Delaware County Map
All 3 counties with county seats and major cities
Delaware has the fewest counties of any state: New Castle, Kent and Sussex. This map shows all 3 counties and their county seats. Tap a county for details, or download the free printable map below.
Updated October 4, 2026 · Boundaries: U.S. Census Bureau 2025 · Population: Census estimates for July 1, 2025
Delaware county facts
- Number of counties
- 3
- Largest by land area
- Sussex County 936 sq mi
- Smallest by land area
- New Castle County 426.3 sq mi
- Most people
- New Castle County 588,026
- Fewest people
- Kent County 194,786
- Fastest growing since 2020
- Sussex County +16.8%
- Highest median household income
- New Castle County $91,166
- Oldest county
- New Castle County est. 1673
- Newest county
- Kent County est. 1683
- State capital
- Dover Kent County
Delaware's counties are divided into hundreds, a term William Penn brought in 1682 for tax districts. Delaware is the only one of the original colonies still using it for county subdivisions.
Maryland also claimed the area. In 1669 it created Durham County north of the Hoarkill (Lewes), but that county never operated.
List of 3 Delaware counties
Sorted A–Z. Click a column to sort, or a name to show it on the map. Download as CSV
| County | County seat | Population 2025 | Change since 2020 | Land area (sq mi) | Median income | Established | FIPS |
|---|---|---|---|---|---|---|---|
| Kent County | Dover | 194,786 | +7.1% | 586 | $74,477 | 1683 | 10001 |
| New Castle County | Wilmington | 588,026 | +3% | 426 | $91,166 | 1673 | 10003 |
| Sussex County | Georgetown | 277,140 | +16.8% | 936 | $81,497 | 1683 | 10005 |
Delaware county map with cities
The largest cities in Delaware and the counties they are in. Cities that cross a county line list every county, the main one first. To find any smaller town, use the search box above.
| City | County | Population 2025 |
|---|---|---|
| Wilmington | New Castle County | 73,512 |
| Dover | Kent County | 40,592 |
| Newark | New Castle County | 30,359 |
| Middletown | New Castle County | 25,798 |
| Milford | Sussex and Kent counties | 14,723 |
| Smyrna | Kent and New Castle counties | 13,340 |
| Seaford | Sussex County | 9,165 |
| Georgetown | Sussex County | 8,291 |
| Millsboro | Sussex County | 7,890 |
| Elsmere | New Castle County | 6,196 |
| New Castle | New Castle County | 5,726 |
| Laurel | Sussex County | 4,557 |
| Clayton | Kent and New Castle counties | 4,527 |
| Camden | Kent County | 4,176 |
| Harrington | Kent County | 3,974 |
| Milton | Sussex County | 3,860 |
| Lewes | Sussex County | 3,826 |
| Selbyville | Sussex County | 3,381 |
| Ocean View | Sussex County | 3,107 |
| Bridgeville | Sussex County | 2,997 |
| Townsend | New Castle County | 2,985 |
| Cheswold | Kent County | 2,653 |
| Delmar | Sussex County | 2,366 |
| Millville | Sussex County | 2,145 |
| Delaware City | New Castle County | 1,939 |
| Wyoming | Kent County | 1,865 |
| Felton | Kent County | 1,386 |
| Blades | Sussex County | 1,372 |
| Bellefonte | New Castle County | 1,313 |
| Rehoboth Beach | Sussex County | 1,309 |
Printable Delaware county maps (free PDF, PNG, SVG)
Every map is free to print and share. The PDFs are vector files with real text, so they stay sharp at any size and you can search them for a county name. Use 11×17 (tabloid) for the most readable labels.
Color map with names
All 3 counties labeled, county seats marked. Letter and 11×17 PDF, high-resolution PNG, editable SVG.
Map with cities
Counties with their county seat towns and major cities.
Blank outline map
County lines only, no names. For quizzes, coloring and your own notes.
Numbered map with key
A number in every county with an alphabetical key.
Black and white
Labeled map that prints well on any printer.
Population map
Counties shaded by population density (2025 estimates).
Data and GIS files
The county table as CSV, and the boundaries as GeoJSON and KML (Google Earth, Google My Maps).
Where Delaware's three counties came from
Delaware's counties began as courts on the west side of the Delaware River and Bay. After retaking New York in 1673, the Dutch set up courts at New Amstel, now New Castle, and at the Hoarkill, later Deale and now Sussex. In 1680 a third court district, St. Jones, was carved out between them under the authority of the Duke of York. The Duke transferred the area to William Penn in 1682. On December 23 of that year Penn renamed Deale County Sussex and St. Jones County Kent, and kept the name New Castle. Together they became known as the Three Lower Counties of Pennsylvania. They met in assembly with Pennsylvania's counties until 1704, when they set up their own legislature, and Delaware cut its ties with Pennsylvania in 1776.
County maps of neighboring states
Maryland county map
New Jersey county map
Pennsylvania county map
Delaware counties: questions and answers
- How many counties are in Delaware?
- Delaware has 3 counties.
- What is the largest county in Delaware?
- By land area, Sussex County is the largest (936 sq mi). By population, New Castle County is the largest, with 588,026 people (2025 estimate).
- What is the smallest county in Delaware?
- New Castle County is the smallest by land area (426.3 sq mi). Kent County has the fewest people: 194,786 (2025 estimate).
- What is the wealthiest county in Delaware?
- By median household income, New Castle County ranks first with $91,166 (American Community Survey 2020–2024). The lowest is Kent County at $74,477.
- What county is Wilmington in?
- Wilmington is in New Castle County.
- What county is Dover in?
- Dover is in Kent County.
- What county is Newark in?
- Newark is in New Castle County.
- How can I see county lines on Google Maps?
- Google Maps does not draw county lines. Download the KML file from the printable maps section above and import it into Google My Maps (Create a new map › Import) or open it in Google Earth to see every Delaware county boundary on top of Google's map.
- Can I use this map for free?
- Yes. The maps and files on this page are free to print, share and use in your own work, including commercial projects, under the CC BY 4.0 licence. Please credit “WhichCounty (whichcounty.com)”.
Use this map on your site
You may copy, print and publish these maps, also commercially, as long as you credit WhichCounty with a link (licence details). Paste this code to embed the map:
Sources and methodology
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000), simplified for display. Projection: Lambert conformal conic fitted to Delaware.
- Population: Census Bureau county estimates, Vintage 2025 (July 1, 2025), compared with the April 1, 2020 estimates base.
- Land area: Census Bureau 2026 Gazetteer files. Median household income: American Community Survey 2020–2024 5-year estimates.
- County seats and founding years: Wikidata (CC0), checked against state lists by WhichCounty. Cities: Census Bureau city and town estimates, Vintage 2025.
- Delaware's Destiny Determined by Lewes (Delaware Public Archives e-book)
- Colonial/Pre-Statehood Records, agency history (Delaware Public Archives)
- How to search a chain of title: hundreds (Delaware Public Archives)
- Historical marker: Kent County Courthouses 1680-1983 (Delaware Public Archives)
- Atlas of Historical County Boundaries: Delaware (Newberry Library)
Found an error? Tell us. Last data update: October 4, 2026.