| | Culbertson, NE | St. Francis, KS | United States |
| Population | 487 | 1,331 | 329,725,481 |
| Female Population | 42.5% | 58.5% | 50.5% |
| Male Population | 57.5% | 41.6% | 49.5% |
| Median Age | 31 | 48.7 | 38.4 |
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| Population - 2010 | 592 | 1,323 | 309,327,143 |
| Population - 2000 | 594 | 1,497 | 285,036,114 |
| Population - 1990 | 795 | 1,495 | 251,960,433 |
| Pop. 2000 to Now | -5.2% | -15.4% | 15.6% |
| Pop. 1990 to Now | -29.2% | -15.3% | 30.8% |
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| Population Density | 581.8 | 1,553.1 | 93.4 |
| Land Area | 0.8 | 0.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Culbertson, NE | St. Francis, KS | United States |
| Age 0 to 4 | 12.1% | 6.3% | 5.9% |
| Age 5 to 9 | 5.1% | 6.7% | 6.1% |
| Age 10 to 14 | 12.7% | 4.4% | 6.6% |
| Age 15 to 17 | 5.1% | 3.5% | 3.9% |
| Age 18 to 20 | 1.2% | 4.3% | 4.0% |
| Age 21 to 24 | 1.0% | 3.0% | 5.2% |
| Age 25 to 34 | 14.8% | 10.4% | 13.8% |
| Age 35 to 44 | 13.8% | 8.6% | 12.9% |
| Age 45 to 54 | 3.9% | 4.5% | 12.6% |
| Age 55 to 59 | 6.2% | 8.0% | 6.7% |
| Age 60 to 64 | 4.7% | 7.2% | 6.3% |
| Age 65 to 74 | 14.6% | 15.4% | 9.6% |
| Age 75 to 84 | 4.3% | 11.6% | 4.5% |
| Age 85 and over | 0.4% | 6.2% | 1.9% |
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| Race | | | |
| | Culbertson, NE | St. Francis, KS | United States |
| White | 99.8% | 89.9% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 1.5% | 3.2% |
| Hispanic | 0.0% | 8.6% | 18.4% |
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| Marriage & Family | | | |
| | Culbertson, NE | St. Francis, KS | United States |
| Married Population | 62.5% | 47.8% | 49.8% |
| Currently Married | 62.5% | 47.5% | 48.0% |
| Married but Separated | 0.0% | 0.4% | 1.8% |
| Single Population | 37.5% | 52.2% | 50.2% |
| Never Married | 18.2% | 22.6% | 33.8% |
| Divorced | 12.9% | 14.5% | 10.8% |
| Widowed | 6.5% | 15.1% | 5.6% |
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| Household Size | 2.52 | 2.07 | 2.60 |
| Households | 193 | 624 | 124,010,992 |
| Family Households | 130 | 279 | 80,755,759 |
| Married couple, w/children | 44.6% | 25.1% | 30.5% |
| Married couple, no children | 42.3% | 45.5% | 42.9% |
| Non Family Households | 63 | 345 | 43,255,233 |
| Single householder, w/children | 10.8% | 22.2% | 15.8% |
| Single householder, no children | 2.3% | 7.2% | 10.8% |