| | Westlake, OH | Hamilton, MT | United States |
| Population | 34,049 | 4,632 | 329,725,481 |
| Female Population | 51.5% | 56.1% | 50.5% |
| Male Population | 48.5% | 43.9% | 49.5% |
| Median Age | 46.3 | 48.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 32,683 | 4,288 | 309,327,143 |
| Population - 2000 | 31,719 | 3,705 | 285,036,114 |
| Population - 1990 | 27,018 | 2,737 | 251,960,433 |
| Pop. 2000 to Now | 0.6% | 36.5% | 15.6% |
| Pop. 1990 to Now | 18.1% | 84.7% | 30.8% |
| space4 | | | |
| Population Density | 2,138.0 | 1,910.9 | 93.4 |
| Land Area | 15.9 | 2.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Westlake, OH | Hamilton, MT | United States |
| Age 0 to 4 | 5.2% | 6.7% | 5.9% |
| Age 5 to 9 | 5.0% | 2.4% | 6.1% |
| Age 10 to 14 | 6.5% | 2.2% | 6.6% |
| Age 15 to 17 | 4.1% | 2.3% | 3.9% |
| Age 18 to 20 | 2.3% | 1.6% | 4.0% |
| Age 21 to 24 | 4.2% | 4.9% | 5.2% |
| Age 25 to 34 | 11.7% | 10.0% | 13.8% |
| Age 35 to 44 | 9.8% | 16.0% | 12.9% |
| Age 45 to 54 | 13.2% | 11.1% | 12.6% |
| Age 55 to 59 | 7.3% | 5.9% | 6.7% |
| Age 60 to 64 | 8.4% | 6.6% | 6.3% |
| Age 65 to 74 | 12.4% | 14.1% | 9.6% |
| Age 75 to 84 | 5.8% | 8.8% | 4.5% |
| Age 85 and over | 4.3% | 7.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Westlake, OH | Hamilton, MT | United States |
| White | 85.7% | 91.3% | 59.4% |
| Black | 2.5% | 0.0% | 12.2% |
| Asian | 5.9% | 0.8% | 5.6% |
| Native American | 0.1% | 1.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 3.0% | 2.1% | 3.2% |
| Hispanic | 2.6% | 4.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Westlake, OH | Hamilton, MT | United States |
| Married Population | 54.4% | 40.5% | 49.8% |
| Currently Married | 53.6% | 39.7% | 48.0% |
| Married but Separated | 0.8% | 0.8% | 1.8% |
| Single Population | 45.6% | 59.5% | 50.2% |
| Never Married | 28.8% | 23.6% | 33.8% |
| Divorced | 9.3% | 21.3% | 10.8% |
| Widowed | 7.5% | 14.6% | 5.6% |
| space5 | | | |
| Household Size | 2.30 | 1.68 | 2.60 |
| Households | 14,446 | 2,652 | 124,010,992 |
| Family Households | 8,588 | 1,155 | 80,755,759 |
| Married couple, w/children | 35.1% | 22.2% | 30.5% |
| Married couple, no children | 49.3% | 48.4% | 42.9% |
| Non Family Households | 5,858 | 1,497 | 43,255,233 |
| Single householder, w/children | 6.5% | 15.5% | 15.8% |
| Single householder, no children | 9.2% | 13.9% | 10.8% |