New Castle County GIS Maps
New Castle County, Delaware, has 570,719 residents and covers 426.3 square miles. The population grew 6% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for New Castle County is 10003.
Wilmington is the county's largest population center. New Castle County also includes 29 zip codes, 6 public school districts and 21 municipalities. Those boundaries help explain why population, schools, and housing can look different from one part of the county to another. The map below shows how those county lines, zip codes, and school districts fit together, and the sections that follow use that same geography to show population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers and sample data. Paid packages add full layers, analytics and database files.
New Castle County Trends
- Population
- 570,719▴
- Median Home Value
- $329,800▴
- K-12 Enrollment
- 65,106▾
County analytics dashboards with historical trends & projections included in package downloads.
Free starter access previews county maps, lightweight GIS, and sample data. Paid packages unlock full GIS layers, analytics, and database files.
New Castle County Maps
The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.
County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.
New Castle County Population
New Castle County had 570,719 residents in 2020. That was 6% higher than in 2010. New Castle County added 70,454 people between 2000 and 2020, which points to steady long-term growth. Wilmington is the largest city in the county, but it accounts for only about 12% of the total population. The county is fairly spread out, with about 1,339 people per square mile. Some of the county's most populated postal areas include Historic New Castle, Bear and Middletown.
Population Trend in New Castle County DE
New Castle County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
New Castle County Zip Codes
New Castle County has 29 zip codes. Some of the county's most populated zip codes include Historic New Castle (19720), Bear (19702) and Middletown (19709). Historic New Castle is the largest zip by population, with about 61,043 residents or 11% of the county total. Together, the three largest zips account for about 29% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in New Castle County DE
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 19720 | Historic New Castle | 61,043 | ▴ 3% |
| 19702 | Bear | 55,653 | ▴ 7.2% |
| 19709 | Middletown | 49,599 | ▴ 41.3% |
| 19711 | Newark | 48,477 | ▾ -5.5% |
| 19701 | Bear | 42,717 | ▴ 9% |
| Download all zip code data | |||
New Castle County Zip Code populations and trends per most recent census data.
New Castle County Demographics
New Castle County has a median age of 39.2, which makes the county a little younger than Delaware overall. About 21.4% of residents are under 18, while 16.6% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 32.9% of the population, which points to a solid working-age base. About 39.2% of adults have a bachelor's degree or higher, above the statewide figure of 35.3%. The county has a more diverse population mix, with no single race or ethnicity accounting for all of the local story.
Key Demographics for New Castle County DE
Median Age
39.2
Under 18
21.4%
Age 65+
16.6%
Bachelor's+
39.2%
New Castle County School Districts
New Castle County is served by 6 public school districts with 65,106 students enrolled in 2024. The largest districts on the county map are Red Clay Consolidated, Christina and Appoquinimink. Those three districts account for about 62% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, based on district totals from 2017 to 2024.
Largest School Districts by Enrollment in New Castle County DE
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Red Clay Consolidated School District | 14,444 | 22.2% | ▾ -0.7% |
| Christina School District | 12,954 | 19.9% | ▾ -0.9% |
| Appoquinimink School District | 12,897 | 19.8% | ▾ -0.4% |
| Brandywine School District | 10,349 | 15.9% | ▾ 0% |
| Colonial School District | 8,575 | 13.2% | ▾ -2.3% |
| Download all school district data | |||
New Castle County school district enrollment and trends per most recent NCES reporting data.
New Castle County Housing & Real Estate
New Castle County has a median home value of $329,800 and a median gross rent of $1,379. About 69% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Delaware median, while rents come in above the state average. In March 2026, the median listing price was $421,502 and homes spent about 38 days on the market.
New Castle County Housing Mix
New Castle County housing mix: owner, renter and vacant units.
New Castle County Housing Trends
New Castle County median home value and rent trend (last 5 years).
Businesses in New Castle County, DE
New Castle County has 22,785 business listings across 1,080 categories. The largest categories in New Castle County business listings are Churches & Religious Organizations (504, 2.2%), Real Estate Agents (391, 1.7%), and Landmark And Historical Building (382, 1.7%). The full New Castle County business listings dataset includes names, categories, addresses and contact details where available. New Castle County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in New Castle County, DE
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 504 | 2.2% |
| Real Estate Agents | 391 | 1.7% |
| Landmark And Historical Building | 382 | 1.7% |
| ATMs | 379 | 1.7% |
| Medical Offices | 350 | 1.5% |
| Contractors | 332 | 1.5% |
| Professional Services | 305 | 1.3% |
| Auto Repair | 291 | 1.3% |
| Community & Nonprofits | 275 | 1.2% |
| Software Development | 260 | 1.1% |
New Castle County Business Listings
| Business | Category | City |
|---|---|---|
| Eclipse Wellness | Abuse And Addiction Treatment | Wilmington |
| Wilmington University Campus Store | Academic Bookstore | New Castle |
| Playa Bowls | Acai Bowls | Middletown |
| Village at Fox Point Apartments | Accommodation | Wilmington |
| Belfint Lyons & Shuman | Accountant | Wilmington |
| Hamboards | Active Life | Newport |
| Gong Acupuncture & Chinese Herbs | Acupuncture | New Castle |
| Addiction Rehab Wilmington | Addiction Rehabilitation Center | Wilmington |
| A Better Chance For Our Children | Adoption Services | Wilmington |
| Project New Start, Inc. | Adult Education | Claymont |
| Download New Castle County business listings | ||
New Castle County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
New Castle County Basemaps
New Castle County map and data packages include a set of useful basemaps to help you get started quickly. These include a custom light grey canvas, USGS topo, imagery and other reference layers that make it easier to build clear, meaningful county maps using the included GIS layers, your own data or both. Pre-rendered map tiles for the light grey basemap are included so you can use them offline or host them on your own CDN.
Get the Full New Castle County Data Package
This page shows a preview of what's included in the New Castle County data package. The full package gives you a ready-to-use county data system with GIS layers, historical data, maps, database files and planning tools that save hours of manual data gathering, cleanup and joins. Everything is organized to help you skip data wrangling and start analysis faster.
- 20+ GIS layers for zip codes, school districts, roads, water, boundaries and more
- Historical county demographics, housing, income and trend data
- ZIP code population files and school district enrollment history
- Database files, markdowns, AI-ready prompts and documentation
- Map exports in PNG, JPEG, PDF, SVG and GeoTIFF formats
- Offline-ready data explorer, map and analytics tools
Paid packages support commercial use, client work, and derived outputs. Some package contents may include source-specific attribution or provider notices. See Licensing & Data Source Notices.
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Nearby Counties
Browse county data pages for the counties that border New Castle County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.