| City : | Selden |
| County : | Hill County, Suffolk County |
| State : | New York (NY) |
| | |
| Land Area : | 4.32 sq mi |
| Water Area : | 0.00 sq mi |
| Latitude : | 40.8700216 |
| Longitude : | -73.0461881 |
| | |
| Population (2010): | 19,851 |
| Population Estimate (2012) : | 19,978 |
| Population Density : | 4,593.78/sq mi |
| Housing Units (2012) : | 6,739 |
| Median Household Income (2012) : | $83,794 (New York : $57,683, USA : $53,046) |
| Median Family Income (2012) : | $89,187 (New York : $69,968, USA : $64,585) |
| Median House Price (2012) : | $329,100 (New York : $295,300, USA : $181,400) |