19721 ZIP Code — New Castle, DE
New Castle County, Delaware
ZIP code 19721 is located in New Castle, Delaware, within New Castle County. It covers approximately 0.00 square miles and serves a population of 0 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 302.
0
population
0.00
sq mi land
Standard
ZIP type
Eastern (ET)
timezone
19721 ZIP code map
Cities in ZIP code 19721
Below are the cities the US Postal Service accepts for ZIP code 19721. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| New Castle | Acceptable |
| New Castle | Preferred |
Nearby ZIP codes
19720 New Castle (2 mi)
08070 Pennsville (3.9 mi)
19804 Wilmington (4.8 mi)
19801 Wilmington (4.8 mi)
19886 Wilmington (5.9 mi)
19891 Wilmington (5.9 mi)
19893 Wilmington (5.9 mi)
19885 Wilmington (5.9 mi)
19884 Wilmington (5.9 mi)
19892 Wilmington (5.9 mi)
19890 Wilmington (5.9 mi)
19895 Wilmington (5.9 mi)
Demographics
updated 06/2026
| Population | |
|---|---|
| Total population | 0 |
| Population density | 0 / sq mi |
| State FIPS | 10 |
| County FIPS | 003 |
| Geography | |
|---|---|
| Land area | 0.00 sq mi |
| Water area | 0.00 sq mi |
| Latitude | 39.6618 |
| Longitude | -75.5664 |
| Timezone | Eastern (ET) |
| Area code | 302 |