New Castle County, Delaware Population 2020

New Castle County, Delaware's estimated population is 556,419 with a growth rate of 0.18% in the past year according to the most recent United States census data. New Castle County, Delaware is the largest county in Delaware.

Year Population Growth Growth Rate
2018559,3352,9160.52%
2017556,4191,0160.18%
2016555,4031,7450.32%
2015553,6582,8070.51%
2014550,8512,4680.45%
2013548,3833,5220.65%
2012544,8612,9950.55%
2011541,8663,1160.58%
2010538,75096,80421.90%
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%

How Many People Live in New Castle County, Delaware?

556,419

New Castle County, Delaware Population Growth

Population by Race

Race Population Percentage
White358,18364.52%
Black or African American138,60824.97%
Asian30,5935.51%
Two or More Races13,8472.49%
Some Other Race12,2862.21%
American Indian and Alaska Native1,4340.26%
Native Hawaiian and Other Pacific Islander1820.03%

New Castle County, Delaware Population Pyramid 2020

New Castle County, Delaware Median Age

38.1


Total

36.7


Male

39.6


Female

New Castle County, Delaware Adults

There are 433,949 adults, (81,440 of whom are seniors) in New Castle County, Delaware.

New Castle County, Delaware Age Dependency

57.5

Age Dependency Ratio

23.1

Old Age Dependency Ratio

34.4

Child Dependency Ratio

New Castle County, Delaware Sex Ratio

Female

286,263

51.57%

Male

268,870

48.43%

New Castle County, Delaware Households and Families

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

New Castle County, Delaware Household Types

Type Owner Renter
Married84.2%15.8%
All68%32%
Male60.6%39.4%
Female53.5%46.5%
Non Family53.2%46.8%

68.0%

Rate of Home Ownership

Type Count Average Size Owned
All203,8552.6468
Married95,0143.2984.2
Non Family71,9971.3153.2
Female27,0363.5453.5
Male9,8083.660.6

3.28

Average Family Size

2.64

Average Household Size

6.1%

Unmarried (Opposite Sex)

0.3%

Unmarried (Same Sex)

New Castle County, Delaware Education

Education Attained Count Percentage
Less Than 9th Grade11,3032.97%
9th to 12th Grade21,1825.57%
High School Graduate116,38730.59%
Some College68,34017.96%
Associates Degree26,6427.00%
Bachelors Degree79,17520.81%
Graduate Degree57,43815.10%

New Castle County, Delaware Educational Attainment by Race

Name Total High School Bachelors
White237,853225,04793,426
Black89,59281,53322,357
Hispanic29,10119,1154,669
Asian20,79419,33114,757
Other Race7,1354,538832
Multiple Races4,5464,0861,713
Native American1,054902346
Islander12210834

The highest rate of high school graduation is among white people with a rate of 94.62%.

The highest rate of bachelors degrees is among asian people with a rate of 70.97%.

Name Average Male Female
Overall$45,562$52,033$40,078
Less Than High School$26,565$29,732$21,296
High School Grad$33,050$40,326$27,731
Some College$40,726$47,257$35,380
Bachelors Degree$59,834$70,091$51,767
Graduate Degree$75,769$91,563$66,270

$45,562

Average Earnings

$52,033

Average Male

$40,078

Average Female

New Castle County, Delaware Language

New Castle County, Delaware Language by Age

New Castle County, Delaware Language

85.13% of New Castle County, Delaware residents speak only English, while 14.87% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 7.52% of the population.

New Castle County, Delaware Poverty

New Castle County, Delaware Poverty by Race

Name Total In Poverty Poverty Rate
Black133,51524,63018.45%
White312,48522,7227.27%
Hispanic52,69910,22719.41%
Asian30,1622,6488.78%
Other11,9792,50320.89%
Multiple13,4942,26216.76%
Native1,39717812.74%
Islander17284.65%

11.43%

Overall Poverty Rate

10.44%

Male Poverty Rate

12.35%

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 20.89% below the poverty level.

The race least likely to be in poverty in New Castle County, Delaware is Islander, with 4.65% 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 15.28%, and for those that did not work, the poverty rate was 19.20%.

Name Poverty
Less Than High School19.95%
High School12.82%
Some College8.12%
Bachelors or Greater3.65%

New Castle County, Delaware Income

New Castle County, Delaware Income by Household Type

Name Median Mean
Households$70,996$93,429
Families$88,300$111,146
Married Families$106,081$130,036
Non Families$41,235$57,591

New Castle County, Delaware Marital Status

New Castle County, Delaware Marital Status

Marriage Rates

45.0%

Overall Marriage Rate

47.0%

Male Marriage Rate

43.1%

Female Marriage Rate

New Castle County, Delaware Married by Age and Sex

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

New Castle County, Delaware Veterans

30,845

Number of Veterans

28,006

Male Veterans

2,839

Female Veterans

War Veterans
Vietnam11,003
First Gulf War5,752
Second Gulf War4,681
Korea2,526
World War II1,190
Name Veterans % of Total
White21,9717.59%
Black7,9727.69%
Hispanic1,4644.15%
Asian3261.37%
2 or More2944.59%
Other1501.75%
Indian1048.46%
Hawaiian2822.40%

$New Castle County, Delaware Veterans by Education

5.62%

Veteran Poverty Rate

23.82%

Veteran Disability Rate

New Castle County, Delaware Employment Status

65.3%

Labor Force Participation

61.1%

Employment Rate

6.3%

Unemployment Rate

New Castle County, Delaware Place of Birth

Origin of Non-Citizens

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

Origin of Naturalized Citizens

46.14%

Born in Delaware

88.87%

Native Born

11.13%

Foreign Born

5.78%

Non Citizen

Place of Birth

88.87% of New Castle County, Delaware residents were born in the United States, with 46.14% having been born in Delaware. 5.78% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

  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