POPULATION
The total population of Jasper County, from 1847 to 1905, was as follows:
| Year | Population | | Year | Population |
| 1847 | 560 | | 1867 | 16,116 |
| 1849 | 1,223 | | 1870 | 22,116 |
| 1850 | 1,280 | | 1875 | 24,128 |
| 1852 | 1,647 | | 1880 | 25,963 |
| 1854 | 3,456 | | 1890 | 24,891 |
| 1856 | 7,490 | | 1895 | 25,948 |
| 1860 | 9,883 | | 1900 | 26,976 |
| 1863 | 10,590 | | 1905 | 27,156 |
| 1865 | 12,239 | | | |
In 1905 the state census report gave Jasper County a total of 27,156 population divided among the various Townships as follows:
| Township | Population | Township | Population |
| Buena Vista Township | 873 | Mariposa Township | 612 |
| Clear Creek Township | 787 | Mound Prairie Township | 1,393 |
| Des Moines Township | 1,080 | Newton Township | 902 |
| Elk Creek Township | 909 | Palo Alto Township | 1,096 |
| Fairview Township | 1,258 | Poweshiek Township | 1,032 |
| Hickory Grove Township | 638 | Richland Township | 739 |
| Independence Township | 608 | Rock Creek Township | 724 |
| Kellogg Township | 608 | Sherman Township | 75 |
| Lynn Grove Township | 883 | Washington Township | 852 |
| Malaka Township | 624 | | |
The population of cities, towns and villages in 1905 was: Baxter, 520; Colfax, 2,553; Prairie City, 756; Monroe, 836; Kellogg, 592; Lynnville, 462; Sully, 262; Mingo, 262; Newton, 4,398.
THE 1910 UNITED STATES CENSUS
The official census returns for 1910 show that Jasper County has made but a slight gain in population during the past ten years, but a review of the table given below will show that the retardation in gain is due to the falling off of the rural districts for the towns in all instances, but three show a good per cent of gain. The cities of Newton and Colfax both made good gains over the 1900 census, Newton making a gain of 25.43 percent and Colfax 22.94 percent. Lynnville, Sully and Baxter also made good gains in per cent, but the towns of Monroe, Prairie City and Kellogg show a decided falling off in population. During the past ten years the county made a gain of but 58 inhabitants, or about one-fifth of one percent.
| Jasper County | 27,034 |
| Buena Vista Township | 896 |
| Clear Creek Township | 796 |
| Des Moines Township, including Prairie City town | 1,993 |
| Prairie City town - 761 | |
| Elk Creek Township | 904 |
| Fairview Township, including Monroe town | 2,028 |
| Monroe town - 800 | |
| Hickory Grove Township | 656 |
| Independence Township, including Baxter town | 1,361 |
| Baxter town - 527 | |
| Kellogg Township, including Kellogg town | 1,255 |
| Kellogg town - 610 | |
| Lynn Grove Township, including Lynnville and Sully towns | 1,492 |
| Lynnville town - 370 | |
| Sully town - 282 | |
| Malaka Township | 601 |
| Mariposa Township | 635 |
| Mound Prairie Township | 1,383 |
| Newton Township, including Newton City | 5,518 |
| Newton city - 4,616 | |
| Ward 1 - 1,552 | |
| Ward 2 - 1,769 | |
| Ward 3 - 1,295 | |
| Palo Alto Township | 1,035 |
| Poweshiek Township, including Mingo town | 1,259 |
| Mingo town - 246 | |
| Richland Township | 755 |
| Rock Creek Township | 631 |
| Sherman Township | 573 |
| Washington Township, including Colfax City | 3,263 |
| Colfax City - 2,254 | |
| Ward 1 - 727 | |
| Ward 2 - 744 | |
| Ward 3 - 1,053 | |
Continued on next page.
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