| | Rock Creek, OH | Brighton, CO | United States |
| Population | 661 | 39,895 | 329,725,481 |
| Female Population | 54.2% | 48.5% | 50.5% |
| Male Population | 45.8% | 51.5% | 49.5% |
| Median Age | 35.4 | 34.5 | 38.4 |
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| Population - 2010 | 533 | 33,975 | 309,327,143 |
| Population - 2000 | 584 | 20,905 | 285,036,114 |
| Population - 1990 | 553 | 14,203 | 251,960,433 |
| Pop. 2000 to Now | -13.9% | 95.1% | 15.6% |
| Pop. 1990 to Now | -9.0% | 187.1% | 30.8% |
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| Population Density | 743.5 | 1,886.1 | 93.4 |
| Land Area | 0.9 | 21.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Rock Creek, OH | Brighton, CO | United States |
| Age 0 to 4 | 5.1% | 6.4% | 5.9% |
| Age 5 to 9 | 3.2% | 8.0% | 6.1% |
| Age 10 to 14 | 6.4% | 9.4% | 6.6% |
| Age 15 to 17 | 3.3% | 4.0% | 3.9% |
| Age 18 to 20 | 8.9% | 3.1% | 4.0% |
| Age 21 to 24 | 4.2% | 3.9% | 5.2% |
| Age 25 to 34 | 17.9% | 15.9% | 13.8% |
| Age 35 to 44 | 10.9% | 14.9% | 12.9% |
| Age 45 to 54 | 14.7% | 13.4% | 12.6% |
| Age 55 to 59 | 8.2% | 6.3% | 6.7% |
| Age 60 to 64 | 4.5% | 4.5% | 6.3% |
| Age 65 to 74 | 8.9% | 6.3% | 9.6% |
| Age 75 to 84 | 3.2% | 3.1% | 4.5% |
| Age 85 and over | 0.6% | 0.7% | 1.9% |
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| Race | | | |
| | Rock Creek, OH | Brighton, CO | United States |
| White | 93.9% | 55.3% | 59.4% |
| Black | 0.2% | 2.4% | 12.2% |
| Asian | 0.0% | 2.7% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 1.7% | 3.2% | 3.2% |
| Hispanic | 4.2% | 36.0% | 18.4% |
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| Marriage & Family | | | |
| | Rock Creek, OH | Brighton, CO | United States |
| Married Population | 43.3% | 54.2% | 49.8% |
| Currently Married | 38.1% | 52.7% | 48.0% |
| Married but Separated | 5.1% | 1.5% | 1.8% |
| Single Population | 56.7% | 45.8% | 50.2% |
| Never Married | 33.5% | 29.1% | 33.8% |
| Divorced | 17.6% | 11.7% | 10.8% |
| Widowed | 5.7% | 5.0% | 5.6% |
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| Household Size | 2.57 | 2.96 | 2.60 |
| Households | 257 | 12,973 | 124,010,992 |
| Family Households | 182 | 9,321 | 80,755,759 |
| Married couple, w/children | 18.7% | 40.9% | 30.5% |
| Married couple, no children | 35.7% | 37.9% | 42.9% |
| Non Family Households | 75 | 3,652 | 43,255,233 |
| Single householder, w/children | 20.3% | 14.4% | 15.8% |
| Single householder, no children | 25.3% | 6.8% | 10.8% |