🇺🇸 United States ZIP Code

STANDARD

19720

New Castle

ZIP Code 19720 is a standard zip code serving New Castle, New Castle, Delaware (DE), in New Castle County, United States. It has an estimated population of 59,250 with a median household income of $54,233. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Delaware (DE)
County: New Castle
City: New Castle
Timezone: America/New_York

Coordinates

Latitude: 39.592900
Longitude: -75.651500

Geographic Details

Land Area: 37.10 mi²
Water Area: 3.89 mi²
Population Density: 1597.0 people per mi² (80th percentile)
Bounding Box: 39.724774°N, 39.552808°S, -75.521385°E, -75.664947°W

With 59,250 residents spread across 37.10 square miles, this area has a population density of 1597.0 people per square mile.

Demographics

59,250

Population

95th percentile

$54,233

Median Income

60th percentile

$190,700

Median Home Value

70th percentile

37.10 mi²

Land Area

The median household income in 19720 is $54,233, and the median home value is $190,700.

Housing

22,765

Total Units

21,373

Occupied Units

93.9%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in New Castle, DE.

19721

New Castle

19726

New Castle

Similar ZIP Codes in Delaware

ZIP codes with similar median household income in Delaware.

19953

Hartly

$56,205

19703

Claymont

$51,739

19904

Dover

$54,368

19804

Wilmington

$53,809

19713

Newark

$57,044

19977

Smyrna

$59,519

19809

Wilmington

$60,726

19958

Lewes

$54,938

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.