| | Mount Pleasant, TX | Birch Bay, WA | United States |
| Population | 16,067 | 10,062 | 329,725,481 |
| Female Population | 50.5% | 46.7% | 50.5% |
| Male Population | 49.5% | 53.3% | 49.5% |
| Median Age | 29.5 | 46.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 15,994 | 7,881 | 309,327,143 |
| Population - 2000 | 13,935 | 4,961 | 285,036,114 |
| Population - 1990 | 12,291 | 2,656 | 251,960,433 |
| Pop. 2000 to Now | 15.0% | 89.9% | 15.6% |
| Pop. 1990 to Now | 30.3% | 254.7% | 30.8% |
| space4 | | | |
| Population Density | 1,031.9 | 628.1 | 93.4 |
| Land Area | 15.6 | 16.0 | 3,531,905.4 |
| Water Area | 0.3 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mount Pleasant, TX | Birch Bay, WA | United States |
| Age 0 to 4 | 8.5% | 6.4% | 5.9% |
| Age 5 to 9 | 8.7% | 4.9% | 6.1% |
| Age 10 to 14 | 9.4% | 4.9% | 6.6% |
| Age 15 to 17 | 5.4% | 2.5% | 3.9% |
| Age 18 to 20 | 4.2% | 1.4% | 4.0% |
| Age 21 to 24 | 7.0% | 5.4% | 5.2% |
| Age 25 to 34 | 13.2% | 10.9% | 13.8% |
| Age 35 to 44 | 10.8% | 10.1% | 12.9% |
| Age 45 to 54 | 12.7% | 13.1% | 12.6% |
| Age 55 to 59 | 4.2% | 8.7% | 6.7% |
| Age 60 to 64 | 4.5% | 8.2% | 6.3% |
| Age 65 to 74 | 6.2% | 15.0% | 9.6% |
| Age 75 to 84 | 3.7% | 6.8% | 4.5% |
| Age 85 and over | 1.4% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mount Pleasant, TX | Birch Bay, WA | United States |
| White | 31.3% | 79.4% | 59.4% |
| Black | 13.6% | 0.0% | 12.2% |
| Asian | 0.8% | 1.7% | 5.6% |
| Native American | 0.1% | 1.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.7% | 0.2% |
| Other | 0.4% | 0.2% | 0.4% |
| Two or More Races | 1.3% | 10.1% | 3.2% |
| Hispanic | 52.4% | 6.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Mount Pleasant, TX | Birch Bay, WA | United States |
| Married Population | 48.3% | 61.0% | 49.8% |
| Currently Married | 43.1% | 57.0% | 48.0% |
| Married but Separated | 5.2% | 4.0% | 1.8% |
| Single Population | 51.7% | 39.0% | 50.2% |
| Never Married | 36.3% | 22.7% | 33.8% |
| Divorced | 10.0% | 11.7% | 10.8% |
| Widowed | 5.4% | 4.5% | 5.6% |
| space5 | | | |
| Household Size | 3.00 | 2.20 | 2.60 |
| Households | 5,292 | 4,570 | 124,010,992 |
| Family Households | 3,606 | 2,916 | 80,755,759 |
| Married couple, w/children | 35.9% | 21.4% | 30.5% |
| Married couple, no children | 27.3% | 58.1% | 42.9% |
| Non Family Households | 1,686 | 1,654 | 43,255,233 |
| Single householder, w/children | 25.3% | 14.6% | 15.8% |
| Single householder, no children | 11.4% | 5.9% | 10.8% |