| | Port Aransas, TX | Matagorda, TX | United States |
| Population | 3,058 | 431 | 329,725,481 |
| Female Population | 50.5% | 42.5% | 50.5% |
| Male Population | 49.5% | 57.5% | 49.5% |
| Median Age | 55.8 | 62.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,491 | 525 | 309,327,143 |
| Population - 2000 | 3,370 | 479 | 285,036,114 |
| Population - 1990 | 2,233 | 418 | 251,960,433 |
| Pop. 2000 to Now | 30.8% | -7.3% | 15.6% |
| Pop. 1990 to Now | 97.5% | 6.2% | 30.8% |
| space4 | | | |
| Population Density | 341.9 | 233.9 | 93.4 |
| Land Area | 8.9 | 1.8 | 3,531,905.4 |
| Water Area | 5.1 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Port Aransas, TX | Matagorda, TX | United States |
| Age 0 to 4 | 3.4% | 0.0% | 5.9% |
| Age 5 to 9 | 5.4% | 0.0% | 6.1% |
| Age 10 to 14 | 1.7% | 8.4% | 6.6% |
| Age 15 to 17 | 3.7% | 0.0% | 3.9% |
| Age 18 to 20 | 1.8% | 0.0% | 4.0% |
| Age 21 to 24 | 1.6% | 5.6% | 5.2% |
| Age 25 to 34 | 6.1% | 6.5% | 13.8% |
| Age 35 to 44 | 6.9% | 4.2% | 12.9% |
| Age 45 to 54 | 18.8% | 17.9% | 12.6% |
| Age 55 to 59 | 10.7% | 5.1% | 6.7% |
| Age 60 to 64 | 12.3% | 27.1% | 6.3% |
| Age 65 to 74 | 18.1% | 15.5% | 9.6% |
| Age 75 to 84 | 8.4% | 9.7% | 4.5% |
| Age 85 and over | 1.1% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Port Aransas, TX | Matagorda, TX | United States |
| White | 85.5% | 81.2% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 1.9% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.4% | 0.0% | 3.2% |
| Hispanic | 12.9% | 16.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Port Aransas, TX | Matagorda, TX | United States |
| Married Population | 58.2% | 54.4% | 49.8% |
| Currently Married | 56.6% | 54.4% | 48.0% |
| Married but Separated | 1.5% | 0.0% | 1.8% |
| Single Population | 41.8% | 45.6% | 50.2% |
| Never Married | 17.0% | 23.0% | 33.8% |
| Divorced | 19.7% | 14.7% | 10.8% |
| Widowed | 5.1% | 7.8% | 5.6% |
| space5 | | | |
| Household Size | 2.12 | 1.87 | 2.60 |
| Households | 1,445 | 231 | 124,010,992 |
| Family Households | 924 | 148 | 80,755,759 |
| Married couple, w/children | 21.6% | 14.2% | 30.5% |
| Married couple, no children | 59.5% | 66.2% | 42.9% |
| Non Family Households | 521 | 83 | 43,255,233 |
| Single householder, w/children | 6.0% | 0.0% | 15.8% |
| Single householder, no children | 12.9% | 19.6% | 10.8% |