| | Monroe, OR | Millersville, PA | United States |
| Population | 792 | 7,698 | 329,725,481 |
| Female Population | 47.6% | 53.1% | 50.5% |
| Male Population | 52.4% | 46.9% | 49.5% |
| Median Age | 34.7 | 28.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 616 | 8,134 | 309,327,143 |
| Population - 2000 | 607 | 7,774 | 285,036,114 |
| Population - 1990 | 448 | 8,099 | 251,960,433 |
| Pop. 2000 to Now | 8.2% | 6.6% | 15.6% |
| Pop. 1990 to Now | 46.7% | 2.4% | 30.8% |
| space4 | | | |
| Population Density | 1,568.3 | 3,982.4 | 93.4 |
| Land Area | 0.5 | 1.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Monroe, OR | Millersville, PA | United States |
| Age 0 to 4 | 4.4% | 2.3% | 5.9% |
| Age 5 to 9 | 8.6% | 1.2% | 6.1% |
| Age 10 to 14 | 10.0% | 4.7% | 6.6% |
| Age 15 to 17 | 4.4% | 3.1% | 3.9% |
| Age 18 to 20 | 0.6% | 21.1% | 4.0% |
| Age 21 to 24 | 5.3% | 14.4% | 5.2% |
| Age 25 to 34 | 17.6% | 8.0% | 13.8% |
| Age 35 to 44 | 14.3% | 10.5% | 12.9% |
| Age 45 to 54 | 8.1% | 8.9% | 12.6% |
| Age 55 to 59 | 6.3% | 6.1% | 6.7% |
| Age 60 to 64 | 4.9% | 5.4% | 6.3% |
| Age 65 to 74 | 10.0% | 7.2% | 9.6% |
| Age 75 to 84 | 5.3% | 4.2% | 4.5% |
| Age 85 and over | 0.3% | 2.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Monroe, OR | Millersville, PA | United States |
| White | 56.9% | 70.5% | 59.4% |
| Black | 0.0% | 6.1% | 12.2% |
| Asian | 1.9% | 7.8% | 5.6% |
| Native American | 0.4% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.3% | 0.0% | 0.4% |
| Two or More Races | 6.9% | 5.8% | 3.2% |
| Hispanic | 32.6% | 9.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Monroe, OR | Millersville, PA | United States |
| Married Population | 48.2% | 28.5% | 49.8% |
| Currently Married | 46.1% | 27.4% | 48.0% |
| Married but Separated | 2.1% | 1.1% | 1.8% |
| Single Population | 51.8% | 71.5% | 50.2% |
| Never Married | 31.1% | 60.0% | 33.8% |
| Divorced | 17.7% | 7.0% | 10.8% |
| Widowed | 3.0% | 4.5% | 5.6% |
| space5 | | | |
| Household Size | 2.82 | 2.54 | 2.60 |
| Households | 281 | 2,541 | 124,010,992 |
| Family Households | 186 | 1,344 | 80,755,759 |
| Married couple, w/children | 27.4% | 23.3% | 30.5% |
| Married couple, no children | 30.6% | 49.7% | 42.9% |
| Non Family Households | 95 | 1,197 | 43,255,233 |
| Single householder, w/children | 19.4% | 16.3% | 15.8% |
| Single householder, no children | 22.6% | 10.7% | 10.8% |