New Castle ZIP Codes — New Castle County, DE

There are 3 unique ZIP codes in New Castle, Delaware. Area code: 302.

ZIP codes

38.30

sq mi land

3.08

sq mi water

302

area code

New Castle, DE ZIP code map

About New Castle, DE

New Castle, Delaware, is a charming city located within New Castle County. Known for its rich history and well-preserved colonial architecture, New Castle offers a unique glimpse into the past while providing modern amenities. With a welcoming community and vibrant local culture, it serves as both a residential area and a site for tourism.

Location & geography

New Castle is situated in the northern part of Delaware, conveniently located just a short drive from Wilmington, which is approximately 8 miles to the north. The city is bordered by the Delaware River, adding natural beauty to its landscape, while its total area comprises 76.61 square miles of land and 6.15 square miles of water. Nearby cities include Middletown, which is about 10 miles southeast, and Bear, located roughly 6 miles to the south.

Community & economy

The community in New Castle is characterized by a blend of historic charm and modern living, making it an appealing place for both families and retirees. The local economy is supported by various industries, including retail, healthcare, and education, providing residents with essential services and job opportunities. Daily life in New Castle includes enjoying local parks, community events, and proximity to shopping and dining options.

Transportation

Transportation in New Castle is facilitated by major thoroughfares such as Delaware Route 273 and Interstate 95, which connect residents to surrounding areas. The nearest airport is Wilmington Airport, approximately 10 miles to the north, offering flights to various destinations. Public transportation options include local bus services that enhance connectivity within the region.

History

New Castle was founded in the early 17th century by the Dutch, originally as a trading post, and later developed under British rule. Key industries have historically included shipping and trade due to its strategic location along the Delaware River, fostering growth throughout the years. Notable events in the city’s history include its role in the American Revolutionary War and its establishment as one of the earliest colonial capitals.

Did you know?

One surprising fact about New Castle is that it is home to the Old New Castle Historic District, which features a variety of buildings dating back to the 17th century. This area is not only a popular tourist destination but also hosts numerous historical reenactments and events throughout the year.

ZIP codes for New Castle, DE (3)

ZIP code	City	County	Map
19720	New Castle	New Castle	View map
19721	New Castle	New Castle	View map
19726	New Castle	New Castle	View map

Demographics & statistics

60,514

Population

40.1

Median age

$72,424

Median household income

$36,173

Per capita income

$229,300

Median home value

$1,229

Median monthly rent

68.1%

Home ownership

9.7%

Poverty rate

4.7%

Unemployment

17,003

Housing units

21.8%

Bachelor's or higher

Age distribution

Male Female

1,514

Under 5

1,646

1,552

5–9

1,686

2,073

10–14

2,254

1,643

15–19

1,786

1,911

20–24

2,077

3,823

25–34

4,156

4,102

35–44

4,458

3,670

45–54

3,990

2,292

55–59

2,492

2,009

60–64

2,184

2,674

65–74

2,907

1,363

75–84

1,482

369

85+

401

← Male

Female →

Age summary

Group	Count	%
Under 18	12,709	21.0%
18 and over	47,805	79.0%
65 and over	9,196	15.2%
Median age	40.1 years

Race & ethnicity

Black or African American 37.7%

White 37.2%

Hispanic or Latino 10.2%

Other race 7.4%

Two or more races 5.4%

Asian 1.6%

American Indian / Alaska Native 0.3%

Native Hawaiian / Pacific Islander 0.1%

Group	Count	%
Black or African American	25,394	37.7%
White	25,086	37.2%
Hispanic or Latino	6,883	10.2%
Other race	5,016	7.4%
Two or more races	3,658	5.4%
Asian	1,091	1.6%
American Indian / Alaska Native	224	0.3%
Native Hawaiian / Pacific Islander	45	0.1%

Household income

Under $10k 4.2%

$10k–$15k 3.2%

$15k–$25k 5.4%

$25k–$35k 8.0%

$35k–$50k 12.0%

$50k–$75k 19.2%

$75k–$100k 14.1%

$100k–$150k 18.0%

$150k–$200k 9.3%

$200k+ 6.6%

Range	% of households
Under $10k	4.2%
$10k–$15k	3.2%
$15k–$25k	5.4%
$25k–$35k	8.0%
$35k–$50k	12.0%
$50k–$75k	19.2%
$75k–$100k	14.1%
$100k–$150k	18.0%
$150k–$200k	9.3%
$200k+	6.6%
Median income	$72,424

Housing

Home values

Under $50k 3.7%

$50k–$100k 2.7%

$100k–$150k 9.5%

$150k–$200k 21.6%

$200k–$300k 35.3%

$300k–$500k 23.0%

$500k–$1M 2.7%

$1M+ 1.5%

Housing overview

Metric	Value
Median home value	$229,300
Median rent / month	$1,229
Owner occupied	68.1%
Renter occupied	31.9%
Vacant	5.3%
Single-family detached	61.8%
Large apartment buildings	3.6%
Mobile homes	1.1%
Median rooms	5.9
Avg household size (owned)	2.69

