| | Elgin, OK | Cache, OK | United States |
| Population | 3,498 | 2,914 | 329,725,481 |
| Female Population | 49.4% | 48.9% | 50.5% |
| Male Population | 50.6% | 51.1% | 49.5% |
| Median Age | 31.3 | 36.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,239 | 2,828 | 309,327,143 |
| Population - 2000 | 1,210 | 2,371 | 285,036,114 |
| Population - 1990 | 975 | 2,251 | 251,960,433 |
| Pop. 2000 to Now | 167.4% | 19.1% | 15.6% |
| Pop. 1990 to Now | 231.9% | 25.5% | 30.8% |
| space4 | | | |
| Population Density | 911.2 | 829.5 | 93.4 |
| Land Area | 3.8 | 3.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Elgin, OK | Cache, OK | United States |
| Age 0 to 4 | 8.7% | 5.7% | 5.9% |
| Age 5 to 9 | 7.5% | 7.7% | 6.1% |
| Age 10 to 14 | 10.8% | 7.1% | 6.6% |
| Age 15 to 17 | 4.7% | 6.0% | 3.9% |
| Age 18 to 20 | 2.1% | 3.0% | 4.0% |
| Age 21 to 24 | 4.9% | 3.8% | 5.2% |
| Age 25 to 34 | 22.2% | 14.9% | 13.8% |
| Age 35 to 44 | 12.2% | 13.9% | 12.9% |
| Age 45 to 54 | 9.3% | 11.7% | 12.6% |
| Age 55 to 59 | 4.9% | 6.0% | 6.7% |
| Age 60 to 64 | 2.1% | 8.5% | 6.3% |
| Age 65 to 74 | 8.7% | 6.3% | 9.6% |
| Age 75 to 84 | 1.6% | 4.0% | 4.5% |
| Age 85 and over | 0.1% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Elgin, OK | Cache, OK | United States |
| White | 66.8% | 61.2% | 59.4% |
| Black | 4.2% | 3.3% | 12.2% |
| Asian | 1.3% | 1.3% | 5.6% |
| Native American | 0.9% | 6.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.5% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 10.4% | 13.9% | 3.2% |
| Hispanic | 16.1% | 13.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Elgin, OK | Cache, OK | United States |
| Married Population | 63.3% | 58.7% | 49.8% |
| Currently Married | 61.5% | 53.3% | 48.0% |
| Married but Separated | 1.8% | 5.4% | 1.8% |
| Single Population | 36.7% | 41.3% | 50.2% |
| Never Married | 20.0% | 24.6% | 33.8% |
| Divorced | 11.2% | 11.6% | 10.8% |
| Widowed | 5.4% | 5.1% | 5.6% |
| space5 | | | |
| Household Size | 2.77 | 2.63 | 2.60 |
| Households | 1,261 | 1,110 | 124,010,992 |
| Family Households | 915 | 764 | 80,755,759 |
| Married couple, w/children | 51.6% | 40.7% | 30.5% |
| Married couple, no children | 32.6% | 35.9% | 42.9% |
| Non Family Households | 346 | 346 | 43,255,233 |
| Single householder, w/children | 12.4% | 19.0% | 15.8% |
| Single householder, no children | 3.5% | 4.5% | 10.8% |