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> California > Zip Code 94521
| Zip Code : | 94521 |
| City : | Clayton city, Concord city, Walnut Creek city |
| County : | Contra Costa County |
| State : | California (CA) |
| Land Area : | 12.96 sq mi |
| Water Area : | 0.00 sq mi |
| Latitude : | 37.9560079 |
| Longitude : | -121.9561950 |
| Population (2010): | 41,249 |
| Population Estimate (2012) : | 40,854 |
| Population Density : | 3,182.21/sq mi |
| Housing Units (2012) : | 16,269 |
| Median Household Income (2012) : | $81,140 (California : $61,400, USA : $53,046) |
| Median Family Income (2012) : | $99,190 (California : $69,883, USA : $64,585) |
| Median House Price (2012) : | $417,900 (California : $383,900, USA : $181,400) |