| | Monroe, UT | Grantsville, UT | United States |
| Population | 2,497 | 12,331 | 329,725,481 |
| Female Population | 50.7% | 46.7% | 50.5% |
| Male Population | 49.3% | 53.3% | 49.5% |
| Median Age | 45.9 | 27.9 | 38.4 |
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| Population - 2010 | 2,271 | 8,972 | 309,327,143 |
| Population - 2000 | 1,845 | 6,015 | 285,036,114 |
| Population - 1990 | 1,472 | 4,500 | 251,960,433 |
| Pop. 2000 to Now | 29.2% | 106.3% | 15.6% |
| Pop. 1990 to Now | 61.9% | 175.8% | 30.8% |
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| Population Density | 695.4 | 329.4 | 93.4 |
| Land Area | 3.6 | 37.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Monroe, UT | Grantsville, UT | United States |
| Age 0 to 4 | 3.0% | 7.1% | 5.9% |
| Age 5 to 9 | 5.3% | 11.3% | 6.1% |
| Age 10 to 14 | 8.1% | 13.6% | 6.6% |
| Age 15 to 17 | 4.1% | 6.2% | 3.9% |
| Age 18 to 20 | 3.9% | 2.8% | 4.0% |
| Age 21 to 24 | 3.8% | 4.6% | 5.2% |
| Age 25 to 34 | 8.3% | 11.4% | 13.8% |
| Age 35 to 44 | 11.0% | 14.8% | 12.9% |
| Age 45 to 54 | 13.7% | 11.9% | 12.6% |
| Age 55 to 59 | 8.3% | 3.9% | 6.7% |
| Age 60 to 64 | 8.6% | 4.3% | 6.3% |
| Age 65 to 74 | 10.9% | 5.4% | 9.6% |
| Age 75 to 84 | 8.4% | 2.0% | 4.5% |
| Age 85 and over | 2.7% | 0.7% | 1.9% |
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| Race | | | |
| | Monroe, UT | Grantsville, UT | United States |
| White | 95.4% | 90.8% | 59.4% |
| Black | 0.7% | 0.2% | 12.2% |
| Asian | 1.1% | 1.1% | 5.6% |
| Native American | 0.0% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.6% | 0.4% | 3.2% |
| Hispanic | 1.2% | 7.0% | 18.4% |
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| Marriage & Family | | | |
| | Monroe, UT | Grantsville, UT | United States |
| Married Population | 61.9% | 60.3% | 49.8% |
| Currently Married | 61.1% | 59.5% | 48.0% |
| Married but Separated | 0.8% | 0.8% | 1.8% |
| Single Population | 38.1% | 39.7% | 50.2% |
| Never Married | 21.1% | 28.8% | 33.8% |
| Divorced | 11.1% | 7.4% | 10.8% |
| Widowed | 5.8% | 3.5% | 5.6% |
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| Household Size | 2.63 | 3.62 | 2.60 |
| Households | 946 | 3,402 | 124,010,992 |
| Family Households | 652 | 3,018 | 80,755,759 |
| Married couple, w/children | 32.8% | 50.3% | 30.5% |
| Married couple, no children | 56.0% | 27.2% | 42.9% |
| Non Family Households | 294 | 384 | 43,255,233 |
| Single householder, w/children | 0.0% | 16.4% | 15.8% |
| Single householder, no children | 11.2% | 6.1% | 10.8% |