| | Slater, IA | Slater, MO | United States |
| Population | 1,540 | 2,151 | 329,725,481 |
| Female Population | 51.0% | 51.1% | 50.5% |
| Male Population | 49.0% | 48.9% | 49.5% |
| Median Age | 38.5 | 45.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,492 | 1,857 | 309,327,143 |
| Population - 2000 | 1,306 | 2,083 | 285,036,114 |
| Population - 1990 | 1,268 | 2,186 | 251,960,433 |
| Pop. 2000 to Now | 12.6% | -15.3% | 15.6% |
| Pop. 1990 to Now | 16.0% | -19.3% | 30.8% |
| space4 | | | |
| Population Density | 842.5 | 1,487.6 | 93.4 |
| Land Area | 1.8 | 1.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Slater, IA | Slater, MO | United States |
| Age 0 to 4 | 7.7% | 9.4% | 5.9% |
| Age 5 to 9 | 8.2% | 2.4% | 6.1% |
| Age 10 to 14 | 6.6% | 5.9% | 6.6% |
| Age 15 to 17 | 2.9% | 1.6% | 3.9% |
| Age 18 to 20 | 2.9% | 3.3% | 4.0% |
| Age 21 to 24 | 3.7% | 3.3% | 5.2% |
| Age 25 to 34 | 13.3% | 17.9% | 13.8% |
| Age 35 to 44 | 14.4% | 6.0% | 12.9% |
| Age 45 to 54 | 9.3% | 12.3% | 12.6% |
| Age 55 to 59 | 9.0% | 8.6% | 6.7% |
| Age 60 to 64 | 6.6% | 6.7% | 6.3% |
| Age 65 to 74 | 9.7% | 9.9% | 9.6% |
| Age 75 to 84 | 3.4% | 7.3% | 4.5% |
| Age 85 and over | 2.3% | 5.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Slater, IA | Slater, MO | United States |
| White | 88.9% | 84.9% | 59.4% |
| Black | 0.5% | 4.5% | 12.2% |
| Asian | 0.7% | 1.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.6% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.2% | 3.3% | 3.2% |
| Hispanic | 8.7% | 5.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Slater, IA | Slater, MO | United States |
| Married Population | 62.4% | 45.3% | 49.8% |
| Currently Married | 62.4% | 43.4% | 48.0% |
| Married but Separated | 0.1% | 2.0% | 1.8% |
| Single Population | 37.6% | 54.7% | 50.2% |
| Never Married | 21.0% | 32.0% | 33.8% |
| Divorced | 11.8% | 14.4% | 10.8% |
| Widowed | 4.7% | 8.2% | 5.6% |
| space5 | | | |
| Household Size | 2.39 | 2.46 | 2.60 |
| Households | 644 | 859 | 124,010,992 |
| Family Households | 428 | 456 | 80,755,759 |
| Married couple, w/children | 38.6% | 21.9% | 30.5% |
| Married couple, no children | 48.1% | 55.3% | 42.9% |
| Non Family Households | 216 | 403 | 43,255,233 |
| Single householder, w/children | 5.4% | 15.4% | 15.8% |
| Single householder, no children | 7.9% | 7.5% | 10.8% |