| City : | Middlesex Borough |
| County : | Lake County, Marion County, Middlesex County, Prince George's County |
| State : | New Jersey (NJ) |
| | |
| Land Area : | 3.52 sq mi |
| Water Area : | 0.02 sq mi |
| Latitude : | 40.5746267 |
| Longitude : | -74.4982587 |
| | |
| Population (2010): | 13,635 |
| Population Estimate (2012) : | 13,661 |
| Population Density : | 3,876.22/sq mi |
| Housing Units (2012) : | 5,148 |
| Median Household Income (2012) : | $86,498 (New Jersey : $71,637, USA : $53,046) |
| Median Family Income (2012) : | $101,208 (New Jersey : $87,389, USA : $64,585) |
| Median House Price (2012) : | $332,700 (New Jersey : $337,900, USA : $181,400) |