New Castle County, Delaware Population 2024

581,054

New Castle County, Delaware's estimated 2024 population is 581,054 with a growth rate of 0.48% in the past year according to the most recent United States census data. New Castle County, Delaware is the largest county in Delaware. The 2010 population was 538,792 and has seen a growth of 7.84% since that time.

Note: data after 2022 is projected based on recent change

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Year
Population
Growth
Growth Rate
2029594,9542,7800.47%
2028592,1742,7800.47%
2027589,3942,7800.47%
2026586,6142,7800.48%
2025583,8342,7800.48%
2024581,0542,7800.48%
2023578,2742,7800.48%
2022575,4942,7800.49%
2021572,7141,8410.32%
2020570,87310,9321.95%
2019559,9411,9580.35%
2018557,9831,4920.27%
2017556,4919090.16%
2016555,5821,6530.3%
2015553,9292,8050.51%
2014551,1242,5100.46%
2013548,6143,5610.65%
2012545,0533,0220.56%
2011542,0313,2390.6%
2010538,792
1990441,94643,83111.01%
1980398,11512,2593.18%
1970385,85678,41025.5%
1960307,44688,56740.46%
1950218,87939,31721.9%
1940179,56218,53011.51%
1930161,03212,7938.63%
1920148,23925,05120.34%
1910123,18813,49112.3%
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%
182027,8993,47014.2%
181024,429-932-3.67%
180025,3615,67328.81%
179019,688-575,266-96.69%
showing: 41 rows
2024 Growth Rate
0.48% (2,780)
County Website
New Castle County
County Seat
2010 Population
538,792
Area
426 mi²
Density
1364 people/mi²
Growth Since 2010
7.84% (42,262)
Founded
August 8, 1637

New Castle County, Delaware Population 2024

Population by Race

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Race
Population
Percentage (of total)
White334,33358.6%
Black or African American144,39325.31%
Two or more races35,3706.2%
Asian33,2395.83%
Other race21,9233.84%
Native American1,1210.2%
Native Hawaiian or Pacific Islander1880.03%
showing: 7 rows

White

Black or African American

Two or more races

Asian

Other race

Native American

Native Hawaiian or Pacific Islander

New Castle County, Delaware Population by Race

New Castle County, Delaware Population Pyramid 2024

New Castle County, Delaware Median Age

39

Total

37.8

Male

40.5

Female

New Castle County, Delaware Adults

There are 449,114 adults, (92,683 of whom are seniors) in New Castle County, Delaware.

New Castle County, Delaware Age Dependency

60.1

Age Dependency Ratio

26

Old Age Dependency Ratio

34.1

Child Dependency Ratio

New Castle County, Delaware Sex Ratio

Female293,00951.35%
Male277,55848.65%

New Castle County, Delaware Population by Age

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

Household Type
Count
Average Size
Owner
Renter
All220,4372.5268.231.8
Married98,1953.1885.814.2
Non Family82,4501.2752.647.4
Female28,2773.5552.847.2
Male11,5153.2866.833.2
showing: 5 rows

3.17

Average Family Size

2.52

Average Household Size

68.2%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

New Castle County, Delaware Households and Families

Male

Female

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Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

New Castle County, Delaware Educational Attainment by Sex (over 25)

New Castle County, Delaware Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

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The highest rate of high school graduation is among white people with a rate of 95.58%.

The highest rate of bachelors degrees is among asian people with a rate of 70.63%.

New Castle County, Delaware Educational Attainment by Race

All

Male

Female

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$55,017

Average Earnings

$61,366

Average Male

$47,867

Average Female

New Castle County, Delaware Earnings by Educational Attainment

New Castle County, Delaware Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

New Castle County, Delaware Language

84.14% of New Castle County, Delaware residents speak only English, while 15.86% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 7.89% of the population.

New Castle County, Delaware Language

New Castle County, Delaware Poverty by Race

rate

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Name
Total
In Poverty
Poverty Rate
Black140,25822,26515.87%
White301,71620,9796.95%
Hispanic60,6009,45215.6%
Multiple34,8084,76713.7%
Other21,4944,41020.52%
Asian32,7243,1529.63%
Native1,06820419.1%
Islander1882010.64%
showing: 8 rows

10.52%

Overall Poverty Rate

9.47%

Male Poverty Rate

11.51%

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 20.52% below the poverty level.

The race least likely to be in poverty in New Castle County, Delaware is White, with 6.95% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.58%. Among those working part-time, it was 13.39%, and for those that did not work, the poverty rate was 18.76%.

New Castle County, Delaware Poverty

rate

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Rate
Poverty
Less Than 9th Grade19.65%
High School12.13%
Some College7.41%
Bachelors or Greater3.87%
showing: 4 rows

New Castle County, Delaware Poverty Rate by Education

rate

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Rate
Poverty
Female Unemployed28.7%
Male Unemployed24.09%
Female Employed5.51%
Male Employed3.54%
showing: 4 rows

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

New Castle County, Delaware Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

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mean

median

Income by Household Type

New Castle County, Delaware Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

45.0%

Overall Marriage Rate

48.1%

Male Marriage Rate

42.2%

Female Marriage Rate

New Castle County, Delaware Married by Age and Sex

male

female

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

Married

Widowed

Divorced

Separated

NeverMarried

New Castle County, Delaware Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

28,398

Number of Veterans

25,776

Male Veterans

2,622

Female Veterans

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New Castle County, Delaware Veterans by War

count

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New Castle County, Delaware Veterans by Age

count

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New Castle County, Delaware Veterans by Race

New Castle County, Delaware Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

5.66%

Veteran Poverty Rate

28.73%

Veteran Disability Rate

New Castle County, Delaware Veterans by Education

LaborForceParticipation

66.1%

Labor Force Participation

62.3%

Employment Rate

5.4%

Unemployment Rate

New Castle County, Delaware Employment by Age

LaborForceParticipation

New Castle County, Delaware Employment by Race

LaborForceParticipation

New Castle County, Delaware Employment by Education

Origin of Non-Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

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

Origin of Naturalized Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

45.07%

Born in New Castle County, Delaware

88.22%

Native Born

11.78%

Foreign Born

5.36%

Non Citizen

6.42%

Naturalized

Place of Birth

88.22% of New Castle County, Delaware residents were born in the United States, with 45.07% having been born in Delaware. 5.36% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

New Castle County, Delaware Place of Birth

Sources