| | Leavenworth, KS | Adelanto, CA | United States |
| Population | 37,216 | 37,229 | 329,725,481 |
| Female Population | 45.5% | 46.6% | 50.5% |
| Male Population | 54.5% | 53.4% | 49.5% |
| Median Age | 36.9 | 28.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 35,380 | 31,679 | 309,327,143 |
| Population - 2000 | 35,420 | 18,130 | 285,036,114 |
| Population - 1990 | 38,495 | 8,517 | 251,960,433 |
| Pop. 2000 to Now | 1.5% | 90.5% | 15.6% |
| Pop. 1990 to Now | -6.7% | 305.5% | 30.8% |
| space4 | | | |
| Population Density | 1,518.9 | 703.7 | 93.4 |
| Land Area | 24.5 | 52.9 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Leavenworth, KS | Adelanto, CA | United States |
| Age 0 to 4 | 7.5% | 8.3% | 5.9% |
| Age 5 to 9 | 7.3% | 9.0% | 6.1% |
| Age 10 to 14 | 5.8% | 10.3% | 6.6% |
| Age 15 to 17 | 2.7% | 5.7% | 3.9% |
| Age 18 to 20 | 3.3% | 6.8% | 4.0% |
| Age 21 to 24 | 6.3% | 5.0% | 5.2% |
| Age 25 to 34 | 13.5% | 16.3% | 13.8% |
| Age 35 to 44 | 15.9% | 14.2% | 12.9% |
| Age 45 to 54 | 11.3% | 11.0% | 12.6% |
| Age 55 to 59 | 7.0% | 4.5% | 6.7% |
| Age 60 to 64 | 5.9% | 3.4% | 6.3% |
| Age 65 to 74 | 8.3% | 3.6% | 9.6% |
| Age 75 to 84 | 4.2% | 1.3% | 4.5% |
| Age 85 and over | 1.0% | 0.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Leavenworth, KS | Adelanto, CA | United States |
| White | 70.6% | 9.9% | 59.4% |
| Black | 11.1% | 15.8% | 12.2% |
| Asian | 1.7% | 1.3% | 5.6% |
| Native American | 0.6% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.4% | 0.2% |
| Other | 0.5% | 0.1% | 0.4% |
| Two or More Races | 7.0% | 4.5% | 3.2% |
| Hispanic | 8.5% | 67.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Leavenworth, KS | Adelanto, CA | United States |
| Married Population | 52.2% | 40.7% | 49.8% |
| Currently Married | 49.4% | 37.2% | 48.0% |
| Married but Separated | 2.7% | 3.5% | 1.8% |
| Single Population | 47.8% | 59.3% | 50.2% |
| Never Married | 28.5% | 48.7% | 33.8% |
| Divorced | 13.9% | 7.3% | 10.8% |
| Widowed | 5.3% | 3.4% | 5.6% |
| space5 | | | |
| Household Size | 2.49 | 4.06 | 2.60 |
| Households | 13,554 | 8,451 | 124,010,992 |
| Family Households | 8,504 | 7,113 | 80,755,759 |
| Married couple, w/children | 34.2% | 35.2% | 30.5% |
| Married couple, no children | 44.1% | 21.6% | 42.9% |
| Non Family Households | 5,050 | 1,338 | 43,255,233 |
| Single householder, w/children | 16.0% | 32.1% | 15.8% |
| Single householder, no children | 5.8% | 11.1% | 10.8% |