| | Wellsville, UT | Fairview, UT | United States |
| Population | 4,036 | 1,382 | 329,725,481 |
| Female Population | 49.9% | 50.8% | 50.5% |
| Male Population | 50.1% | 49.2% | 49.5% |
| Median Age | 27.5 | 44.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,508 | 1,250 | 309,327,143 |
| Population - 2000 | 2,728 | 1,160 | 285,036,114 |
| Population - 1990 | 2,206 | 960 | 251,960,433 |
| Pop. 2000 to Now | 49.2% | 19.1% | 15.6% |
| Pop. 1990 to Now | 84.5% | 43.9% | 30.8% |
| space4 | | | |
| Population Density | 555.2 | 1,095.1 | 93.4 |
| Land Area | 7.3 | 1.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Wellsville, UT | Fairview, UT | United States |
| Age 0 to 4 | 6.3% | 5.7% | 5.9% |
| Age 5 to 9 | 8.6% | 5.0% | 6.1% |
| Age 10 to 14 | 14.7% | 5.7% | 6.6% |
| Age 15 to 17 | 9.5% | 2.5% | 3.9% |
| Age 18 to 20 | 4.0% | 2.8% | 4.0% |
| Age 21 to 24 | 5.4% | 4.6% | 5.2% |
| Age 25 to 34 | 8.6% | 11.4% | 13.8% |
| Age 35 to 44 | 15.0% | 13.3% | 12.9% |
| Age 45 to 54 | 9.5% | 14.3% | 12.6% |
| Age 55 to 59 | 3.1% | 6.2% | 6.7% |
| Age 60 to 64 | 4.7% | 10.5% | 6.3% |
| Age 65 to 74 | 6.2% | 9.8% | 9.6% |
| Age 75 to 84 | 3.7% | 6.1% | 4.5% |
| Age 85 and over | 0.7% | 2.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Wellsville, UT | Fairview, UT | United States |
| White | 87.4% | 96.0% | 59.4% |
| Black | 0.7% | 0.0% | 12.2% |
| Asian | 0.3% | 0.0% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 4.9% | 1.4% | 3.2% |
| Hispanic | 6.2% | 2.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Wellsville, UT | Fairview, UT | United States |
| Married Population | 63.7% | 71.2% | 49.8% |
| Currently Married | 63.3% | 70.6% | 48.0% |
| Married but Separated | 0.3% | 0.6% | 1.8% |
| Single Population | 36.3% | 28.8% | 50.2% |
| Never Married | 28.2% | 15.8% | 33.8% |
| Divorced | 5.4% | 6.5% | 10.8% |
| Widowed | 2.7% | 6.5% | 5.6% |
| space5 | | | |
| Household Size | 3.72 | 2.63 | 2.60 |
| Households | 1,080 | 525 | 124,010,992 |
| Family Households | 965 | 419 | 80,755,759 |
| Married couple, w/children | 56.1% | 37.0% | 30.5% |
| Married couple, no children | 34.1% | 52.3% | 42.9% |
| Non Family Households | 115 | 106 | 43,255,233 |
| Single householder, w/children | 6.2% | 6.0% | 15.8% |
| Single householder, no children | 3.6% | 4.8% | 10.8% |