| City : | Irwin Borough |
| County : | Westmoreland County |
| State : | Pennsylvania (PA) |
| | |
| Land Area : | 0.84 sq mi |
| Water Area : | 0.00 sq mi |
| Latitude : | 40.3250660 |
| Longitude : | -79.6997545 |
| | |
| Population (2010): | 3,973 |
| Population Estimate (2012) : | 3,974 |
| Population Density : | 4,746.20/sq mi |
| Housing Units (2012) : | 2,222 |
| Median Household Income (2012) : | $39,283 (Pennsylvania : $52,267, USA : $53,046) |
| Median Family Income (2012) : | $46,554 (Pennsylvania : $65,980, USA : $64,585) |
| Median House Price (2012) : | $131,800 (Pennsylvania : $164,900, USA : $181,400) |