| | Ryderwood, WA | Centralia, WA | United States |
| Population | 402 | 17,988 | 329,725,481 |
| Female Population | 59.2% | 50.2% | 50.5% |
| Male Population | 40.8% | 49.8% | 49.5% |
| Median Age | 72.9 | 37.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 330 | 16,697 | 309,327,143 |
| Population - 2000 | 284 | 14,742 | 285,036,114 |
| Population - 1990 | 218 | 12,101 | 251,960,433 |
| Pop. 2000 to Now | 26.4% | 22.1% | 15.6% |
| Pop. 1990 to Now | 64.7% | 48.7% | 30.8% |
| space4 | | | |
| Population Density | 2,496.9 | 2,391.1 | 93.4 |
| Land Area | 0.2 | 7.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Ryderwood, WA | Centralia, WA | United States |
| Age 0 to 4 | 0.0% | 7.5% | 5.9% |
| Age 5 to 9 | 0.0% | 5.5% | 6.1% |
| Age 10 to 14 | 0.0% | 6.3% | 6.6% |
| Age 15 to 17 | 0.0% | 3.6% | 3.9% |
| Age 18 to 20 | 0.0% | 3.1% | 4.0% |
| Age 21 to 24 | 0.0% | 4.9% | 5.2% |
| Age 25 to 34 | 0.0% | 16.1% | 13.8% |
| Age 35 to 44 | 0.0% | 12.2% | 12.9% |
| Age 45 to 54 | 3.7% | 9.3% | 12.6% |
| Age 55 to 59 | 4.0% | 6.0% | 6.7% |
| Age 60 to 64 | 0.0% | 5.9% | 6.3% |
| Age 65 to 74 | 48.3% | 11.5% | 9.6% |
| Age 75 to 84 | 32.3% | 5.0% | 4.5% |
| Age 85 and over | 11.7% | 3.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Ryderwood, WA | Centralia, WA | United States |
| White | 95.3% | 75.9% | 59.4% |
| Black | 0.0% | 0.9% | 12.2% |
| Asian | 0.0% | 0.9% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.4% | 0.2% |
| Other | 0.0% | 0.5% | 0.4% |
| Two or More Races | 0.5% | 3.5% | 3.2% |
| Hispanic | 4.2% | 17.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Ryderwood, WA | Centralia, WA | United States |
| Married Population | 67.4% | 38.9% | 49.8% |
| Currently Married | 64.9% | 36.4% | 48.0% |
| Married but Separated | 2.5% | 2.5% | 1.8% |
| Single Population | 32.6% | 61.1% | 50.2% |
| Never Married | 3.5% | 32.9% | 33.8% |
| Divorced | 20.1% | 20.1% | 10.8% |
| Widowed | 9.0% | 8.2% | 5.6% |
| space5 | | | |
| Household Size | 1.63 | 2.37 | 2.60 |
| Households | 246 | 7,463 | 124,010,992 |
| Family Households | 136 | 3,862 | 80,755,759 |
| Married couple, w/children | 0.0% | 27.1% | 30.5% |
| Married couple, no children | 87.5% | 34.2% | 42.9% |
| Non Family Households | 110 | 3,601 | 43,255,233 |
| Single householder, w/children | 0.0% | 26.2% | 15.8% |
| Single householder, no children | 12.5% | 12.5% | 10.8% |