Year built

Era	%
2020 or later	0.1%
2010–2019	2.9%
2000–2009	8.6%
1990–1999	12.0%
1980–1989	11.5%
1970–1979	13.0%
1960–1969	16.7%
1950–1959	19.1%
1940–1949	9.9%
1939 or earlier	6.3%

Bedrooms

Size	% of units
No bedroom (studio)	0.4%
1 bedroom	10.5%
2 bedrooms	22.7%
3 bedrooms	45.8%
4 bedrooms	18.2%
5+ bedrooms	2.5%

Vehicles per household

Vehicles	% of households
No vehicle	6.5%
1 vehicle	36.0%
2 vehicles	37.3%
3 or more	20.2%

Heating fuel

Fuel type	%
Utility gas	57.1%
Electricity	29.6%
Propane / LP gas	1.1%
Fuel oil	10.3%
Wood	0.2%
Solar	0.5%
No fuel used	1.0%

Households & families

Household type	Count	%
Married-couple family	9,337	40.5%
Cohabiting couple	2,037	8.8%
Male householder, no spouse	4,475	19.4%
Female householder, no spouse	7,228	31.3%
Households with children under 18	6,376	27.6%
Households with seniors (65+)	6,977	30.2%
Average household size	2.59

Marital status

Status	Male	Female
Never married	40.5%	37.2%
Married	45.1%	37.7%
Separated	1.7%	2.3%
Widowed	3.1%	8.5%
Divorced	9.6%	14.3%

Education

Less than 9th grade 4.5%

Some HS, no diploma 6.2%

HS graduate 39.6%

Some college, no degree 19.7%

Associate's degree 8.2%

Bachelor's degree 12.8%

Graduate / professional 9.0%

Metric	%
HS diploma or higher	89.3%
Bachelor's or higher	21.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	809	5.9%
Kindergarten	515	3.7%
Elementary school	5,969	43.3%
High school	2,839	20.6%
College / grad school	3,650	26.5%

Employment

Industry of employment

Education & healthcare 23.6%

Retail trade 11.8%

Professional & management 10.6%

Finance & real estate 8.9%

Transportation & utilities 8.5%

Manufacturing 7.4%

Arts, food & hospitality 7.2%

Public administration 6.6%

Other services 6.1%

Construction 5.4%

Wholesale trade 1.9%

Information 1.5%

Agriculture & mining 0.6%

Occupation

Category	%
Management, business & arts	34.2%
Service	21.6%
Sales & office	20.5%
Natural resources & construction	7.2%
Production & transportation	16.6%

Employment type

Type	%
Private sector	80.8%
Government	15.1%
Self-employed	4.1%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	73.8%
Carpool	9.2%
Public transit	2.6%
Walk	2.2%
Other means	0.8%
Avg commute (minutes)	25.4

Poverty

All people 9.7%

Under 18 years 12.1%

18 and over 9.0%

Married-couple families 3.2%

Female-led households 12.6%

Income support

Source	% of households
Social Security	30.9%
Retirement income	28.9%
Supplemental Security	5.2%
Cash public assistance	2.7%
Food stamps / SNAP	10.6%

Health indicators

Condition	%
High blood pressure	35.4%
High cholesterol	30.6%
Heart disease	5.8%
Stroke	3.2%
Asthma	11.2%
Arthritis	22.3%
Kidney disease	2.9%
Pulmonary disease	6.3%
Cancer	5.5%

Behavior / access	%
Binge drinking	16.4%
No physical activity	26.8%
Less than 7 hrs sleep	37.0%
Fair or poor health	16.0%
Poor mental health	14.7%
Poor physical health	11.0%
No health insurance	16.7%
Visited doctor (checkup)	74.8%
Visited dentist	61.5%
Cholesterol screening	89.6%
Teeth loss	14.3%

Veterans & disability

Veterans	Count	%
Civilian veterans	3,155	6.6%

Disability	%
Any disability	14.9%
Under 18	5.9%
18–64 years	13.3%
65 and over	33.9%

Health insurance coverage

Type	%
Private insurance	68.9%
Public insurance	39.2%
Uninsured under 19	3.3%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	57,354	94.8%
Spanish	3,376	5.9%
Other Indo-European	2,736	4.8%
Asian & Pacific Islander	135	0.2%
Other languages	210	0.4%

Place of birth & citizenship

Origin	Count	%
Native born (US)	53,518	88.4%
Born in same state	51,668	85.4%
Born in different state	27,734	45.8%
Foreign born	1,850	3.1%
Naturalized citizen	6,996	11.6%
Not a US citizen	4,254	60.8%

Ancestry

Ancestry	Count	%
Italian	5,136	8.5%
French	3,880	6.4%
Arab	1,876	3.1%
English	330	0.5%
Polish	293	0.5%

Ancestry	Count	%
German	153	0.3%
Irish	97	0.2%
Norwegian	56	0.1%
Dutch	23	0%

Technology access

Metric	% of households
Computer access	38.1%
Internet access	95.9%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions

What ZIP codes does New Castle, DE have?

New Castle, DE has 3 ZIP codes: 19720, 19721, and 19726. Each ZIP code serves a distinct delivery area within the city and surrounding region.