| County : | New Castle County |
| State : | Delaware (DE) |
| Land Area : | 426.28 sq mi |
| Water Area : | 67.72 sq mi |
| Latitude : | 39.5759152 |
| Longitude : | -75.6441324 |
| Population (2010): | 538,479 |
| Population Estimate (2012) : | 539,665 |
| Population Density : | 1,263.20/sq mi |
| Housing Units (2012) : | 217,511 |
| Median Household Income (2012) : | $64,670 (Delaware : $60,119, USA : $53,046) |
| Median Family Income (2012) : | $79,821 (Delaware : $72,069, USA : $64,585) |
| Median House Price (2012) : | $251,200 (Delaware : $241,100, USA : $181,400) |
New Castle County Cities / Towns
| Arden Village (439) | Ardencroft Village (231) | Ardentown Village (264) |
| Bear (19,371) | Bellefonte Town (1,193) | Brookside (14,353) |
| Claymont (8,253) | Delaware City (1,695) | Edgemoor (5,677) |
| Elsmere Town (6,131) | Glasgow (14,303) | Greenville (2,326) |
| Hockessin (13,527) | Middletown Town (18,871) | Newark City (31,454) |
| New Castle City (5,285) | Newport Town (1,055) | North Star (7,980) |
| Odessa Town (364) | Pike Creek (7,898) | Pike Creek Valley (11,217) |
| Smyrna Town (10,023) | Townsend Town (2,049) | Wilmington City (70,851) |
| Wilmington Manor (7,889) |
New Castle County Zip Codes
| 19701 (39,194) | 19702 (51,899) | 19703 (14,471) |
| 19706 (1,822) | 19707 (16,483) | 19709 (35,107) |
| 19710 (41) | 19711 (51,322) | 19713 (30,408) |
| 19716 (1,568) | 19717 (3,770) | 19720 (59,250) |
| 19730 (451) | 19731 (252) | 19732 (25) |
| 19733 (110) | 19734 (11,651) | 19735 (12) |
| 19736 (32) | 19801 (16,286) | 19802 (24,621) |
| 19803 (21,364) | 19804 (17,944) | 19805 (40,937) |
| 19806 (9,560) | 19807 (7,405) | 19808 (38,442) |
| 19809 (14,049) | 19810 (25,011) | 19938 (8,357) |
| 19977 (22,984) | 21912 (1,240) |