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. Color 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. calculated from Census TIGER 2026
- People. Its counties are home to 1,059,952 residents. That averages 353,317 each, or 544 per square mile statewide. calculated from Census PEP V2025 · Census TIGER 2026
- Water. Another 540 sq mi is water, or 21.7% of the state’s area. Sussex County has the most. calculated from Census TIGER 2026
Delaware’s 3 counties, by the numbers
The table lists every county’s population, median household income, unemployment, density, and land area. Sort it by any column to find yours or rank them. A few patterns stand out:
- Concentrated. Half of Delaware’s 1,059,952 residents live in just 1 of 3 counties. calculated from Census PEP V2025
- The median county. Half of Delaware’s counties have fewer than 277,140 residents, and half report a median household income below $84,917. calculated from Census PEP V2025 · Census SAIPE 2024
- Lopsided density. Only 1 of 3 counties is denser than Delaware’s statewide average of 544 people per square mile. calculated from Census PEP V2025 · Census TIGER 2026
| Kent County | 194,786 | $78,240 | 5.0% | 332/sq mi | 586 sq mi | Dover |
| New Castle County | 588,026 | $89,750 | 4.6% | 1,379/sq mi | 426 sq mi | Wilmington |
| Sussex County | 277,140 | $84,917 | 4.2% | 296/sq mi | 936 sq mi | Georgetown |
Click a column heading to sort all 3 counties. 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. Where Wikidata has none, the seat comes from the page cited for that county in the seat file, and where the table names no seat, it says why. See the methodology.
Download & print this Delaware map
Delaware maps, colored by the data
Cities in Delaware
Delaware has 57 incorporated cities, towns, and villages. The largest is Wilmington in New Castle County with 71,727 residents. Use the search on the map above to find any city and highlight the county it sits in.
| Wilmington | New Castle County | 71,727 |
| Dover | Kent County | 39,837 |
| Newark | New Castle County | 30,330 |
| Middletown (town) | New Castle County | 24,661 |
| Smyrna (town) | Kent County +1 more (also New Castle County) | 13,165 |
| Milford | Sussex County +1 more (also Kent County) | 12,803 |
| Seaford | Sussex County | 8,485 |
| Georgetown (town) | Sussex County | 7,660 |
| Millsboro (town) | Sussex County | 7,424 |
| Elsmere (town) | New Castle County | 6,203 |
| New Castle | New Castle County | 5,579 |
| Clayton (town) | Kent County +1 more (also New Castle County) | 4,222 |
| Laurel (town) | Sussex County | 4,152 |
| Camden (town) | Kent County | 4,106 |
| Harrington | Kent County | 3,838 |
| Milton (town) | Sussex County | 3,567 |
| Lewes | Sussex County | 3,505 |
| Selbyville (town) | Sussex County | 3,097 |
| Ocean View (town) | Sussex County | 2,851 |
| Townsend (town) | New Castle County | 2,832 |
| Bridgeville (town) | Sussex County | 2,745 |
| Millville (town) | Sussex County | 2,430 |
| Delmar (town) | Sussex County | 2,412 |
| Cheswold (town) | Kent County | 2,143 |
| Wyoming (town) | Kent County | 2,000 |
| Delaware City | New Castle County | 1,950 |
| Greenwood (town) | Sussex County | 1,564 |
| Bellefonte (town) | New Castle County | 1,388 |
| Dagsboro (town) | Sussex County | 1,376 |
| Rehoboth Beach | Sussex County | 1,370 |
| Felton (town) | Kent County | 1,294 |
| Frankford (town) | Sussex County | 1,215 |
| Blades (town) | Sussex County | 1,071 |
| Frederica (town) | Kent County | 1,062 |
| Bethany Beach (town) | Sussex County | 905 |
| Newport (town) | New Castle County | 900 |
| Ellendale (town) | Sussex County | 760 |
| Arden (village) | New Castle County | 627 |
| South Bethany (town) | Sussex County | 545 |
| Woodside (town) | Kent County | 475 |
| Houston (town) | Kent County | 456 |
| Odessa (town) | New Castle County | 409 |
| Slaughter Beach (town) | Sussex County | 408 |
| Fenwick Island (town) | Sussex County | 401 |
| Bethel (town) | Sussex County | 375 |
| Kenton (town) | Kent County | 355 |
| Dewey Beach (town) | Sussex County | 351 |
| Magnolia (town) | Kent County | 274 |
| Bowers (town) | Kent County | 270 |
| Ardentown (village) | New Castle County | 233 |
The table shows the 50 most populous. Search the map above for the other 7.
