| | Bel Aire, KS | Valley Center, KS | United States |
| Population | 8,148 | 8,365 | 329,725,481 |
| Female Population | 48.8% | 50.8% | 50.5% |
| Male Population | 51.2% | 49.3% | 49.5% |
| Median Age | 32.4 | 33.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 6,779 | 6,828 | 309,327,143 |
| Population - 2000 | 5,836 | 4,883 | 285,036,114 |
| Population - 1990 | 3,695 | 3,624 | 251,960,433 |
| Pop. 2000 to Now | 45.1% | 51.2% | 15.6% |
| Pop. 1990 to Now | 129.2% | 103.8% | 30.8% |
| space4 | | | |
| Population Density | 1,204.6 | 1,177.8 | 93.4 |
| Land Area | 6.8 | 7.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Bel Aire, KS | Valley Center, KS | United States |
| Age 0 to 4 | 11.8% | 10.9% | 5.9% |
| Age 5 to 9 | 4.8% | 9.9% | 6.1% |
| Age 10 to 14 | 7.2% | 9.4% | 6.6% |
| Age 15 to 17 | 3.9% | 6.2% | 3.9% |
| Age 18 to 20 | 5.3% | 1.8% | 4.0% |
| Age 21 to 24 | 5.1% | 2.0% | 5.2% |
| Age 25 to 34 | 13.8% | 16.1% | 13.8% |
| Age 35 to 44 | 14.2% | 9.6% | 12.9% |
| Age 45 to 54 | 9.2% | 8.0% | 12.6% |
| Age 55 to 59 | 8.7% | 4.2% | 6.7% |
| Age 60 to 64 | 4.3% | 4.6% | 6.3% |
| Age 65 to 74 | 7.1% | 10.8% | 9.6% |
| Age 75 to 84 | 3.9% | 4.5% | 4.5% |
| Age 85 and over | 0.8% | 2.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Bel Aire, KS | Valley Center, KS | United States |
| White | 67.8% | 86.8% | 59.4% |
| Black | 10.1% | 0.0% | 12.2% |
| Asian | 5.6% | 1.8% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 4.7% | 5.5% | 3.2% |
| Hispanic | 11.7% | 5.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Bel Aire, KS | Valley Center, KS | United States |
| Married Population | 64.3% | 62.8% | 49.8% |
| Currently Married | 63.7% | 62.7% | 48.0% |
| Married but Separated | 0.6% | 0.2% | 1.8% |
| Single Population | 35.7% | 37.2% | 50.2% |
| Never Married | 25.8% | 23.7% | 33.8% |
| Divorced | 7.6% | 7.1% | 10.8% |
| Widowed | 2.3% | 6.3% | 5.6% |
| space5 | | | |
| Household Size | 2.95 | 2.79 | 2.60 |
| Households | 2,766 | 3,001 | 124,010,992 |
| Family Households | 2,156 | 2,187 | 80,755,759 |
| Married couple, w/children | 42.9% | 41.6% | 30.5% |
| Married couple, no children | 43.0% | 41.8% | 42.9% |
| Non Family Households | 610 | 814 | 43,255,233 |
| Single householder, w/children | 7.8% | 14.3% | 15.8% |
| Single householder, no children | 6.3% | 2.4% | 10.8% |