| | Monaca, PA | Gonzales, LA | United States |
| Population | 5,622 | 12,080 | 329,725,481 |
| Female Population | 52.2% | 53.3% | 50.5% |
| Male Population | 47.8% | 46.7% | 49.5% |
| Median Age | 40.2 | 39.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,738 | 9,818 | 309,327,143 |
| Population - 2000 | 6,286 | 8,156 | 285,036,114 |
| Population - 1990 | 6,739 | 7,003 | 251,960,433 |
| Pop. 2000 to Now | -14.7% | 37.9% | 15.6% |
| Pop. 1990 to Now | -20.4% | 60.6% | 30.8% |
| space4 | | | |
| Population Density | 2,773.6 | 1,321.7 | 93.4 |
| Land Area | 2.0 | 9.1 | 3,531,905.4 |
| Water Area | 0.4 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Monaca, PA | Gonzales, LA | United States |
| Age 0 to 4 | 5.2% | 4.3% | 5.9% |
| Age 5 to 9 | 4.7% | 6.4% | 6.1% |
| Age 10 to 14 | 8.3% | 5.2% | 6.6% |
| Age 15 to 17 | 4.2% | 6.6% | 3.9% |
| Age 18 to 20 | 3.1% | 2.8% | 4.0% |
| Age 21 to 24 | 2.0% | 4.7% | 5.2% |
| Age 25 to 34 | 14.5% | 15.5% | 13.8% |
| Age 35 to 44 | 14.8% | 12.8% | 12.9% |
| Age 45 to 54 | 12.3% | 8.4% | 12.6% |
| Age 55 to 59 | 7.9% | 12.8% | 6.7% |
| Age 60 to 64 | 5.3% | 4.4% | 6.3% |
| Age 65 to 74 | 10.5% | 9.3% | 9.6% |
| Age 75 to 84 | 5.0% | 5.1% | 4.5% |
| Age 85 and over | 2.2% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Monaca, PA | Gonzales, LA | United States |
| White | 90.1% | 40.7% | 59.4% |
| Black | 2.2% | 48.4% | 12.2% |
| Asian | 0.0% | 1.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 6.0% | 0.5% | 3.2% |
| Hispanic | 1.7% | 8.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Monaca, PA | Gonzales, LA | United States |
| Married Population | 44.9% | 41.6% | 49.8% |
| Currently Married | 42.5% | 40.0% | 48.0% |
| Married but Separated | 2.4% | 1.7% | 1.8% |
| Single Population | 55.1% | 58.4% | 50.2% |
| Never Married | 31.1% | 35.6% | 33.8% |
| Divorced | 18.4% | 16.8% | 10.8% |
| Widowed | 5.6% | 6.0% | 5.6% |
| space5 | | | |
| Household Size | 2.29 | 2.33 | 2.60 |
| Households | 2,449 | 5,083 | 124,010,992 |
| Family Households | 1,365 | 3,333 | 80,755,759 |
| Married couple, w/children | 36.9% | 17.8% | 30.5% |
| Married couple, no children | 35.2% | 40.2% | 42.9% |
| Non Family Households | 1,084 | 1,750 | 43,255,233 |
| Single householder, w/children | 13.8% | 30.9% | 15.8% |
| Single householder, no children | 14.1% | 11.1% | 10.8% |