IA............... 13,423 13,295 128 1.0 19039 Clarke County, IA.................. 8,273 8,287 -14 -0.2 19041 Clay County, IA.................... 17,245 17,585 -340 -1.9 19043 Clayton County, IA................. 18,582 19,054 -472 -2.5 19045 Clinton County, IA................. 49,612 51,040 -1,428 -2.8 19047 Crawford County, IA................ 16,427 16,775 -348 -2.1 19049 Dallas County, IA.................. 38,210 29,755 8,455 28.4 19051 Davis County, IA................... 8,517 8,312 205 2.5 19053 Decatur County, IA................. 8,319 8,338 -19 -0.2 19055 Delaware County, IA................ 18,482 18,035 447 2.5 19057 Des Moines County, IA.............. 41,955 42,614 -659 -1.5 19059 Dickinson County, IA............... 16,285 14,909 1,376 9.2 19061 Dubuque County, IA................. 88,112 86,403 1,709 2.0 19063 Emmet County, IA................... 10,638 11,569 -931 -8.0 19065 Fayette County, IA................. 21,566 21,843 -277 -1.3 19067 Floyd County, IA................... 16,256 17,058 -802 -4.7 19069 Franklin County, IA................ 10,781 11,364 -583 -5.1 19071 Fremont County, IA................. 7,706 8,226 -520 -6.3 19073 Greene County, IA.................. 10,020 10,045 -25 -0.2 19075 Grundy County, IA.................. 12,284 12,029 255 2.1 19077 Guthrie County, IA................. 11,591 10,935 656 6.0 19079 Hamilton County, IA................ 15,905 16,071 -166 -1.0 19081 Hancock County, IA................. 12,037 12,638 -601 -4.8 19083 Hardin County, IA.................. 18,159 19,094 -935 -4.9 19085 Harrison County, IA................ 15,216 14,730 486 3.3 19087 Henry County, IA................... 20,139 19,226 913 4.7 19089 Howard County, IA.................. 9,574 9,809 -235 -2.4 19091 Humboldt County, IA................ 10,224 10,756 -532 -4.9 19093 Ida County, IA..................... 7,930 8,365 -435 -5.2 19095 Iowa County, IA.................... 15,667 14,630 1,037 7.1 19097 Jackson County, IA................. 20,157 19,950 207 1.0 19099 Jasper County, IA.................. 36,659 34,795 1,864 5.4 19101 Jefferson County, IA............... 16,762 16,310 452 2.8 19103 Johnson County, IA................. 103,813 96,119 7,694 8.0 19105 Jones County, IA................... 20,075 19,444 631 3.2 19107 Keokuk County, IA.................. 11,340 11,624 -284 -2.4 19109 Kossuth County, IA................. 17,630 18,591 -961 -5.2 19111 Lee County, IA..................... 38,309 38,687 -378 -1.0 19113 Linn County, IA.................... 184,891 168,767 16,124 9.6 19115 Louisa County, IA.................. 11,945 11,592 353 3.0 19117 Lucas County, IA................... 9,131 9,070 61 0.7 19119 Lyon County, IA.................... 12,030 11,952 78 0.7 19121 Madison County, IA................. 14,105 12,483 1,622 13.0 19123 Mahaska County, IA................. 21,954 21,532 422 2.0 19125 Marion County, IA.................. 31,529 30,001 1,528 5.1 19127 Marshall County, IA................ 38,782 38,276 506 1.3 19129 Mills County, IA................... 14,705 13,202 1,503 11.4 19131 Mitchell County, IA................ 11,106 10,928 178 1.6 19133 Monona County, IA.................. 10,089 10,034 55 0.5 19135 Monroe County, IA.................. 8,017 8,114 -97 -1.2 19137 Montgomery County, IA.............. 11,707 12,076 -369 -3.1 19139 Muscatine County, IA............... 41,195 39,907 1,288 3.2 19141 O'Brien County, IA................. 14,621 15,444 -823 -5.3 19143 Osceola County, IA................. 6,914 7,267 -353 -4.9 19145 Page County, IA.................... 17,139 16,870 269 1.6 19147 Palo Alto County, IA............... 9,917 10,669 -752 -7.0 19149 Plymouth County, IA................ 24,819 23,388 1,431 6.1 19151 Pocahontas County, IA.............. 8,774 9,525 -751 -7.9 19153 Polk County, IA.................... 364,672 327,140 37,532 11.5 19155 Pottawattamie County, IA........... 86,425 82,628 3,797 4.6 19157 Poweshiek County, IA............... 18,693 19,033 -340 -1.8 19159 Ringgold County, IA................ 5,361 5,420 -59 -1.1 19161 Sac County, IA..................... 11,761 12,324 -563 -4.6 19163 Scott County, IA................... 159,458 150,973 8,485 5.6 19165 Shelby County, IA.................. 12,781 13,230 -449 -3.4 19167 Sioux County, IA................... 31,355 29,903 1,452 4.9 19169 Story County, IA................... 75,373 74,252 1,121 1.5 19171 Tama County, IA.................... 17,788 17,419 369 2.1 19173 Taylor County, IA.................. 7,025 7,114 -89 -1.3 19175 Union County, IA................... 12,611 12,750 -139 -1.1 19177 Van Buren County, IA............... 7,873 7,676 197 2.6 19179 Wapello County, IA................. 35,458 35,696 -238 -0.7 19181 Warren County, IA.................. 40,614 36,033 4,581 12.7 19183 Washington County, IA.............. 21,147 19,612 1,535 7.8 19185 Wayne County, IA................... 6,581 7,067 -486 -6.9 19187 Webster County, IA................. 38,832 40,342 -1,510 -3.7 19189 Winnebago County, IA............... 11,971 12,122 -151 -1.2 19191 Winneshiek County, IA.............. 20,917 20,847 70 0.3 19193 Woodbury County, IA................ 101,437 98,276 3,161 3.2 19195 Worth County, IA................... 7,657 7,991 -334 -4.2 19197 Wright County, IA.................. 13,892 14,269 -377 -2.6