Demographics of Delaware County, Pennsylvania

Delaware County, Pennsylvania had 580,937 people on July 1, 2025, by the Census Bureau’s estimate: +4,432 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Delaware County, in four figures

580,937
Population: July 1, 2025, Vintage 2025 estimate.; +0.8%
Change since July 2020: +4,432 people.; 39.1 ±0.2
Median age: ACS 2020–⁠2024.; $89,546 ±$1,375
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Delaware County, Pennsylvania's population grew 0.8% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Delaware County, Pennsylvania's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Delaware County, Pennsylvania's population grew 0.8% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Delaware County, Pennsylvania's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	576,505	100.0	100.0
2021	577,178	100.1	100.2
2022	576,666	100.0	100.7
2023	579,086	100.4	101.6
2024	581,416	100.9	102.5
2025	580,937	100.8	103.1

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Population of Delaware County, Pennsylvania on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	576,505	−457	−461	+31	−175
2021	577,178	+673	+141	+646	−672
2022	576,666	−512	+762	+1,969	−3,057
2023	579,086	+2,420	+705	+3,627	−1,849
2024	581,416	+2,330	+639	+3,972	−2,257
2025	580,937	−479	+618	+1,622	−2,741

Age, 2020–2024

The median age is 39.1 ±0.2: for men 37.9 ±0.2 and for women 40.2 ±0.3. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Delaware County by age, ACS 2020–2024
Age	People	Share	Pennsylvania	United States
Under 5	32,930 ±25	5.7% ±<0.1	5.2% ±<0.1	5.6% ±<0.1
5 to 17	94,653 ±1,540	16.3% ±0.3	15.2% ±0.1	16.3% ±<0.1
18 to 24	56,493 ±1,354	9.8% ±0.2	9.0% ±<0.1	9.1% ±<0.1
25 to 44	149,457 ±1,710	25.8% ±0.3	25.5% ±0.1	26.9% ±<0.1
45 to 64	144,723 ±1,839	25.0% ±0.3	25.6% ±0.1	24.8% ±<0.1
65 and over	100,966 ±1,976	17.4% ±0.3	19.5% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $89,546 ±$1,375, and income per person $49,673 ±$799, in 2024 dollars. The median is $77,971 ±$342 in Pennsylvania and $80,734 ±$166 in the United States.

Households by income

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Households in Delaware County by income, ACS 2020–2024
Household income	Households	Share	Pennsylvania	United States
Under $25,000	28,181 ±1,604	13.0% ±0.7	15.1% ±0.1	14.6% ±<0.1
$25,000 to $49,999	33,527 ±1,595	15.5% ±0.7	17.4% ±0.1	16.7% ±<0.1
$50,000 to $74,999	30,792 ±1,475	14.2% ±0.7	15.9% ±0.1	15.5% ±<0.1
$75,000 to $99,999	26,314 ±1,180	12.1% ±0.5	12.8% ±0.1	12.6% ±<0.1
$100,000 to $149,999	37,591 ±1,488	17.3% ±0.7	17.7% ±0.1	17.5% ±<0.1
$150,000 to $199,999	21,921 ±1,169	10.1% ±0.5	9.3% ±0.1	9.6% ±<0.1
$200,000 or more	38,620 ±1,351	17.8% ±0.6	11.8% ±0.1	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Delaware County by age, ACS 2020–2024
Age	Below poverty	Rate	Pennsylvania	United States
All ages	56,672 ±3,206	10.2% ±0.6	11.7% ±0.1	12.5% ±0.1
Under 18	16,576 ±1,388	13.2% ±1.1	15.6% ±0.2	16.1% ±0.1
18 to 59	27,080 ±1,834	9.1% ±0.6	11.0% ±0.2	11.6% ±0.1
60 and over	13,016 ±973	9.7% ±0.7	10.1% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Delaware County, ACS 2020–2024
Measure	Delaware County	Pennsylvania	United States
Housing units	229,715 ±174	5,806,452 ±672	143,775,355 ±10,234
Occupied	94.4% ±0.4	90.8% ±0.2	89.9% ±0.1
Vacant	5.6% ±0.4	9.2% ±0.2	10.1% ±0.1
Owner occupied	69.6% ±0.8	69.3% ±0.3	65.2% ±0.3
Renter occupied	30.4% ±0.9	30.7% ±0.2	34.8% ±0.1
Median home value	$332,200 ±$4,050	$254,500 ±$767	$332,700 ±$236
Median gross rent	$1,372 ±$22	$1,209 ±$5	$1,413 ±$2
Median year built	1957 ±1	1965 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Delaware County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Pennsylvania	United States
Hispanic or Latino	29,222 ±0	5.0% ±<0.1	8.7% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	361,386 ±945	62.4% ±0.2	73.0% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	126,799 ±1,514	21.9% ±0.3	10.3% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	36,677 ±615	6.3% ±0.1	3.8% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	202 ±71	< 0.1% ±<0.1	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 327	0% to 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	3,036 ±949	0.5% ±0.2	0.5% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	21,762 ±1,793	3.8% ±0.3	3.6% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Delaware County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Pennsylvania	United States
Born in the state	404,310 ±2,870	69.8% ±0.5	70.6% ±0.1	57.3% ±<0.1
Born in another state	102,968 ±2,509	17.8% ±0.4	19.8% ±0.1	26.9% ±<0.1
Born a citizen outside the states	6,920 ±698	1.2% ±0.1	1.9% ±<0.1	1.7% ±<0.1
Born abroad	65,024 ±2,307	11.2% ±0.4	7.7% ±0.1	14.1% ±<0.1
Naturalized citizens	40,903 ±1,577	7.1% ±0.3	4.3% ±0.1	7.4% ±<0.1
Not citizens	24,121 ±1,721	4.2% ±0.3	3.4% ±0.1	6.8% ±<0.1

Delaware County among the counties of Pennsylvania

5th of 67 by population, July 2025. Every one is listed on the Pennsylvania page.

Counties of Pennsylvania near Delaware County in population, July 2025
County	July 2025	Change since 2020
Philadelphia County	1,574,281	−1.7%
Allegheny County	1,225,035	−2.0%
Montgomery County	877,643	+2.4%
Bucks County	647,828	+0.3%
Delaware County	580,937	+0.8%
Lancaster County	563,159	+1.9%
Chester County	557,116	+4.2%
York County	473,197	+3.6%
Berks County	440,072	+2.7%
Lehigh County	384,383	+2.7%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026