| | Ninilchik, AK | Seldovia, AK | United States |
| Population | 964 | 171 | 329,725,481 |
| Female Population | 42.6% | 52.6% | 50.5% |
| Male Population | 57.4% | 47.4% | 49.5% |
| Median Age | 48.8 | 57.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 490 | 255 | 309,327,143 |
| Population - 2000 | 772 | 286 | 285,036,114 |
| Population - 1990 | 456 | 316 | 251,960,433 |
| Pop. 2000 to Now | -1.8% | -2.8% | 15.6% |
| Pop. 1990 to Now | 66.2% | -12.0% | 30.8% |
| space4 | | | |
| Population Density | 4.7 | 441.9 | 93.4 |
| Land Area | 207.2 | 0.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Ninilchik, AK | Seldovia, AK | United States |
| Age 0 to 4 | 8.4% | 2.9% | 5.9% |
| Age 5 to 9 | 5.2% | 0.0% | 6.1% |
| Age 10 to 14 | 6.4% | 4.1% | 6.6% |
| Age 15 to 17 | 2.5% | 7.0% | 3.9% |
| Age 18 to 20 | 5.0% | 7.6% | 4.0% |
| Age 21 to 24 | 2.2% | 0.0% | 5.2% |
| Age 25 to 34 | 10.8% | 4.7% | 13.8% |
| Age 35 to 44 | 8.5% | 0.0% | 12.9% |
| Age 45 to 54 | 8.0% | 18.1% | 12.6% |
| Age 55 to 59 | 8.6% | 10.5% | 6.7% |
| Age 60 to 64 | 11.6% | 18.1% | 6.3% |
| Age 65 to 74 | 15.8% | 15.8% | 9.6% |
| Age 75 to 84 | 4.9% | 9.4% | 4.5% |
| Age 85 and over | 2.2% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Ninilchik, AK | Seldovia, AK | United States |
| White | 79.6% | 76.0% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.8% | 0.0% | 5.6% |
| Native American | 8.7% | 7.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.0% | 0.4% |
| Two or More Races | 5.4% | 16.4% | 3.2% |
| Hispanic | 5.1% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Ninilchik, AK | Seldovia, AK | United States |
| Married Population | 58.0% | 49.1% | 49.8% |
| Currently Married | 56.8% | 49.1% | 48.0% |
| Married but Separated | 1.2% | 0.0% | 1.8% |
| Single Population | 42.0% | 50.9% | 50.2% |
| Never Married | 22.7% | 30.2% | 33.8% |
| Divorced | 12.1% | 16.4% | 10.8% |
| Widowed | 7.3% | 4.4% | 5.6% |
| space5 | | | |
| Household Size | 2.44 | 1.86 | 2.60 |
| Households | 395 | 92 | 124,010,992 |
| Family Households | 250 | 55 | 80,755,759 |
| Married couple, w/children | 23.2% | 20.0% | 30.5% |
| Married couple, no children | 65.2% | 47.3% | 42.9% |
| Non Family Households | 145 | 37 | 43,255,233 |
| Single householder, w/children | 9.6% | 14.5% | 15.8% |
| Single householder, no children | 2.0% | 18.2% | 10.8% |