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> Pennsylvania > Zip Code 18020
| Zip Code : | 18020 |
| City : | Bethlehem city, Middletown |
| County : | Northampton County |
| State : | Pennsylvania (PA) |
| Land Area : | 13.83 sq mi |
| Water Area : | 0.22 sq mi |
| Latitude : | 40.6709515 |
| Longitude : | -75.3211884 |
| Population (2010): | 20,447 |
| Population Estimate (2012) : | 20,648 |
| Population Density : | 1,478.15/sq mi |
| Housing Units (2012) : | 7,772 |
| Median Household Income (2012) : | $77,739 (Pennsylvania : $52,267, USA : $53,046) |
| Median Family Income (2012) : | $90,189 (Pennsylvania : $65,980, USA : $64,585) |
| Median House Price (2012) : | $265,800 (Pennsylvania : $164,900, USA : $181,400) |