• county
  • FIPS 42045
  • Largest town: Chester

Delaware County, Pennsylvania

Delaware County had 584,882 residents in the Census Vintage 2024 estimate, on 183.8 square miles of land. It ranks 5th of 67 in Pennsylvania by population and 65th by land area.

Population
584,882
#5 of 67 in Pennsylvania · #122 in US
Area
183.8 sq mi
#65 of 67 in Pennsylvania · #3,023 in US
Density
3,182 / sq mi
#2 of 67 in Pennsylvania · #32 in US
Median household income
$84,180
#4 of 67 in Pennsylvania · #347 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Delaware County within Pennsylvania. Pin: Harrisburg.

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Tools and pages that start from Delaware County

Delaware County population, land area and income

Delaware County had 584,882 residents in the Census Vintage 2024 estimate, on 183.8 square miles of land. It ranks 5th of 67 in Pennsylvania by population and 65th by land area. That works out to 3,182.0 people per square mile, 33.1 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Pennsylvania has 82,953 residents, so Delaware County is 7.1 times that size.

Its SAIPE 2023 median household income of $84,180 is in the top quarter among 3,143 counties with an estimate.

National rank among 3,144

Population

584,882

3144th1st

122nd of 3,144 (US)

Land area

184 sq mi

3144th1st

3023rd of 3,144 (US)

Density

3,182.0 / sq mi

3144th1st

32nd of 3,144 (US)

Median household income

$84,180

3143rd1st

347th of 3,143 (US)

Rank within Pennsylvania (67)

Population

584,882

67th1st

5th of 67 (PA)

Land area

184 sq mi

67th1st

65th of 67 (PA)

Density

3,182.0 / sq mi

67th1st

2nd of 67 (PA)

Median household income

$84,180

67th1st

4th of 67 (PA)

How Delaware County's population changed since 2020

Delaware County gained 8,359 residents between the July 2020 and July 2024 estimates, a rise of 1.4%. That ranks 19th of 67 in Pennsylvania for growth. The median Pennsylvania county changed by -0.5%, and the state as a whole by +0.6%.

Since the April 2020 estimates base, Delaware County recorded 27,190 births and 24,649 deaths, a natural change of +2,541. Net international migration added +12,738 and net domestic migration, people moving to or from other US counties, came to -7,831. The largest single component was international migration, which added 12,738 people.

576.5k2020577.1k2021577.0k2022580.5k2023584.9k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
27,190
Deaths
24,649
Net international migration
+12,738
Net domestic migration
-7,831
Change, July 2023 to July 2024
+4,344

Where Delaware County is

The Census internal point of Delaware County is at 39.916700, -75.398800. It sits in UTM zone 18N. The map shades Pennsylvania's 67 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Delaware County outlined. Dots are towns of 1,000+ people with residents in it.

Adams County: +4.0%Potter County: -2.4%Sullivan County: +1.6%Bucks County: +0.6%Carbon County: +1.5%McKean County: -2.3%Montour County: -0.1%Fulton County: -0.9%Columbia County: +2.0%Cameron County: -4.1%Elk County: -2.6%Bradford County: -0.4%Bedford County: +0.1%York County: +3.2%Monroe County: -1.1%Forest County: -5.2%Berks County: +2.4%Cambria County: -2.3%Franklin County: +2.1%Snyder County: -0.3%Somerset County: -2.5%Clarion County: -0.9%Indiana County: -0.2%Lackawanna County: +0.6%Wyoming County: -1.0%Lawrence County: -2.0%Mercer County: -2.2%Lehigh County: +3.0%Northampton County: +3.3%Cumberland County: +5.9%Fayette County: -3.6%Jefferson County: -2.5%Centre County: +1.2%Lebanon County: +1.4%Union County: -1.2%Clinton County: +1.3%Chester County: +4.8%Montgomery County: +2.6%Wayne County: +0.5%Pike County: +6.5%Susquehanna County: -0.6%Allegheny County: -1.4%Clearfield County: -2.9%Butler County: +2.7%Beaver County: -1.4%Crawford County: -2.1%Washington County: +0.5%Venango County: -1.7%Warren County: -3.0%Blair County: -2.0%Huntingdon County: -1.6%Lancaster County: +1.9%Luzerne County: +1.9%Westmoreland County: -1.0%Juniata County: -0.4%Armstrong County: -2.7%Tioga County: -0.8%Delaware County: +1.4%Northumberland County: -1.7%Mifflin County: -0.5%Lycoming County: -0.8%Perry County: +2.1%Philadelphia County: -1.7%Schuylkill County: +1.1%Dauphin County: +2.2%Greene County: -5.3%Erie County: -1.1%
Change 2020 to 2024
  1. < -2.2%
  2. < -1.0%
  3. < +0.1%
  4. < +1.9%
  5. ≥ +1.9%
no data

Orange pin: Delaware County internal point. Dark pin: Harrisburg.

Internal point

Decimal
39.916700, -75.398800
DMS
39°55'0.12"N 75°23'55.68"W
UTM
18N 465917.2E 4418587.9N
Geohash
dr47h6878
Plus code
87F6WJ82+MF

Towns in Delaware County

27 incorporated places of 1,000+ people have residents in Delaware County, 174,994 people together, or 30% of the county. Each figure counts only the part of the town inside Delaware County; towns marked "part" extend into another county. The largest is Chester with 34,052.

  1. 01Chester34,052
  2. 02Yeadon12,405
  3. 03Lansdowne11,225
  4. 04Darby10,749
  5. 05Collingdale8,956
  6. 06Brookhaven8,407
  7. 07Ridley Park7,310
  8. 08Glenolden7,266
  9. 09Clifton Heights6,880
  10. 10Folcroft6,827
  11. 11Swarthmore6,596
  12. 12Prospect Park6,452
  13. 13Sharon Hill6,039
  14. 14Norwood5,969
  15. 15Media5,938
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Delaware County

The Census 2024 county adjacency file lists 5 neighbors for Delaware County, including 2 across a state line. The most populous is Philadelphia County, PA, with 1,573,916 residents. Distances run between Census internal points in a straight line.

Distance to Harrisburg and the nearest big city

Harrisburg is 82.1 miles WNW of Delaware County's internal point in a straight line. The nearest place of 100,000 or more is Philadelphia, PA (population 1,573,916), 15.5 miles away. The nearest place of 10,000 or more is Chester, PA (population 34,052), 5.1 miles away.

Delaware County FIPS code

The FIPS code of Delaware County is 42045: state code 42 for Pennsylvania plus county code 045. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $84,180.

Questions people ask

What is the population of Delaware County, Pennsylvania?

The Census Vintage 2024 estimate for July 1, 2024 is 584,882. That is up 8,359 people (1.4%) from the July 2020 estimate of 576,523.

What is the FIPS code of Delaware County?

42045. The first two digits (42) are Pennsylvania; the last three (045) identify the county.

What is the largest town in Delaware County?

Chester, with 34,052 residents inside Delaware County in 2024.

Which counties border Delaware County?

5 county-equivalents border it in the Census 2024 adjacency file: Philadelphia County, PA; Montgomery County, PA; New Castle County, DE; Chester County, PA; Gloucester County, NJ.

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 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

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