| | Fall River, MA | Trinidad, CO | United States |
| Population | 93,339 | 8,318 | 329,725,481 |
| Female Population | 51.8% | 47.2% | 50.5% |
| Male Population | 48.2% | 52.9% | 49.5% |
| Median Age | 39.4 | 43.1 | 38.4 |
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| Population - 2010 | 88,885 | 9,011 | 309,327,143 |
| Population - 2000 | 91,938 | 9,078 | 285,036,114 |
| Population - 1990 | 92,703 | 8,580 | 251,960,433 |
| Pop. 2000 to Now | -2.3% | -10.5% | 15.6% |
| Pop. 1990 to Now | -3.1% | -5.3% | 30.8% |
| space4 | | | |
| Population Density | 2,818.7 | 886.2 | 93.4 |
| Land Area | 33.1 | 9.4 | 3,531,905.4 |
| Water Area | 7.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Fall River, MA | Trinidad, CO | United States |
| Age 0 to 4 | 6.2% | 4.5% | 5.9% |
| Age 5 to 9 | 5.1% | 5.2% | 6.1% |
| Age 10 to 14 | 6.2% | 5.0% | 6.6% |
| Age 15 to 17 | 3.3% | 4.4% | 3.9% |
| Age 18 to 20 | 2.7% | 4.0% | 4.0% |
| Age 21 to 24 | 5.2% | 4.7% | 5.2% |
| Age 25 to 34 | 15.0% | 12.9% | 13.8% |
| Age 35 to 44 | 12.6% | 12.4% | 12.9% |
| Age 45 to 54 | 14.0% | 11.8% | 12.6% |
| Age 55 to 59 | 6.7% | 8.1% | 6.7% |
| Age 60 to 64 | 7.2% | 6.5% | 6.3% |
| Age 65 to 74 | 8.9% | 12.6% | 9.6% |
| Age 75 to 84 | 4.7% | 5.3% | 4.5% |
| Age 85 and over | 2.3% | 2.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Fall River, MA | Trinidad, CO | United States |
| White | 71.4% | 46.3% | 59.4% |
| Black | 5.8% | 0.2% | 12.2% |
| Asian | 2.7% | 1.0% | 5.6% |
| Native American | 0.2% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.2% | 0.7% | 0.4% |
| Two or More Races | 7.0% | 4.6% | 3.2% |
| Hispanic | 11.8% | 46.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Fall River, MA | Trinidad, CO | United States |
| Married Population | 42.8% | 41.2% | 49.8% |
| Currently Married | 40.1% | 38.9% | 48.0% |
| Married but Separated | 2.6% | 2.3% | 1.8% |
| Single Population | 57.2% | 58.8% | 50.2% |
| Never Married | 39.3% | 34.7% | 33.8% |
| Divorced | 11.3% | 16.7% | 10.8% |
| Widowed | 6.7% | 7.5% | 5.6% |
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| Household Size | 2.25 | 2.12 | 2.60 |
| Households | 40,862 | 3,756 | 124,010,992 |
| Family Households | 24,285 | 2,028 | 80,755,759 |
| Married couple, w/children | 20.4% | 19.1% | 30.5% |
| Married couple, no children | 37.6% | 44.6% | 42.9% |
| Non Family Households | 16,577 | 1,728 | 43,255,233 |
| Single householder, w/children | 28.0% | 25.8% | 15.8% |
| Single householder, no children | 14.0% | 10.5% | 10.8% |