State 10 · DE

Delaware county map

Delaware has 3 counties. Sussex County is the largest by land at 936 square miles, and New Castle County is the most populous with 588,093 residents.

Population 2024
1,051,917
#45 of 51
Land area
1,949 sq mi
#49 of 51
Density
539.8 / sq mi
#7 of 51
Counties
3
Capital: Dover
N
Dover 39.16° N, 75.52° W

Map of all 3 counties in Delaware

Every county is labeled on Census 2024 boundaries. Download it as a PDF to print, a PNG, or an editable SVG. For blank, colored or city versions, see the printable Delaware map sheets.

KentNew CastleSussexDelaware county map. Online Map Tools (onlinemaptools.com), Census 2024 boundaries, free to reuse with credit.
3 units labeled. The orange dot marks the capital.

Delaware population and land area

Delaware had 1,051,917 residents in the Census Vintage 2024 estimates, the sum of its counties. That ranks 45th of the 50 states and DC. Its 1,949 square miles of land rank 49th. Delaware averages 539.8 people per square mile of land, 5.6 times the national figure of 96.3. By density it ranks 7th.

Population, 2024
1,051,91745th of 51
Land area
1,949 sq mi49th of 51
Density
539.8 per sq mi7th of 51
Number of counties
3
Capital
Dover39.157° N, 75.519° W
State FIPS code
10

Delaware counties by population, density and income

Each shape is shaded by quintile, darker for higher values. Switch the measure above the map. Select a shape to open that county's page. The pin marks the capital, Dover.

New Castle County: 1,379Kent County: 329Sussex County: 290
Density
  1. < 290
  2. 290+
  3. 290+
  4. 329+
  5. 329+
no data

Largest county in Delaware by land area

Sussex County ranks first at 936 square miles and New Castle County last at 426 square miles. The top value is 2.2 times the bottom one.

  1. 01Sussex County936
  2. 02Kent County586
  3. 03New Castle County426

Most populous county in Delaware

New Castle County ranks first at 588,093 residents and Kent County last at 192,690 residents. The top value is 3.1 times the bottom one.

  1. 01New Castle County588,093
  2. 02Sussex County271,134
  3. 03Kent County192,690

Least populous county in Delaware

The smallest populations, fewest first. Estimates for small counties carry more uncertainty than those for large ones.

  1. 01Kent County192,690
  2. 02Sussex County271,134
  3. 03New Castle County588,093
Log scale, so small counties stay visible next to the largest.

Most densely populated county in Delaware

New Castle County ranks first at 1,379.4 people per square mile and Sussex County last at 289.6 people per square mile. The top value is 4.8 times the bottom one.

  1. 01New Castle County1,379.4
  2. 02Kent County328.8
  3. 03Sussex County289.6
People per square mile of land, log scale.

Highest median household income in Delaware

New Castle County ranks first at $86,798 and Kent County last at $72,498. The two are within a factor of 1.20.

  1. 01New Castle County$86,798
  2. 02Sussex County$78,092
  3. 03Kent County$72,498

Towns and cities in Delaware

The Census Vintage 2024 subcounty estimates list 33 incorporated places in Delaware with 1,000 or more residents, holding 289,766 people together, or 28% of the state total. 11 of them have 5,000 or more. The northernmost is Bellefonte at 39.767° N and the southernmost is Selbyville at 38.461° N. Among places of 5,000+, Milford grew fastest from July 2020 to July 2024, by 24.5%.

  1. 01Wilmington73,176
  2. 02Dover40,191
  3. 03Newark30,506
  4. 04Middletown25,686
  5. 05Milford14,079
  6. 06Smyrna13,326
  7. 07Seaford8,952
  8. 08Georgetown8,098
  9. 09Millsboro7,864
  10. 10Elsmere6,234
  11. 11New Castle5,715
  12. 12Clayton4,511
Largest incorporated places, Vintage 2024 estimates.

Dover, the capital

100.0% of Delaware's place population, 289,766 of 289,766 people, lives in places within 100 miles of Dover. That ranks 3rd of 51 for how central the capital is.

See all states in the capital radius ranking and the most remote towns ranking. Sunrise and sunset times for Dover, month by month, are on the Dover daylight page.

States bordering Delaware

Delaware borders 3 states or districts. The nearest neighboring capital is Annapolis, 54 miles WSW of Dover in a straight line.

UTM zones in Delaware

The internal points of Delaware's counties fall in UTM zone 18. Zones are 6 degrees of longitude wide, numbered from 180° W: zone = floor((longitude + 180) / 6) + 1.

All 3 counties in Delaware

Sort by any column. The small orange number marks the top 3 in the state by population.

FIPS
10003New Castle County588,093#14261,379.4$86,798
10005Sussex County271,134#2936289.6$78,092
10001Kent County192,690#3586328.8$72,498

Download all 3 counties as CSV

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 Gazetteer, places
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.