(CO-99-13) Population Estimates for Counties by Age Group: July 1, 1998 Source: Population Estimates Program, Population Division, U.S. Census Bureau, Washington, DC 20233 Contact: Statistical Information Staff, Population Division, U.S. Census Bureau (301-457-2422) pop@census.gov (please include a phone number with email correspondence) Internet Release Date: August 30, 2000 Total Ages Ages Ages Ages Ages Ages Ages Ages Ages Area Name Population 0-4 5-17 18-24 25-44 45-64 16+ 21+ 65+ 85+ IOWA 2861025 182733 539802 276610 807530 623650 2230065 2006114 430700 63533 Adair County 8103 481 1521 484 1927 1904 6352 5872 1786 302 Adams County 4386 268 759 244 1049 1093 3506 3236 973 155 Allamakee County 14052 906 2808 913 3578 3168 10830 9892 2679 450 Appanoose County 13568 790 2602 972 3402 3105 10670 9698 2697 411 Audubon County 6806 416 1240 355 1539 1649 5370 4981 1607 284 Benton County 25399 1736 5223 1798 7009 5792 19297 17608 3841 481 Black Hawk County 120918 7254 22544 15101 33086 25849 94819 83764 17084 2181 Boone County 26113 1608 4738 1907 7504 6058 20535 18862 4298 813 Bremer County 23343 1248 4398 2724 5838 5356 18511 16269 3779 592 Buchanan County 21152 1522 4847 1467 5617 4579 15596 14072 3120 378 Buena Vista County 19412 1248 3610 2288 4910 3826 15166 13355 3530 556 Butler County 15631 885 3107 959 3945 3535 12192 11144 3200 484 Calhoun County 11373 627 2098 649 2894 2609 8992 8329 2496 424 Carroll County 21616 1559 4662 1428 5448 4603 16122 14716 3916 655 Cass County 14642 855 2786 834 3710 3422 11476 10593 3035 482 Cedar County 17957 1060 3581 1157 5014 4121 13893 12789 3024 459 Cerro Gordo County 46073 2849 8126 3869 12856 10147 36453 33066 8226 1209 Cherokee County 13190 799 2604 751 3315 3090 10240 9403 2631 417 Chickasaw County 13425 838 2849 829 3471 3094 10238 9322 2344 347 Clarke County 8303 511 1604 540 2181 1945 6473 5925 1522 256 Clay County 17474 1137 3447 1225 4815 3839 13399 12296 3011 480 Clayton County 18711 1177 3911 1177 4784 4300 14313 13071 3362 495 Clinton County 49924 3164 9728 3846 13754 11423 38726 35155 8009 1076 Crawford County 16462 1054 3365 1190 4205 3800 12714 11404 2848 448 Dallas County 36865 2447 7738 2526 11286 8311 27922 25455 4557 676 Davis County 8462 564 1710 597 2156 1985 6489 5886 1450 249 Decatur County 8241 464 1407 1213 1819 1761 6631 5615 1577 293 Delaware County 18541 1300 4185 1311 4906 4069 13735 12450 2770 392 Des Moines County 42069 2518 7910 3307 11699 9726 32964 30048 6909 1014 Dickinson County 16209 822 2865 918 4225 4039 13001 12086 3340 431 Dubuque County 87879 5537 17334 9009 24101 18944 68050 60483 12954 1825 Emmet County 10850 591 2172 954 2612 2359 8500 7497 2162 348 Fayette County 21794 1360 4237 1786 5445 4979 16936 15294 3987 586 Floyd County 16369 955 3150 1116 3977 3984 12815 11738 3187 504 Franklin County 10865 645 2068 647 2815 2564 8498 7857 2126 346 Fremont County 7771 439 1553 472 1925 1830 6047 5531 1552 226 Greene County 10075 566 1850 577 2472 2386 7955 7390 2224 341 Grundy County 12234 714 2331 670 3120 3013 9601 8884 2386 313 Guthrie County 11506 596 2206 646 2819 2972 9074 8399 2267 369 Hamilton County 16010 960 3008 1019 4310 3801 12561 11543 2912 423 Hancock County 12044 773 2514 727 3214 2627 9195 8408 2189 320 Hardin County 18350 978 3460 1331 4484 4152 14567 13128 3945 666 Harrison County 15336 988 3101 1022 3939 3579 11790 10740 2707 465 Henry County 20038 1209 3715 1918 5845 4297 15766 14236 3054 520 Howard County 9680 608 1962 544 2351 2248 7430 6869 1967 344 Humboldt County 10327 610 1943 584 2575 2476 8092 7479 2139 291 Ida County 7917 523 1603 420 1977 1707 6073 5584 1687 291 Iowa County 