CountyAtlas Delaware
Delaware County Map with Cities — All 3 Counties
All 3 of Delaware's counties, mapped from official U.S. Census boundaries with population, income, and unemployment for every one. Colour the map by any measure, tap a county for its data, or download a print-ready copy.
Tap any county for its population, income, and more.
Delaware at a glance
- Scale. Delaware is divided into 3 counties across 1,949 sq mi of land — an average of 650 sq mi each. Census TIGER
- People. Its counties are home to 1,031,890 residents — an average of 343,963 each, or 530 per square mile statewide. Census PEP 2023
- Water. Another 540 sq mi is water — 21.7% of the state’s area, led by Sussex County. Census TIGER
Delaware’s 3 counties, by the numbers
Every county’s population, median household income, unemployment, density, and land area — sortable by any column, so you can find yours or rank by what matters to you. A few patterns run through the data:
- Concentrated. Half of Delaware’s 1,031,890 residents live in just 1 of 3 counties. Census PEP 2023
- Mostly small. Half of Delaware’s counties have fewer than 263,509 residents, and half report a median household income below $78,092. Census PEP 2023 · SAIPE 2023
- Lopsided density. Only 1 of 3 counties is denser than Delaware’s statewide average of 530 people per square mile — the rest are more rural. Census PEP 2023 · TIGER
| Kent County | 189,789 | $72,498 | 4.6% | 324/sq mi | 586 sq mi | Dover |
| New Castle County | 578,592 | $86,798 | 4.1% | 1,357/sq mi | 426 sq mi | Wilmington |
| Sussex County | 263,509 | $78,092 | 4.2% | 281/sq mi | 936 sq mi | Georgetown |
All 3 counties, sortable by any column — click a heading. A suppressed estimate (coefficient of variation ≥ 0.30) shows a marker, never a guess. County seats are from Wikidata (CC0), each validated to a Census place inside its county; a county with no validated seat is left blank. See the methodology.
Download & print this Delaware map
Delaware maps, coloured by the data
Cities in Delaware
Delaware has 57 incorporated cities, towns, and villages. The largest is Wilmington in New Castle County with 71,124 residents. Use the search on the map above to find any city and highlight the county it sits in.
| Wilmington | New Castle County | 71,124 |
| Dover | Kent County | 39,491 |
| Newark | New Castle County | 30,309 |
| Middletown (town) | New Castle County | 24,071 |
| Smyrna (town) | Kent County | 13,031 |
| Milford | Sussex County | 12,193 |
| Seaford | Sussex County | 8,255 |
| Georgetown (town) | Sussex County | 7,456 |
| Millsboro (town) | Sussex County | 7,152 |
| Elsmere (town) | New Castle County | 6,189 |
| New Castle | New Castle County | 5,519 |
| Clayton (town) | Kent County | 4,086 |
| Laurel (town) | Sussex County | 4,043 |
| Camden (town) | Kent County | 4,011 |
| Harrington | Kent County | 3,805 |
| Milton (town) | Sussex County | 3,469 |
| Lewes | Sussex County | 3,415 |
| Selbyville (town) | Sussex County | 3,005 |
| Townsend (town) | New Castle County | 2,792 |
| Ocean View (town) | Sussex County | 2,760 |
| Bridgeville (town) | Sussex County | 2,661 |
| Delmar (town) | Sussex County | 2,386 |
| Millville (town) | Sussex County | 2,059 |
| Delaware City | New Castle County | 1,976 |
| Cheswold (town) | Kent County | 1,833 |
| Greenwood (town) | Sussex County | 1,800 |
| Wyoming (town) | Kent County | 1,789 |
| Bellefonte (town) | New Castle County | 1,507 |
| Rehoboth Beach | Sussex County | 1,388 |
| Dagsboro (town) | Sussex County | 1,350 |
| Newport (town) | New Castle County | 1,209 |
| Felton (town) | Kent County | 1,129 |
| Blades (town) | Sussex County | 1,055 |
| Frederica (town) | Kent County | 972 |
| Bethany Beach (town) | Sussex County | 923 |
| Frankford (town) | Sussex County | 883 |
| Ellendale (town) | Sussex County | 675 |
| Arden (village) | New Castle County | 600 |
| South Bethany (town) | Sussex County | 503 |
| Houston (town) | Kent County | 456 |
| Bethel (town) | Sussex County | 431 |
| Slaughter Beach (town) | Sussex County | 431 |
| Odessa (town) | New Castle County | 392 |
| Fenwick Island (town) | Sussex County | 383 |
| Kenton (town) | Kent County | 362 |
| Dewey Beach (town) | Sussex County | 328 |
| Woodside (town) | Kent County | 309 |
| Bowers (town) | Kent County | 273 |
| Ardentown (village) | New Castle County | 269 |
| Magnolia (town) | Kent County | 237 |
Showing the 50 most populous — and 7 more. Search the map above for any Delaware city or village.
A city can span more than one county; each is listed in its primary county — the one its center falls in.
Which Delaware county is the richest, largest, most crowded? The answers
- Delaware’s highest median household income is in New Castle County ($86,798); the lowest is in Kent County ($72,498). Census SAIPE 2023
- Delaware’s most populous county is New Castle County (578,592); the least populous is Kent County (189,789) — a 3× spread. Census PEP 2023
- Delaware’s largest county by land area is Sussex County (936 sq mi); the smallest is New Castle County (426 sq mi). Census TIGER
- Delaware’s highest population density is in New Castle County (1,357/sq mi); the lowest is in Sussex County (281/sq mi). Census PEP 2023 · TIGER
- Delaware’s highest poverty rate is in Kent County (11.7%); the lowest is in Sussex County (10.1%). Census SAIPE 2023
- In Delaware, unemployment is highest in Kent County (4.6%) and lowest in New Castle County (4.1%), for May 2026. BLS LAUS
- Delaware’s highest median age is in Sussex County (51.4); the lowest is in Kent County (38.5). Census ACS 2019–2023
- Delaware’s highest share of bachelor’s degrees is in New Castle County (39.2% of adults); the lowest is in Kent County (26.7%). Census ACS 2019–2023
Every figure is a current official estimate from the source named — not a crowd-sourced or copied value. Suppressed estimates (coefficient of variation ≥ 0.30) are omitted, never guessed. See the full methodology.
Delaware counties: common questions
How many counties are in Delaware?
Delaware has 3 counties covering 1,949 sq mi and about 1.0M residents. Every one is on the map above and in the table below.
What is the largest county in Delaware?
It depends on the measure. By land area it’s Sussex County (936 sq mi); by population it’s New Castle County (578,592 residents).
What county is Wilmington in?
Wilmington (population 71,124) is in New Castle County. Use the search on the map to find any Delaware city’s county.
What is the richest county in Delaware?
By median household income, New Castle County is the richest at $86,798; the poorest is Kent County at $72,498 (Census SAIPE 2023).
What is the most populous county in Delaware?
New Castle County, with 578,592 residents — about 56.1% of Delaware’s people, and 3× the least populous, Kent County (189,789).
Sources & vintages
- Population — PEP Vintage 2023 (July 1, 2023) — pep/charv
- Median household income & poverty — SAIPE 2023
- Unemployment — BLS LAUS May 2026 (preliminary)
- Geometry & boundaries — Census TIGERweb
- Cities & city population — Census TIGERweb Incorporated Places + ACS 5-year 2019–2023
Data current through .