New Castle County, Delaware

New Castle County: County in Delaware, United States

About

New Castle County is a county located in the U.S. state of Delaware. As of the 2010 census, the population was 538,479 and a population density of 421 people per km². After 10 years in 2020 county had an estimated population of 561,531 inhabitants. Its county seat is Wilmington. The county was created 361 years ago in 1663.

New Castle County locator map
Location of New Castle County on Delaware map.

Quick Facts about New Castle County

Population : 561,531 (2020)
Country : United States of America
State : Delaware (United States)
Twitter username : nccde
Area : 1278 km2
Water as percent of area : 13.8%
Land as percent of area : 86.2%
Named for : New Castle
Altitude : 223 feet / 68 meters
Capital : Wilmington
Establishment : January 01, 1664
Time Zone : America/New_York
Local time : 03:59:15 (22nd February 2025)
Density : 439 Pop. per km² as of 2020
Population growth : 4.11% (2010-2020)
Habs new castle county court house image
Habs new castle county court house
Habs new castle county court house image
Habs new castle county court house image

Geography

New Castle County is located at 39°34'42"N 75°38'20"W (39.5783300, -75.6389800). It has 7 neighbors: Kent County, Cecil County, Kent County, Gloucester County, Salem County, Chester County and Delaware.

New Castle County map

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The largest city of New Castle County is Wilmington with a population of 70,376. Other cities include, Newark population 33,849, New Castle population 5,394, Delaware City population 1,837 and Ardentown population 274. See all New Castle County cities & populated places.

New Castle County Populated Places (more)

Cities, towns, neighborhoods & other populated places in New Castle County.

City Name Population Title
Wilmington 70,376 The largest city in New Castle County, Delaware.
Newark 33,849 City in New Castle County, Delaware, United States
Middletown 23,765 Town in Delaware, USA
Bear 19,371 Census-designated place in Delaware, United States
Hockessin 13,527 Census designated place
Claymont 8,253 Census-designated place in Delaware
North Star 7,980 Census designated place
Pike Creek 7,898 Census designated place
Wilmington Manor 7,889 Census-designated place in Delaware
Elsmere 5,761 Town in Delaware
Edgemoor 5,677 Census designated place
New Castle 5,394 City in Delaware
Brookside 2,896 Town in Alabama
Townsend 2,764 Town in New Castle County, Delaware, United States
Delaware City 1,837 City in New Castle County, Delaware, United States
Bellefonte 1,166 Town of the United States

New Castle County has 7 neighbours.

Demographics

The population of New Castle County increased by 4.11% in 10 years.

Year Population % Change Method
2010 538,479 - census
2011 541,909 0.63% estimation process
2012 544,848 0.54% estimation process
2013 548,331 0.64% estimation process
2014 550,768 0.44% estimation process
2015 553,488 0.49% estimation process
2016 555,058 0.28% estimation process
2017 555,976 0.17% estimation process
2018 557,550 0.28% estimation process
2019 558,753 0.22% estimation process
2020 561,531 0.49% estimation process

Comitatul New Castle, Comte de New Castle, Comté de New Castle, Condado de New Castle, Condado han New Castle, Contea di New Castle, Hrabstwo New Castle, Konteth New Castle, N'ju-Kasl, New Castle, New Castle Coonty, New Castle County, New Castle Kun, New Castle Kūn, New Castle konderria, New Castle megye, New Castle okrug, New Castlei maakond, New Castlen piirikunta, Newcastle County, Nju Kasul, Okrug NJu Kasl, Quan New Castle, Quận New Castle, ni'u kyasela ka'unti, niu ka si er xian, nyukyassuru jun, shhrstan nyw kstl dlawyr, Нью-Касл, Ню Касъл, Округ Њу Касл, Նյու Քասլ շրջան, شهرستان نیو کستل، دلاویر, مقاطعة نيو كاسل, نیو کاسل کاؤنٹی, نیو کیسل کاؤنٹی، ڈیلاویئر, নিউ ক্যাসেল কাউন্টি, ニューキャッスル郡, 紐卡斯爾縣

People born in New Castle County (16)

People born in New Castle County, including naval officer Thomas Macdonough, politician 1742-1797 Gunning Bedford, politician Benjamin T. Biggs, .

List

  • William Medill (American governor of Ohio (1802-1865)) he was born in 01/02/1802
  • Charles Thomas (American politician, Governor of Delaware (1790-1848)) he was born in 23/06/1790
  • John Clark (American farmer and politician (1761-1821)) he was born in 01/02/1761
  • Alfred D. Chandler, Jr. (American historian) he was born in 15/09/1918
  • Franklin Brockson (American politician (1865-1942)) he was born in 06/08/1865
  • L. Heisler Ball (American politician) he was born in 21/09/1861
  • Frisby McCullough (Confederate Army officer) he was born in 08/03/1828
  • James Sykes (American politician) he was born in 01/07/1725
  • Lewis E. Eliason (American politician) he was born in 15/09/1850
  • Samuel Davies (American minister and educator) he was born in 03/11/1723
  • Eugene du Pont (American businessman) he was born in 16/11/1840
  • Lammot du Pont I (American businessman) he was born in 01/01/1831
  • John Plankinton (American businessman and meatpacking industrialist who helped finance the construction of many buildings in Milwaukee, Wisconsin) he was born in 11/03/1820

Delaware Other Counties (more counties)

County Name Population Title
Sussex County 241,635 County in Delaware, United States
Kent County 183,643 County in Delaware, United States
Wilmington 70,376 The largest city in New Castle County, Delaware.
Dover 38,199 City in and county seat of Kent County, Delaware, United States, and capital city of Delaware
Newark 33,849 City in New Castle County, Delaware, United States
Middletown 23,765 Town in Delaware, USA
Bear 19,371 Census-designated place in Delaware, United States
Hockessin 13,527 Census designated place
Milford 12,278 City in Kent and Sussex counties, Delaware, United States of America
Smyrna 12,163 Town in Delaware
Claymont 8,253 Census-designated place in Delaware
Seaford 8,246 City in Delaware, United States
North Star 7,980 Census designated place
Pike Creek 7,898 Census designated place
Wilmington Manor 7,889 Census-designated place in Delaware
Georgetown 7,797 Town in Sussex County, Delaware, United States