A city can reach into more than one county. The table names the one its center falls in; “+N more” counts the others, from the Census Bureau’s count of each city by county part Census ACS 2020–2024 place parts.
Which Delaware county is the richest, largest, most crowded? The answers
- Delaware’s highest median household income is in New Castle County ($89,750); the lowest is in Kent County ($78,240). Census SAIPE 2024
- Delaware’s most populous county is New Castle County (588,026); the least populous is Kent County (194,786), a 3× spread. calculated from Census PEP V2025
- Delaware’s largest county by land area is Sussex County (936 sq mi); the smallest is New Castle County (426 sq mi). Census TIGER 2026
- Delaware’s highest population density is in New Castle County (1,379/sq mi); the lowest is in Sussex County (296/sq mi). calculated from Census PEP V2025 · Census TIGER 2026
- Delaware’s highest poverty rate is in New Castle County (10.3%); the lowest is in Sussex County (9.5%). Census SAIPE 2024
- In Delaware, unemployment is highest in Kent County (5.0%) and lowest in Sussex County (4.2%), for September 2026 (preliminary). BLS LAUS September 2026, preliminary
- Delaware’s highest median age is in Sussex County (51.9); the lowest is in Kent County (38.8). Census ACS 2020–2024
- Delaware’s highest share of adults 25 and over with a bachelor’s degree or higher is in New Castle County (39.7%); the lowest is in Kent County (27.5%). Census ACS 2020–2024
Every figure is a current official estimate from the source named, never 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 1.1M residents. Every one is on the map and in the table above.
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 (588,026 residents).
What county is Wilmington in?
Wilmington, population 71,727, 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 $89,750; the poorest is Kent County at $78,240. Census SAIPE 2024
What is the most populous county in Delaware?
New Castle County, with 588,026 residents, about 55.5% of Delaware’s people. That is 3× the least populous, Kent County (194,786).
Sources & vintages
- Source: U.S. Census Bureau, Population Estimates, Vintage 2025 (July 1, 2025) — retrieved Nov 2026
- Source: U.S. Census Bureau, Small Area Income and Poverty Estimates (SAIPE), 2024 — retrieved Nov 2026
- Source: U.S. Census Bureau, American Community Survey 5-year estimates 2020–2024, B01002 median age — retrieved Nov 2026
- Source: U.S. Census Bureau, American Community Survey 5-year estimates 2020–2024, S1501 educational attainment — retrieved Nov 2026
- Source: U.S. Bureau of Labor Statistics, Local Area Unemployment Statistics (LAUS), September 2026, preliminary — retrieved Nov 2026
- Source: U.S. Census Bureau, TIGERweb county boundaries, January 1, 2026 vintage — retrieved Nov 2026
- Source: U.S. Census Bureau, TIGERweb incorporated places, January 1, 2026 vintage — retrieved Nov 2026
- Source: U.S. Census Bureau, American Community Survey 5-year estimates 2020–2024, B01003 total population by place — retrieved Nov 2026
- Source: Wikidata, county seats (P36), query of 2026-11-11 — retrieved Nov 2026
- Source: County, state and Census sources, seats and no-seat reasons for 92 county-equivalents (3 rows cite the Virginia Association of Counties) — retrieved Nov 2026
- Calculated: population density = population ÷ land area (people per sq mi) (method)
- Calculated: state totals = sum over the state’s counties (population, land area, water area) (method)
- Calculated: averages per county = state total ÷ number of counties (method)
- Calculated: population shares = county (or top-5) population ÷ state total × 100; “half the residents” = fewest largest counties whose populations sum to ≥ 50% of the total (method)
- Calculated: medians across counties = middle value of the county values (mean of the two middle values for an even count) (method)
- Calculated: spreads = highest county value ÷ lowest county value (method)
- Calculated: income tiers vs poverty = mean poverty rate of the N highest- and N lowest-income counties, N = min(10, ⌊counties ÷ 2⌋), only for states with ≥ 6 counties (method)
- Calculated: rankings and superlatives = highest / lowest county value; suppressed values excluded (method)
- Calculated: water share = water area ÷ (land area + water area) × 100 (method)
- Calculated: square miles = TIGER AREALAND or AREAWATER (m²) ÷ 2,589,988.11, rounded to 2 dp (method)
Data current through .