Demographics
| Historical populations | |||
|---|---|---|---|
| Census | Pop. | %± | |
| 1860 | 1,632 |
|
|
| 1870 | 5,214 | 219.5% | |
| 1880 | 9,004 | 72.7% | |
| 1890 | 14,001 | 55.5% | |
| 1900 | 18,197 | 30.0% | |
| 1910 | 22,012 | 21.0% | |
| 1920 | 23,003 | 4.5% | |
| 1930 | 28,075 | 22.0% | |
| 1940 | 31,570 | 12.4% | |
| 1950 | 33,631 | 6.5% | |
| 1960 | 33,871 | 0.7% | |
| 1970 | 29,610 | −12.6% | |
| 1980 | 27,381 | −7.5% | |
| 1990 | 24,488 | −10.6% | |
| 2000 | 24,998 | 2.1% | |
| 2010 | 25,036 | 0.2% | |
Read more about this topic: Ottumwa, Iowa