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| City : | Clark Borough |
| County : | Mercer County |
| State : | Pennsylvania (PA) |
| Land Area : | 3.01 sq mi |
| Water Area : | 0.61 sq mi |
| Latitude : | 41.2862106 |
| Longitude : | -80.4038868 |
| Population (2010): | 640 |
| Population Estimate (2012) : | 584 |
| Population Density : | 212.58/sq mi |
| Housing Units (2012) : | 243 |
| Median Household Income (2012) : | $66,250 (Pennsylvania : $52,267, USA : $53,046) |
| Median Family Income (2012) : | $70,781 (Pennsylvania : $65,980, USA : $64,585) |
| Median House Price (2012) : | $166,600 (Pennsylvania : $164,900, USA : $181,400) |