15513 1035 2890 979 4287 3638 12073 11152 2684 435 Jackson County 20139 1286 4144 1441 5139 4743 15452 14017 3386 467 Jasper County 36541 2068 6764 2753 10422 8733 28938 26507 5801 745 Jefferson County 17043 1014 3081 1128 5970 3619 13468 12402 2231 344 Johnson County 102556 6271 14195 23777 34373 15861 84305 71265 8079 1135 Jones County 20138 1190 3848 1645 5732 4500 15761 14370 3223 450 Keokuk County 11469 679 2246 726 2889 2657 8919 8176 2272 378 Kossuth County 17721 1106 3693 958 4471 4133 13553 12453 3360 550 Lee County 38488 2325 7342 2872 10891 8880 30114 27521 6178 860 Linn County 182779 11753 32930 18708 56091 40550 143815 129150 22747 2978 Louisa County 11935 760 2446 994 3330 2663 9150 8269 1742 279 Lucas County 9098 516 1642 602 2216 2258 7224 6630 1864 296 Lyon County 12036 860 2660 774 2945 2613 8970 8121 2184 351 Madison County 13888 875 2941 967 3807 3209 10603 9560 2089 353 Mahaska County 21899 1454 4221 1938 5946 4700 16935 15305 3640 538 Marion County 31327 1918 6036 3244 8334 6884 24386 21684 4911 705 Marshall County 38740 2303 7196 2921 10764 9114 30536 27828 6442 1002 Mills County 14481 853 3102 1000 4371 3309 11126 10002 1846 259 Mitchell County 11033 664 2139 677 2589 2601 8638 7913 2363 444 Monona County 10068 536 1869 543 2331 2461 7986 7382 2328 402 Monroe County 8033 457 1564 549 2012 1892 6276 5747 1559 269 Montgomery County 11850 664 2229 757 3090 2683 9359 8551 2427 435 Muscatine County 40991 2870 8470 3546 12013 8551 31051 28029 5541 840 O'Brien County 14887 884 2979 938 3655 3305 11516 10545 3126 552 Osceola County 6956 454 1391 467 1732 1583 5349 4876 1329 254 Page County 17271 883 3154 1322 4687 3836 13806 12612 3389 578 Palo Alto County 10059 568 2024 714 2283 2351 7822 7035 2119 388 Plymouth County 24609 1666 5387 1770 6334 5465 18413 16709 3987 639 Pocahontas County 8815 545 1665 413 2120 2152 6879 6390 1920 334 Polk County 359713 25268 63406 36867 117139 76488 281679 255293 40545 5277 Pottawattamie County 86190 5941 16841 7318 24532 19723 66268 59882 11835 1480 Poweshiek County 18759 1042 3407 2213 4725 4103 14939 13063 3269 521 Ringgold County 5358 262 965 280 1216 1333 4301 3987 1302 212 Sac County 11893 736 2345 659 2875 2702 9181 8498 2576 465 Scott County 158333 11289 31907 14676 48373 33644 120400 108619 18444 2189 Shelby County 12934 774 2583 775 3166 2959 10021 9189 2677 443 Sioux County 31425 2187 6780 4259 7426 6091 23490 19997 4682 665 Story County 74875 4221 10568 19778 20480 12071 61777 50884 7757 1183 Tama County 17766 1066 3447 1195 4373 4278 13846 12695 3407 577 Taylor County 7149 397 1425 417 1696 1679 5563 5112 1535 251 Union County 12522 723 2478 1019 3309 2744 9777 8767 2249 392 Van Buren County 7862 516 1489 507 1948 1864 6092 5623 1538 218 Wapello County 35387 2100 6208 3030 9426 8244 28175 25477 6379 887 Warren County 40209 2598 8284 4033 11693 9055 30805 27133 4546 672 Washington County 20938 1427 4075 1436 5754 4570 16111 14796 3676 637 Wayne County 6677 391 1171 364 1543 1591 5320 4945 1617 307 Webster County 38975 2544 7201 3343 10329 8747 30437 27513 6811 1134 Winnebago County 11942 716 2226 1090 3082 2532 9396 8281 2296 370 Winneshiek County 20962 1259 3672 3475 5058 4226 16660 14040 3272 506 Woodbury County 101547 7346 20964 9367 29121 20839 76635 68781 13910 2022 Worth County 7742 453 1443 505 1980 1852 6093 5599 1509 282 Wright County 14039 861 2489 860 3539 3255 11101 10317 3035 515 The estimates presented here were produced by a method which is still in a developmental stage. They may not be accurate for populations which are very small or have unusual distributions. These figures should be used with caution.