| | Calumet, IA | Ponca, NE | United States |
| Population | 175 | 832 | 329,725,481 |
| Female Population | 52.6% | 46.0% | 50.5% |
| Male Population | 47.4% | 54.0% | 49.5% |
| Median Age | 26.3 | 36.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 170 | 963 | 309,327,143 |
| Population - 2000 | 181 | 1,062 | 285,036,114 |
| Population - 1990 | 160 | 877 | 251,960,433 |
| Pop. 2000 to Now | -14.4% | -14.0% | 15.6% |
| Pop. 1990 to Now | -3.1% | 4.1% | 30.8% |
| space4 | | | |
| Population Density | 657.9 | 1,144.4 | 93.4 |
| Land Area | 0.3 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Calumet, IA | Ponca, NE | United States |
| Age 0 to 4 | 11.4% | 12.9% | 5.9% |
| Age 5 to 9 | 17.7% | 4.3% | 6.1% |
| Age 10 to 14 | 13.1% | 2.5% | 6.6% |
| Age 15 to 17 | 2.3% | 3.4% | 3.9% |
| Age 18 to 20 | 1.1% | 2.2% | 4.0% |
| Age 21 to 24 | 2.3% | 8.7% | 5.2% |
| Age 25 to 34 | 12.0% | 12.6% | 13.8% |
| Age 35 to 44 | 10.9% | 12.3% | 12.9% |
| Age 45 to 54 | 8.0% | 6.5% | 12.6% |
| Age 55 to 59 | 5.1% | 5.3% | 6.7% |
| Age 60 to 64 | 0.6% | 3.8% | 6.3% |
| Age 65 to 74 | 10.9% | 12.0% | 9.6% |
| Age 75 to 84 | 4.0% | 10.3% | 4.5% |
| Age 85 and over | 0.6% | 3.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Calumet, IA | Ponca, NE | United States |
| White | 93.1% | 87.6% | 59.4% |
| Black | 0.0% | 0.4% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 2.9% | 3.2% |
| Hispanic | 6.9% | 8.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Calumet, IA | Ponca, NE | United States |
| Married Population | 43.6% | 51.6% | 49.8% |
| Currently Married | 43.6% | 51.2% | 48.0% |
| Married but Separated | 0.0% | 0.4% | 1.8% |
| Single Population | 56.4% | 48.4% | 50.2% |
| Never Married | 28.7% | 28.7% | 33.8% |
| Divorced | 16.8% | 11.8% | 10.8% |
| Widowed | 10.9% | 7.8% | 5.6% |
| space5 | | | |
| Household Size | 2.78 | 2.10 | 2.60 |
| Households | 63 | 376 | 124,010,992 |
| Family Households | 35 | 193 | 80,755,759 |
| Married couple, w/children | 28.6% | 28.0% | 30.5% |
| Married couple, no children | 28.6% | 56.5% | 42.9% |
| Non Family Households | 28 | 183 | 43,255,233 |
| Single householder, w/children | 40.0% | 13.0% | 15.8% |
| Single householder, no children | 2.9% | 2.6% | 10.8% |