| | Seibert, CO | Celina, TX | United States |
| Population | 133 | 16,542 | 329,725,481 |
| Female Population | 54.9% | 46.1% | 50.5% |
| Male Population | 45.1% | 53.9% | 49.5% |
| Median Age | 48.8 | 37.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 181 | 6,386 | 309,327,143 |
| Population - 2000 | 180 | 1,861 | 285,036,114 |
| Population - 1990 | 181 | 1,737 | 251,960,433 |
| Pop. 2000 to Now | 18.9% | 980.8% | 15.6% |
| Pop. 1990 to Now | 18.2% | 1,058.0% | 30.8% |
| space4 | | | |
| Population Density | 387.8 | 592.4 | 93.4 |
| Land Area | 0.3 | 27.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Seibert, CO | Celina, TX | United States |
| Age 0 to 4 | 9.0% | 5.7% | 5.9% |
| Age 5 to 9 | 4.5% | 9.4% | 6.1% |
| Age 10 to 14 | 8.3% | 8.5% | 6.6% |
| Age 15 to 17 | 3.8% | 5.5% | 3.9% |
| Age 18 to 20 | 0.0% | 1.7% | 4.0% |
| Age 21 to 24 | 1.5% | 3.3% | 5.2% |
| Age 25 to 34 | 12.0% | 13.2% | 13.8% |
| Age 35 to 44 | 5.3% | 16.7% | 12.9% |
| Age 45 to 54 | 24.1% | 13.8% | 12.6% |
| Age 55 to 59 | 3.8% | 2.8% | 6.7% |
| Age 60 to 64 | 0.0% | 5.3% | 6.3% |
| Age 65 to 74 | 20.3% | 11.5% | 9.6% |
| Age 75 to 84 | 2.3% | 2.0% | 4.5% |
| Age 85 and over | 5.3% | 0.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Seibert, CO | Celina, TX | United States |
| White | 95.5% | 64.1% | 59.4% |
| Black | 0.0% | 7.6% | 12.2% |
| Asian | 0.0% | 6.8% | 5.6% |
| Native American | 0.0% | 0.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.0% | 1.3% | 0.4% |
| Two or More Races | 0.0% | 9.4% | 3.2% |
| Hispanic | 4.5% | 9.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Seibert, CO | Celina, TX | United States |
| Married Population | 43.3% | 68.3% | 49.8% |
| Currently Married | 43.3% | 67.4% | 48.0% |
| Married but Separated | 0.0% | 0.9% | 1.8% |
| Single Population | 56.7% | 31.7% | 50.2% |
| Never Married | 22.1% | 21.0% | 33.8% |
| Divorced | 17.3% | 9.2% | 10.8% |
| Widowed | 17.3% | 1.5% | 5.6% |
| space5 | | | |
| Household Size | 2.11 | 2.93 | 2.60 |
| Households | 63 | 5,615 | 124,010,992 |
| Family Households | 25 | 5,014 | 80,755,759 |
| Married couple, w/children | 20.0% | 46.2% | 30.5% |
| Married couple, no children | 48.0% | 39.8% | 42.9% |
| Non Family Households | 38 | 601 | 43,255,233 |
| Single householder, w/children | 16.0% | 11.1% | 15.8% |
| Single householder, no children | 16.0% | 2.8% | 10.8% |