New Castle County, Delaware Population 2021

New Castle County, Delaware's estimated population is 561,159 with a growth rate of 0.21% in the past year according to the most recent United States census data. New Castle County, Delaware is the null largest county in Delaware. The 2010 Population was 538,752 and has seen a growth of 4.16% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Growth Rate
2021561,1591,2030.21%
2020559,9561,2030.22%
2019558,7531,2030.22%
2018557,5501,5740.28%
2017555,9769180.17%
2016555,0581,5700.28%
2015553,4882,7200.49%
2014550,7682,4370.44%
2013548,3313,4830.64%
2012544,8482,9390.54%
2011541,9093,1570.59%
2010538,75296,80621.90%
1990441,94643,83111.01%
1980398,11512,2593.18%
1970385,85678,41025.50%
1960307,44688,56740.46%
1950218,87939,31721.90%
1940179,56218,53011.51%
1930161,03212,7938.63%
1920148,23925,05120.34%
1910123,18813,49112.30%
1900109,69712,51512.88%
189097,18219,46625.05%
188077,71614,20122.36%
187063,5158,71815.91%
186054,79712,01728.09%
185042,7809,66029.17%
184033,1203,40011.44%
183029,7201,8216.53%
182027,8993,47014.20%
181024,429-932-3.67%
180025,3615,67328.81%
179019,6880.00%
2021 Growth Rate
0.21%
County Website
Founded
August 8, 1637
County Seat
2010 Population
538,752
Growth Since 2010
4.16%
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New Castle County, Delaware Population Growth

Population by Race

Race Population Percentage
White357,18564.22%
Black or African American139,96025.17%
Asian30,7045.52%
Two or More Races14,5942.62%
Some Other Race11,8772.14%
American Indian and Alaska Native1,6630.30%
Native Hawaiian and Other Pacific Islander1820.03%
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New Castle County, Delaware Population By Race

New Castle County, Delaware Population Pyramid 2021

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New Castle County, Delaware Median Age

38.4


Total

36.9


Male

39.9


Female

New Castle County, Delaware Adults

There are 435,516 adults, (84,268 of whom are seniors) in New Castle County, Delaware.

New Castle County, Delaware Age Dependency

58.3

Age Dependency Ratio

24

Old Age Dependency Ratio

34.3

Child Dependency Ratio

New Castle County, Delaware Sex Ratio

Mujer

286,976

51.60%

Masculino

269,189

48.40%

New Castle County, Delaware Population by Age

New Castle County, Delaware Renter vs Owner Occupied by Household Type

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New Castle County, Delaware Household Types

Type Owner Renter
Married84.1%15.9%
All67.9%32.1%
Masculino59.4%40.6%
Mujer53.5%46.5%
Non Family53.2%46.8%

67.9%

Rate of Home Ownership

New Castle County, Delaware Households and Families

Type Count Average Size Owned
All205,8292.6267.9
Married95,5203.2784.1
Non Family73,6151.353.2
Mujer26,8513.5653.5
Masculino9,8433.6159.4

3.27

Average Family Size

2.62

Average Household Size

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New Castle County, Delaware Households by Type

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Education Attained Count Percentage
Less Than 9th Grade11,4983.00%
9th to 12th Grade20,5345.36%
High School Graduate118,23330.84%
Some College67,55317.62%
Associates Degree26,8817.01%
Bachelors Degree80,15820.91%
Graduate Degree58,46915.25%
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New Castle County, Delaware Educational Attainment by Sex (over 25)

New Castle County, Delaware Educational Attainment by Race

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Race Total High School Bachelors
White237,228225,17094,126
Black91,35883,73423,237
Hispanic29,94119,2294,822
Asian21,03019,56714,632
Other Race6,8824,345881
2+ Races5,1164,6412,096
Native American1,175959298
Islander12811311

The highest rate of high school graduation is among white people with a rate of 94.92%.

The highest rate of bachelors degrees is among asian people with a rate of 69.58%.

