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> Washington > Zip Code 98850
| Zip Code : | 98850 |
| City : | Rock Island city |
| County : | Douglas County |
| State : | Washington (WA) |
| Land Area : | 22.70 sq mi |
| Water Area : | 2.73 sq mi |
| Latitude : | 47.3099236 |
| Longitude : | -120.0759826 |
| Population (2010): | 1,543 |
| Population Estimate (2012) : | 1,514 |
| Population Density : | 67.98/sq mi |
| Housing Units (2012) : | 596 |
| Median Household Income (2012) : | $41,484 (Washington : $59,374, USA : $53,046) |
| Median Family Income (2012) : | $43,958 (Washington : $71,939, USA : $64,585) |
| Median House Price (2012) : | $159,700 (Washington : $272,900, USA : $181,400) |