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Welcome to New Castle ...

The city of New Castle is located in New Castle County<1>.

New Castle was established in 1651.

From the  Census Estimates for 2019, New Castle has a population of 5,414 people<2> (see below for details).

The community of New Castle is near sea level<3>.

Time Zone: New Castle lies in the Eastern Time Zone (EST/EDT) and observes daylight saving time

New Castle is within the (302) area code.

The ZIP codes for New Castle: 19720-19721<4>

Websites for New Castle ...

Official Website:

Population Details ...

Taken from the 2019 Census Estimates, New Castle had an population of 5,414 people. This is an increase of 2.44% since the 2010 Census (or an increase of 11.35% since the 2000 Census).

At the time of the 2010 Census, New Castle had a population of 5,285 people. This makes New Castle the county's 5th most populous community.

The population of New Castle represents 0.59% of the population of Delaware (which has 897,934 people), making it the state's 10th most populous community.

With a 2010 count of 5,285 people, the population of New Castle increased 8.7% from the 2000 Census (with a count of 4,862 people).

More information can be found on the Census Page for New Castle.

Communities Also Named New Castle ...

Using our Gazetteer, we found that there are 19 communities that are also named New Castle - they are located in Alabama, Colorado, Illinois (2), Indiana, Kentucky, Missouri (2), New Hampshire, New York, North Carolina, Ohio (3), Pennsylvania (3), Utah and Virginia.

For more information, see our Tidbits & Trivia Page for New Castle.

Communities near New Castle ...

We have created a list of 10 communities that are near New Castle.

  • Newark
    (10 miles [16.1 km] to the west)
  • Chester
    (17 miles [27.4 km] to the northeast)
  • Middletown
    (16 miles [25.7 km] to the southwest)
  • Elkton
    (14 miles [22.5 km] to the west)
    • Note: The GPS coordinates that we are using for Elkton have been provided by the GNIS.<6> The coordinates still need to be verified.
    • Elkton is located in Cecil County (MD)
    • Population from the 2020 Census: 15,665 people
    • Jump to our Gazetteer entry for Elkton
    • Jump to a Google Map centered on Elkton
    • Jump to TripAdvisor's Tourism page for Elkton <5>
  • Brookhaven
    (17 miles [27.4 km] to the northeast)
    • Note: The GPS coordinates that we are using for Brookhaven have been provided by the GNIS.<6> The coordinates still need to be verified.
    • Brookhaven is located in Delaware County (PA)
    • Population from the 2020 Census: 8,053 people
    • Jump to our Gazetteer entry for Brookhaven
    • Jump to a Google Map centered on Brookhaven
    • Jump to TripAdvisor's Tourism page for Brookhaven <5>
  • Ridley Park
    (19 miles [30.6 km] to the northeast)
  • Kennett Square
    (14 miles [22.5 km] to the northwest)
  • Salem
    (8 miles [12.9 km] to the southeast)
    • Salem is located in Salem County (NJ)
    • Population from the 2020 Census: 4,713 people
    • Jump to our Gazetteer entry for Salem
    • Jump to a Google Map centered on Salem
  • Upland
    (16 miles [25.7 km] to the northeast)
  • West Grove
    (17 miles [27.4 km] to the northwest)
    • Note: The GPS coordinates that we are using for West Grove have been provided by the GNIS.<6> The coordinates still need to be verified.
    • West Grove is located in Chester County (PA)
    • Population from the 2020 Census: 2,838 people
    • Jump to our Gazetteer entry for West Grove
    • Jump to a Google Map centered on West Grove
    • Jump to TripAdvisor's Tourism page for West Grove <5>

To Help With Your Genealogy Research ...

We have a couple of sections for those tracing their genealogy.

We created a list of cemeteries that are in the area around New Castle. Our list includes the location of those cemeteries and we provide an overhead view. See our Cemetery List for New Castle.

Using the information from an 1895 Atlas, we've created a list of communities that were in the area of New Castle. Our list includes information such as whether the 1895 community had a post office or railroad service. See our List of 1890's Communities around New Castle.

We also have a detailed list of newspapers that have been published in the area around New Castle. Our list includes 8 papers. See our Newspapers Page for New Castle.

TripAdvisor Tourism Pages for New Castle ...

Looking for more information about New Castle? A wonderful source is the TripAdvisor website. We always start with the TripAdvisor Tourism page, where you can read an overview with links that will help you find lodging, restaurants and attractions.

In addition to the Tourism page for New Castle, there are neighboring communities that also have Tourism pages. More information about those communities can be found on our TripAdvisor Page for New Castle.

Adding New Castle to Our Gazetteer ...

We originally found mention of New Castle in both the FIPS-55 and the GNIS. For more information, see the FIPS and GNIS Codes sections on our Miscellaneous Page.

From our notes, the earliest published mention we've found for New Castle was in the document titled List of Post Offices from Cameron Blevins and Richard Helbock.<7>

From that list, the New Castle post office opened in 1794.

We also found New Castle in the book titled U.S. Post Offices (1803).

For more details, see References and Mentions for New Castle.

The official website for New Castle:

The official website for New Castle County:

The official website for State of Delaware:

Footnotes ...

<1>If you're interested in how the shape of Delaware's counties, including New Castle, have changed over time, we recommend the Atlas of Historical County Boundaries.
<2>Population counts have been provided by the U.S. Census Bureau. For more detail, please visit our Census Page for New Castle.
<3>The elevation is an estimate for the area around New Castle - it will be higher in some places and lower in others.
<4>ZIP Codes have been created by the United States Postal Service (USPS) as a way of grouping addresses to make delivery more efficient. The boundaries of the ZIP Code can be changed, re-assigned, eliminated or overlapped with other ZIP Codes. So keep in mind that any given ZIP Code is only 'loosely' associated with a city (such as New Castle). When looking for a ZIP Code, whether New Castle or elsewhere, it's always best to check the website of the United States Postal Service (USPS).

Our list of ZIP Codes for New Castle includes: 19720 & 19721.
<5>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.
<6>The location has been supplied by the Geographic Names Information System - which is maintained by the U.S. Geological Survey (USGS). While these values should be definitive, we found that accuracy can vary and you should double-check the location if accuracy is required.
<7>A copy of their list with background information can be found at:




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This page was last modified/updated: 26 Sep 2023