New Castle County, Delaware Educational Attainment by Race

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Name Average Masculino Mujer
Overall$47,152$53,204$40,967
Less Than 9th Grade$27,083$30,607$21,728
High School Graduate$34,210$41,773$29,493
Some College$41,855$49,740$36,541
Bachelors Degree$61,986$72,121$53,178
Graduate Degree$77,328$92,507$68,481

$47,152

Average Earnings

$53,204

Average Male

$40,967

Average Female

New Castle County, Delaware Earnings by Educational Attainment

New Castle County, Delaware Language by Age

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New Castle County, Delaware Language

84.93% of New Castle County, Delaware residents speak only English, while 15.07% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 7.62% of the population.

New Castle County, Delaware Language

New Castle County, Delaware Poverty by Race

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Name Total In Poverty Poverty Rate
Black134,73324,13817.92%
White309,53522,3037.21%
Hispanic53,94910,41319.30%
Asian30,2663,35911.10%
Other11,5162,58222.42%
Multiple14,2812,05014.35%
Native1,63319712.06%
Islander176105.68%

11.38%

Overall Poverty Rate

10.27%

Male Poverty Rate

12.40%

Female Poverty Rate

Poverty in New Castle County, Delaware

The race most likely to be in poverty in New Castle County, Delaware is Other, with 22.42% below the poverty level.

The race least likely to be in poverty in New Castle County, Delaware is Islander, with 5.68% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.70%. Among those working part-time, it was 15.49%, and for those that did not work, the poverty rate was 19.21%.

New Castle County, Delaware Poverty

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Name Poverty
Less Than 9th Grade19.60%
High School12.99%
Some College8.12%
Bachelors or Greater3.72%

New Castle County, Delaware Poverty Rate by Education

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Name Poverty
Female Unemployed29.84%
Male Unemployed24.70%
Female Employed5.88%
Male Employed4.14%

New Castle County, Delaware Poverty Rate by Employment Status and Sex

New Castle County, Delaware Income by Household Type

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Name Median Mean
Households$73,892$97,068
Families$91,568$115,690
Married Families$109,445$135,203
Non Families$43,916$60,023
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Income by Household Type

New Castle County, Delaware Marital Status

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Marriage Rates

45.0%

Overall Marriage Rate

47.5%

Male Marriage Rate

42.8%

Female Marriage Rate

New Castle County, Delaware Married by Age and Sex

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New Castle County, Delaware Marriage

The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 45-54.

New Castle County, Delaware Marital Status by Race

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New Castle County, Delaware Marital Status

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30,043

Number of Veterans

27,305

Male Veterans

2,738

Female Veterans

War Veterans
Vietnam10,843
First Gulf War5,877
Second Gulf War4,808
Korea2,270
World War II980

New Castle County, Delaware Veterans by War

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Age Group Veterans
65 to 748,402
75+6,965
35 to 546,653
55 to 646,232
18 to 341,791

New Castle County, Delaware Veterans by Age

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Name Veterans % of Total
White20,7277.17%
Black8,4458.04%
Hispanic1,2783.54%
2+ Races3434.73%
Asian3191.34%
Other Race1191.45%
Native American876.38%
Islander32.27%

New Castle County, Delaware Veterans by Race

New Castle County, Delaware Veterans by Education

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6.21%

Veteran Poverty Rate

23.91%

Veteran Disability Rate

New Castle County, Delaware Veterans by Education

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65.4%

Labor Force Participation

61.4%

Employment Rate

5.9%

Unemployment Rate

New Castle County, Delaware Employment by Age

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New Castle County, Delaware Employment by Race

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New Castle County, Delaware Employment by Education

Origin of Non-Citizens

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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

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46.16%

Born in New Castle County, Delaware

88.48%

Native Born

11.52%

Foreign Born

5.96%

Non Citizen

5.56%

Naturalized

Place of Birth

88.48% of New Castle County, Delaware residents were born in the United States, with 46.16% having been born in Delaware. 5.96% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

New Castle County, Delaware Place of Birth

  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990

Sources