Demographics of Sussex County, Delaware

Sussex County, Delaware had 277,140 people on July 1, 2025, by the Census Bureau’s estimate: +38,513 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.

Sussex County, in four figures

277,140
Population: July 1, 2025, Vintage 2025 estimate.; +16.1%
Change since July 2020: +38,513 people.; 51.9 ±0.2
Median age: ACS 2020–⁠2024.; $81,497 ±$1,512
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.

Sussex County, Delaware's population grew 16.1% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Sussex County, Delaware'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).

Source: The Census Bureau

About this chart

The figures

Sussex County, Delaware's population grew 16.1% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Sussex County, Delaware'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	238,627	100.0	100.0
2021	247,901	103.9	100.2
2022	256,536	107.5	100.7
2023	264,046	110.7	101.6
2024	271,233	113.7	102.5
2025	277,140	116.1	103.1

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Population of Sussex County, Delaware on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	238,627	+1,248	−345	+6	+1,790
2021	247,901	+9,274	−1,114	+138	+11,069
2022	256,536	+8,635	−1,107	+699	+8,473
2023	264,046	+7,510	−1,009	+1,244	+7,004
2024	271,233	+7,187	−943	+1,599	+6,366
2025	277,140	+5,907	−1,011	+639	+6,287

Age, 2020–2024

The median age is 51.9 ±0.2: for men 50.1 ±0.1 and for women 53.6 ±0.2. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Sussex County by age, ACS 2020–2024
Age	People	Share	Delaware	United States
Under 5	12,138 ±89	4.7% ±<0.1	5.3% ±<0.1	5.6% ±<0.1
5 to 17	34,118 ±1,176	13.3% ±0.5	15.4% ±0.2	16.3% ±<0.1
18 to 24	15,662 ±791	6.1% ±0.3	8.5% ±0.2	9.1% ±<0.1
25 to 44	49,004 ±986	19.2% ±0.4	24.8% ±0.2	26.9% ±<0.1
45 to 64	67,455 ±1,268	26.4% ±0.5	25.4% ±0.3	24.8% ±<0.1
65 and over	77,249 ±1,605	30.2% ±0.6	20.6% ±0.3	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $81,497 ±$1,512, and income per person $46,684 ±$1,039, in 2024 dollars. The median is $84,954 ±$1,251 in Delaware and $80,734 ±$166 in the United States.

Households by income

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Households in Sussex County by income, ACS 2020–2024
Household income	Households	Share	Delaware	United States
Under $25,000	12,848 ±987	12.1% ±0.9	11.9% ±0.5	14.6% ±<0.1
$25,000 to $49,999	18,988 ±1,204	17.8% ±1.1	16.4% ±0.6	16.7% ±<0.1
$50,000 to $74,999	17,066 ±940	16.0% ±0.9	15.9% ±0.5	15.5% ±<0.1
$75,000 to $99,999	15,564 ±848	14.6% ±0.8	13.5% ±0.5	12.6% ±<0.1
$100,000 to $149,999	19,305 ±964	18.1% ±0.9	19.0% ±0.6	17.5% ±<0.1
$150,000 to $199,999	10,738 ±681	10.1% ±0.6	10.9% ±0.4	9.6% ±<0.1
$200,000 or more	11,932 ±744	11.2% ±0.7	12.4% ±0.4	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 Sussex County by age, ACS 2020–2024
Age	Below poverty	Rate	Delaware	United States
All ages	27,441 ±2,202	10.9% ±0.9	10.4% ±0.4	12.5% ±0.1
Under 18	8,588 ±1,023	18.9% ±2.2	15.0% ±0.9	16.1% ±0.1
18 to 59	11,374 ±1,090	10.6% ±1.0	9.6% ±0.4	11.6% ±0.1
60 and over	7,479 ±723	7.5% ±0.7	8.5% ±0.5	11.0% ±<0.1

Housing, 2020–2024

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Housing in Sussex County, ACS 2020–2024
Measure	Sussex County	Delaware	United States
Housing units	151,799 ±115	464,203 ±208	143,775,355 ±10,234
Occupied	70.1% ±0.8	86.6% ±0.4	89.9% ±0.1
Vacant	29.9% ±0.7	13.4% ±0.3	10.1% ±0.1
Owner occupied	81.6% ±0.9	73.0% ±0.6	65.2% ±0.3
Renter occupied	18.4% ±1.1	27.0% ±0.5	34.8% ±0.1
Median home value	$382,600 ±$6,986	$352,000 ±$2,842	$332,700 ±$236
Median gross rent	$1,238 ±$42	$1,401 ±$16	$1,413 ±$2
Median year built	1999 ±1	1987 ±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 Sussex County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Delaware	United States
Hispanic or Latino	29,438 ±0	11.5% ±<0.1	11.0% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	184,909 ±700	72.3% ±0.3	58.1% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	25,014 ±910	9.8% ±0.4	21.4% ±0.2	11.9% ±<0.1
Asian alone, not Hispanic	3,242 ±227	1.3% ±0.1	4.3% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	500 ±144	0.2% ±0.1	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 30	0% to < 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	1,331 ±491	0.5% ±0.2	0.5% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	11,192 ±1,039	4.4% ±0.4	4.5% ±0.2	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 Sussex County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Delaware	United States
Born in the state	92,007 ±2,150	36.0% ±0.8	42.9% ±0.4	57.3% ±<0.1
Born in another state	139,934 ±2,400	54.7% ±0.9	44.7% ±0.5	26.9% ±<0.1
Born a citizen outside the states	2,293 ±373	0.9% ±0.1	1.7% ±0.2	1.7% ±<0.1
Born abroad	21,392 ±1,246	8.4% ±0.5	10.7% ±0.3	14.1% ±<0.1
Naturalized citizens	9,766 ±876	3.8% ±0.3	5.8% ±0.3	7.4% ±<0.1
Not citizens	11,626 ±1,256	4.5% ±0.5	4.9% ±0.3	6.8% ±<0.1

Sussex County among the counties of Delaware

2nd of 3 by population, July 2025. Every one is listed on the Delaware page.

Counties of Delaware near Sussex County in population, July 2025
County	July 2025	Change since 2020
New Castle County	588,026	+3.0%
Sussex County	277,140	+16.1%
Kent County	194,786	+6.8%

Elsewhere on the site

Rankings this appears in

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

Compiled automatically from Census Bureau population estimates — counties and Puerto Rico municipios, with components of change and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026