| | Winthrop, WA | La Conner, WA | United States |
| Population | 351 | 1,061 | 329,725,481 |
| Female Population | 54.1% | 53.4% | 50.5% |
| Male Population | 45.9% | 46.7% | 49.5% |
| Median Age | 46.6 | 57.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 405 | 871 | 309,327,143 |
| Population - 2000 | 349 | 761 | 285,036,114 |
| Population - 1990 | 302 | 656 | 251,960,433 |
| Pop. 2000 to Now | 41.0% | 25.9% | 15.6% |
| Pop. 1990 to Now | 62.9% | 46.0% | 30.8% |
| space4 | | | |
| Population Density | 377.4 | 2,652.5 | 93.4 |
| Land Area | 0.9 | 0.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Winthrop, WA | La Conner, WA | United States |
| Age 0 to 4 | 4.0% | 0.8% | 5.9% |
| Age 5 to 9 | 7.4% | 4.1% | 6.1% |
| Age 10 to 14 | 5.4% | 6.5% | 6.6% |
| Age 15 to 17 | 2.6% | 4.9% | 3.9% |
| Age 18 to 20 | 0.0% | 0.0% | 4.0% |
| Age 21 to 24 | 2.0% | 5.3% | 5.2% |
| Age 25 to 34 | 7.4% | 4.3% | 13.8% |
| Age 35 to 44 | 16.2% | 11.4% | 12.9% |
| Age 45 to 54 | 19.1% | 8.9% | 12.6% |
| Age 55 to 59 | 4.6% | 10.3% | 6.7% |
| Age 60 to 64 | 17.4% | 10.6% | 6.3% |
| Age 65 to 74 | 6.0% | 16.2% | 9.6% |
| Age 75 to 84 | 5.7% | 7.7% | 4.5% |
| Age 85 and over | 2.3% | 9.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Winthrop, WA | La Conner, WA | United States |
| White | 68.4% | 72.8% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 2.4% | 5.6% |
| Native American | 0.6% | 7.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 1.3% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 4.8% | 3.4% | 3.2% |
| Hispanic | 26.2% | 13.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Winthrop, WA | La Conner, WA | United States |
| Married Population | 56.5% | 52.9% | 49.8% |
| Currently Married | 54.8% | 52.0% | 48.0% |
| Married but Separated | 1.7% | 0.9% | 1.8% |
| Single Population | 43.5% | 47.1% | 50.2% |
| Never Married | 19.2% | 17.3% | 33.8% |
| Divorced | 17.1% | 16.5% | 10.8% |
| Widowed | 7.2% | 13.3% | 5.6% |
| space5 | | | |
| Household Size | 1.98 | 2.00 | 2.60 |
| Households | 177 | 531 | 124,010,992 |
| Family Households | 89 | 269 | 80,755,759 |
| Married couple, w/children | 25.8% | 29.4% | 30.5% |
| Married couple, no children | 64.0% | 59.9% | 42.9% |
| Non Family Households | 88 | 262 | 43,255,233 |
| Single householder, w/children | 6.7% | 3.3% | 15.8% |
| Single householder, no children | 3.4% | 7.4% | 10.8% |