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> Pennsylvania > Zip Code 18031
| Zip Code : | 18031 |
| City : | Breinigsville, Trexlertown |
| County : | Berks County, Lehigh County |
| State : | Pennsylvania (PA) |
| Land Area : | 13.77 sq mi |
| Water Area : | 0.03 sq mi |
| Latitude : | 40.5520844 |
| Longitude : | -75.6486743 |
| Population (2010): | 7,528 |
| Population Estimate (2012) : | 6,888 |
| Population Density : | 546.80/sq mi |
| Housing Units (2012) : | 3,217 |
| Median Household Income (2012) : | $75,853 (Pennsylvania : $52,267, USA : $53,046) |
| Median Family Income (2012) : | $87,625 (Pennsylvania : $65,980, USA : $64,585) |
| Median House Price (2012) : | $219,000 (Pennsylvania : $164,900, USA : $181,400) |