| | Belmont, OH | Trinidad, CO | United States |
| Population | 381 | 8,318 | 329,725,481 |
| Female Population | 49.1% | 47.2% | 50.5% |
| Male Population | 50.9% | 52.9% | 49.5% |
| Median Age | 50.3 | 43.1 | 38.4 |
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| Population - 2010 | 452 | 9,011 | 309,327,143 |
| Population - 2000 | 532 | 9,078 | 285,036,114 |
| Population - 1990 | 471 | 8,580 | 251,960,433 |
| Pop. 2000 to Now | -19.4% | -10.5% | 15.6% |
| Pop. 1990 to Now | -8.9% | -5.3% | 30.8% |
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| Population Density | 1,432.3 | 886.2 | 93.4 |
| Land Area | 0.3 | 9.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Belmont, OH | Trinidad, CO | United States |
| Age 0 to 4 | 2.4% | 4.5% | 5.9% |
| Age 5 to 9 | 6.8% | 5.2% | 6.1% |
| Age 10 to 14 | 4.7% | 5.0% | 6.6% |
| Age 15 to 17 | 2.4% | 4.4% | 3.9% |
| Age 18 to 20 | 0.3% | 4.0% | 4.0% |
| Age 21 to 24 | 12.6% | 4.7% | 5.2% |
| Age 25 to 34 | 8.1% | 12.9% | 13.8% |
| Age 35 to 44 | 8.7% | 12.4% | 12.9% |
| Age 45 to 54 | 8.1% | 11.8% | 12.6% |
| Age 55 to 59 | 15.0% | 8.1% | 6.7% |
| Age 60 to 64 | 9.7% | 6.5% | 6.3% |
| Age 65 to 74 | 16.8% | 12.6% | 9.6% |
| Age 75 to 84 | 4.5% | 5.3% | 4.5% |
| Age 85 and over | 0.0% | 2.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Belmont, OH | Trinidad, CO | United States |
| White | 97.1% | 46.3% | 59.4% |
| Black | 0.3% | 0.2% | 12.2% |
| Asian | 0.0% | 1.0% | 5.6% |
| Native American | 1.3% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.7% | 0.4% |
| Two or More Races | 1.3% | 4.6% | 3.2% |
| Hispanic | 0.0% | 46.8% | 18.4% |
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| Marriage & Family | | | |
| | Belmont, OH | Trinidad, CO | United States |
| Married Population | 51.8% | 41.2% | 49.8% |
| Currently Married | 46.6% | 38.9% | 48.0% |
| Married but Separated | 5.2% | 2.3% | 1.8% |
| Single Population | 48.2% | 58.8% | 50.2% |
| Never Married | 30.8% | 34.7% | 33.8% |
| Divorced | 12.2% | 16.7% | 10.8% |
| Widowed | 5.2% | 7.5% | 5.6% |
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| Household Size | 2.65 | 2.12 | 2.60 |
| Households | 140 | 3,756 | 124,010,992 |
| Family Households | 110 | 2,028 | 80,755,759 |
| Married couple, w/children | 14.5% | 19.1% | 30.5% |
| Married couple, no children | 55.5% | 44.6% | 42.9% |
| Non Family Households | 30 | 1,728 | 43,255,233 |
| Single householder, w/children | 20.0% | 25.8% | 15.8% |
| Single householder, no children | 10.0% | 10.5% | 10.8% |