USA
> California > Zip Code 94523
| Zip Code : | 94523 |
| City : | Concord city, Martinez city, Pleasant Hill city, Reliez Valley, Contra Costa Centre |
| County : | Contra Costa County |
| State : | California (CA) |
| Land Area : | 7.24 sq mi |
| Water Area : | 0.00 sq mi |
| Latitude : | 37.9541410 |
| Longitude : | -122.0761238 |
| Population (2010): | 33,569 |
| Population Estimate (2012) : | 33,728 |
| Population Density : | 4,639.74/sq mi |
| Housing Units (2012) : | 14,505 |
| Median Household Income (2012) : | $77,117 (California : $61,400, USA : $53,046) |
| Median Family Income (2012) : | $107,601 (California : $69,883, USA : $64,585) |
| Median House Price (2012) : | $533,700 (California : $383,900, USA : $181,400) |