| | Platte City, MO | Ankeny, IA | United States |
| Population | 4,711 | 66,346 | 329,725,481 |
| Female Population | 51.9% | 49.7% | 50.5% |
| Male Population | 48.1% | 50.3% | 49.5% |
| Median Age | 31.3 | 32.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,686 | 45,840 | 309,327,143 |
| Population - 2000 | 3,866 | 27,117 | 285,036,114 |
| Population - 1990 | 2,947 | 18,482 | 251,960,433 |
| Pop. 2000 to Now | 28.5% | 158.4% | 15.6% |
| Pop. 1990 to Now | 68.6% | 279.1% | 30.8% |
| space4 | | | |
| Population Density | 1,189.4 | 2,216.2 | 93.4 |
| Land Area | 4.0 | 29.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Platte City, MO | Ankeny, IA | United States |
| Age 0 to 4 | 7.5% | 7.5% | 5.9% |
| Age 5 to 9 | 9.9% | 7.0% | 6.1% |
| Age 10 to 14 | 10.5% | 8.9% | 6.6% |
| Age 15 to 17 | 5.5% | 3.7% | 3.9% |
| Age 18 to 20 | 2.3% | 4.4% | 4.0% |
| Age 21 to 24 | 8.0% | 5.5% | 5.2% |
| Age 25 to 34 | 11.8% | 15.7% | 13.8% |
| Age 35 to 44 | 17.7% | 16.4% | 12.9% |
| Age 45 to 54 | 13.6% | 12.0% | 12.6% |
| Age 55 to 59 | 3.0% | 4.5% | 6.7% |
| Age 60 to 64 | 3.2% | 3.7% | 6.3% |
| Age 65 to 74 | 4.4% | 6.3% | 9.6% |
| Age 75 to 84 | 0.7% | 3.1% | 4.5% |
| Age 85 and over | 2.0% | 1.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Platte City, MO | Ankeny, IA | United States |
| White | 92.2% | 90.3% | 59.4% |
| Black | 1.4% | 1.3% | 12.2% |
| Asian | 0.6% | 2.5% | 5.6% |
| Native American | 0.6% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.3% | 2.7% | 3.2% |
| Hispanic | 3.8% | 3.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Platte City, MO | Ankeny, IA | United States |
| Married Population | 39.9% | 56.8% | 49.8% |
| Currently Married | 37.3% | 56.3% | 48.0% |
| Married but Separated | 2.6% | 0.6% | 1.8% |
| Single Population | 60.1% | 43.2% | 50.2% |
| Never Married | 34.2% | 31.0% | 33.8% |
| Divorced | 23.2% | 8.6% | 10.8% |
| Widowed | 2.7% | 3.6% | 5.6% |
| space5 | | | |
| Household Size | 2.44 | 2.57 | 2.60 |
| Households | 1,827 | 25,591 | 124,010,992 |
| Family Households | 1,121 | 16,362 | 80,755,759 |
| Married couple, w/children | 23.7% | 46.1% | 30.5% |
| Married couple, no children | 21.4% | 39.6% | 42.9% |
| Non Family Households | 706 | 9,229 | 43,255,233 |
| Single householder, w/children | 47.6% | 10.0% | 15.8% |
| Single householder, no children | 7.2% | 4.3% | 10.8% |