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| City : | Black Diamond City |
| County : | King County, Sagadahoc County |
| State : | Washington (WA) |
| Land Area : | 6.01 sq mi |
| Water Area : | 0.64 sq mi |
| Latitude : | 47.3147463 |
| Longitude : | -122.0176959 |
| Population (2010): | 4,151 |
| Population Estimate (2012) : | 4,170 |
| Population Density : | 690.14/sq mi |
| Housing Units (2012) : | 1,685 |
| Median Household Income (2012) : | $85,100 (Washington : $59,374, USA : $53,046) |
| Median Family Income (2012) : | $99,036 (Washington : $71,939, USA : $64,585) |
| Median House Price (2012) : | $319,900 (Washington : $272,900, USA : $181,400) |