AREA AND POPULATION OF IOWA BY COUNTIES.
| County | Map Index. |
County Seat. | Area in square miles. |
Population. | |
| 1890. | 1900. | ||||
| Adair | C 3 | Greenfield | 576 | 14,534 | 16,192 |
| Adams | C 4 | Corning | 432 | 12,292 | 13,601 |
| Allamakee | F 1 | Waukon | 615 | 17,907 | 18,711 |
| Appanoose | E 4 | Centerville | 500 | 18,961 | 25,927 |
| Audubon | B 3 | Audubon | 432 | 12,412 | 13,626 |
| Benton | E 3 | Vinton | 720 | 24,178 | 25,177 |
| Blackhawk | E 2 | Waterloo | 576 | 24,219 | 32,399 |
| Boone | C 3 | Boone | 576 | 28,772 | 28,200 |
| Bremer | E 2 | Waverley | 432 | 14,630 | 16,305 |
| Buchanan | F 2 | Independence | 576 | 18,997 | 21,427 |
| Buena Vista | B 2 | Storm Lake | 576 | 13,518 | 16,975 |
| Butler | E 2 | Allison | 576 | 15,463 | 17,955 |
| Calhoun | C 2 | Rockwell City | 576 | 13,107 | 18,569 |
| Carroll | C 3 | Carroll | 576 | 18,828 | 20,319 |
| Cass | B 3 | Atlantic | 576 | 19,645 | 21,274 |
| Cedar | F 3 | Tipton | 576 | 18,253 | 19,371 |
| Cerro Gordo | D 1 | Mason City | 576 | 14,864 | 20,672 |
| Cherokee | B 2 | Cherokee | 576 | 15,659 | 16,570 |
| Chickasaw | E 1 | New Hampton | 504 | 15,019 | 17,037 |
| Clarke | D 4 | Osceola | 432 | 11,332 | 12,440 |
| Clay | B 1 | Spencer | 576 | 9,309 | 13,401 |
| Clayton | F 2 | Elkader | 745 | 26,733 | 27,750 |
| Clinton | G 3 | Clinton | 680 | 41,199 | 43,832 |
| Crawford | B 2 | Denison | 720 | 18,894 | 21,685 |
| Dallas | C 3 | Adel | 576 | 20,479 | 23,058 |
| Davis | E 4 | Bloomfield | 500 | 15,258 | 15,620 |
| Decatur | D 4 | Leon | 534 | 15,643 | 18,115 |
| Delaware | F 2 | Manchester | 576 | 17,349 | 19,185 |
| Des Moines | F 4 | Burlington | 400 | 35,324 | 35,989 |
| Dickinson | B 1 | Spirit Lake | 408 | 4,328 | 7,995 |
| Dubuque | F 2 | Dubuque | 604 | 49,848 | 56,403 |
| Emmet | C 1 | Estherville | 408 | 4,274 | 9,936 |
| Fayette | F 2 | West Union | 720 | 23,141 | 29,845 |
| Floyd | D 1 | Charles City | 504 | 15,424 | 17,754 |
| Franklin | D 2 | Hampton | 576 | 12,871 | 14,996 |
| Fremont | B 4 | Sidney | 514 | 16,842 | 18,546 |
| Greene | C 2 | Jefferson | 570 | 15,797 | 17,820 |
| Grundy | E 2 | Grundy Center | 504 | 13,215 | 13,757 |
| Guthrie | C 3 | Guthrie Center | 576 | 17,380 | 18,729 |
| Hamilton | D 2 | Webster City | 576 | 15,319 | 19,514 |
| Hancock | D 1 | Carthage | 576 | 7,621 | 13,752 |
| Hardin | D 2 | Eldora | 576 | 19,003 | 22,794 |
| Harrison | B 3 | Logan | 684 | 21,356 | 25,597 |
| Henry | F 4 | Mount Pleasant | 432 | 18,895 | 20,022 |
| Howard | E 1 | Cresco | 460 | 11,182 | 14,512 |
| Humboldt | C 2 | Dakotah | 432 | 9,836 | 12,667 |
| Ida | B 2 | Idagrove | 432 | 10,705 | 12,327 |
| Iowa | E 3 | Marengo | 576 | 18,270 | 19,544 |
