| | Portland, CT | Holt, AL | United States |
| Population | 9,459 | 4,793 | 329,725,481 |
| Female Population | 50.9% | 47.6% | 50.5% |
| Male Population | 49.1% | 52.4% | 49.5% |
| Median Age | 41.3 | 32.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 9,500 | 3,991 | 309,327,143 |
| Population - 2000 | 8,732 | 4,103 | 285,036,114 |
| Population - 1990 | 8,418 | 4,125 | 251,960,433 |
| Pop. 2000 to Now | 5.5% | -0.9% | 15.6% |
| Pop. 1990 to Now | 9.4% | -1.4% | 30.8% |
| space4 | | | |
| Population Density | 405.1 | 1,514.9 | 93.4 |
| Land Area | 23.4 | 3.2 | 3,531,905.4 |
| Water Area | 1.5 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Portland, CT | Holt, AL | United States |
| Age 0 to 4 | 5.8% | 8.8% | 5.9% |
| Age 5 to 9 | 4.4% | 6.4% | 6.1% |
| Age 10 to 14 | 7.6% | 9.5% | 6.6% |
| Age 15 to 17 | 5.3% | 4.5% | 3.9% |
| Age 18 to 20 | 3.0% | 2.6% | 4.0% |
| Age 21 to 24 | 3.6% | 5.2% | 5.2% |
| Age 25 to 34 | 10.1% | 15.3% | 13.8% |
| Age 35 to 44 | 14.1% | 10.3% | 12.9% |
| Age 45 to 54 | 16.9% | 13.7% | 12.6% |
| Age 55 to 59 | 6.3% | 5.8% | 6.7% |
| Age 60 to 64 | 5.8% | 4.5% | 6.3% |
| Age 65 to 74 | 8.8% | 8.1% | 9.6% |
| Age 75 to 84 | 6.0% | 4.4% | 4.5% |
| Age 85 and over | 2.2% | 1.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Portland, CT | Holt, AL | United States |
| White | 90.2% | 37.2% | 59.4% |
| Black | 0.9% | 45.8% | 12.2% |
| Asian | 2.2% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.7% | 0.0% | 0.4% |
| Two or More Races | 1.9% | 0.0% | 3.2% |
| Hispanic | 4.1% | 17.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Portland, CT | Holt, AL | United States |
| Married Population | 54.8% | 42.8% | 49.8% |
| Currently Married | 53.4% | 41.4% | 48.0% |
| Married but Separated | 1.3% | 1.4% | 1.8% |
| Single Population | 45.2% | 57.2% | 50.2% |
| Never Married | 29.0% | 37.8% | 33.8% |
| Divorced | 11.0% | 10.8% | 10.8% |
| Widowed | 5.2% | 8.6% | 5.6% |
| space5 | | | |
| Household Size | 2.62 | 3.50 | 2.60 |
| Households | 3,564 | 1,365 | 124,010,992 |
| Family Households | 2,553 | 983 | 80,755,759 |
| Married couple, w/children | 33.9% | 25.6% | 30.5% |
| Married couple, no children | 45.3% | 34.5% | 42.9% |
| Non Family Households | 1,011 | 382 | 43,255,233 |
| Single householder, w/children | 11.8% | 31.2% | 15.8% |
| Single householder, no children | 9.1% | 8.6% | 10.8% |