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| City : | Newcastle City |
| County : | King County, Massac County, Union Parish |
| State : | Washington (WA) |
| Land Area : | 4.45 sq mi |
| Water Area : | 0.01 sq mi |
| Latitude : | 47.5318707 |
| Longitude : | -122.1656119 |
| Population (2010): | 10,380 |
| Population Estimate (2012) : | 10,358 |
| Population Density : | 2,334.08/sq mi |
| Housing Units (2012) : | 4,227 |
| Median Household Income (2012) : | $106,771 (Washington : $59,374, USA : $53,046) |
| Median Family Income (2012) : | $134,063 (Washington : $71,939, USA : $64,585) |
| Median House Price (2012) : | $542,400 (Washington : $272,900, USA : $181,400) |