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The City of New Castle is located in New Castle County in the state of Delaware (DE).

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New Castle is a city in New Castle County, Delaware, six miles (10 km) south of Wilmington, situated on the Delaware River. In 1900, 3,380 people lived here; in 1910, 3,351. According to the 2010 Census, the population of the city is 5,285.

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County Level News: New Castle County News
State Level News: State of Delaware News
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New Castle, DE Map (Interactive)

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New Castle Latitude: 39.6483 Longitude: -75.6041
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The The Zip Codes for New Castle, DE are:
19720, 19721

The City of New Castle

Facts & Data:

New Castle Delaware Physical Characteristics:

The City of New Castle has an area of 3.5 square miles
  • Land: 3.3989521235521 Sq. Mi. (96.48%)
  • Water: 0.12390154440154 Sq. Mi.(3.52%)
The New Castle City takes up 0.7% of the area of New Castle County.

Map Location Coordinates:

  • Latitude: +39.6698127
  • Longitude: -075.5662733
New Castle Land Water Pie Chart

New Castle, DE Climate Information:

  • Average Temperature: 54.9°F
  • Average Rainfall: 43.08 inches
  • Average Snowfall: 20.2 inches
*Based on annual average for Weather Station USW00013781 WILMINGTON NEW CASTLE CO AP
Latitude: 39.6728 Longitude: -75.6008 Elevation: 24.1 feet.

New Castle, DE Population Data:

According to the 2010 U.S. Census, the population of New Castle was 5,285 people, which is 1.0 % of the entire population of New Castle County.


  • 45.73% Male
  • 54.27% Female


  • 67.342% White
  • 27.152% Black
  • 1.154% Asian
  • 0.34% American Indian/Alaskan Native
  • 0.00% Pacific Islander
  • 2.611% Mixed
  • 1.400% Other


  • 94.55% Not Hispanic or Latino
  • 5.45% Hispanic or Latino
New Castle Race Population Ring Chart

New Castle, DE Housing Information:

Average Household Size: 2.3
Number of Residences: 2,497
  • Occupied: 2,331 (93.35%)
  • Vacant: 166 (6.65%)
Spotlight Left New Castle Business Spotlight
Geo-Technology Assoc Inc
871118 - Engineers-Geological
18 Boulden Cir # 34, New Castle, Delaware 19720-3494
Chris Reith (302) 326-2100 (302) 326-2399
See more in the New Castle Business Directory
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