Share of the population by age and sex, five-year groups

Population of Delaware, 2010–2025 · click to pick a year
Estimates up to 2019 are built on the 2010 Census, those from 2020 on the 2020 Census. A line that steps up or down between 2019 and 2020 reflects this re-basing, not a sudden change in population.

Year

-5 -1   2021  +1 +5

1,005,130 people lived in Delaware on July 1, 2021: the 45th-largest population among the 50 states and the District of Columbia. The median age was 41.4 years (United States: 38.9); more residents are 65 or older (20.3%) than under 15 (17.0%): an ageing, top-heavy pyramid. There were 92.8 men for every 100 women. Since 2010 the population has grown by 11.7%. Source: U.S. Census Bureau, Population Estimates Program, Vintage 2025 estimates (resident population on July 1; public domain). Median age, shares, dependency ratios and rankings are calculated by PopulationPyramid.net from these estimates; the Census Bureau does not endorse this site.

Key indicators, 2021
Population
1,005,130
Rank by population
45th of 51
Median age
41.4
Men per 100 women
92.8
Under 15
17.0%
15–64
62.7%
65 and over
20.3%
Child dependency
27.1
Old-age dependency
32.3
Change since 2010
+11.7%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2021
AgeMenWomenTotalShare
0-427,26625,99753,2635.3%
5-928,73528,11056,8455.7%
10-1430,89229,89760,7896.0%
15-1931,22430,38761,6116.1%
20-2434,54834,12168,6696.8%
25-2929,74630,26160,0076.0%
30-3430,56032,16462,7246.2%
35-3930,03531,61261,6476.1%
40-4427,70630,06257,7685.7%
45-4925,65627,94853,6045.3%
50-5429,53632,38761,9236.2%
55-5933,03136,70169,7326.9%
60-6433,62339,14372,7667.2%
65-6930,70236,11466,8166.6%
70-7426,29031,03157,3215.7%
75-7917,03720,41137,4483.7%
80-849,79512,65422,4492.2%
85+7,41412,33419,7482.0%
How Delaware compares with similar-sized states, 2021
RankStateResidentsRelative
42 Maine 1,379,009
43 Montana 1,106,416
44 Rhode Island 1,097,381
45 Delaware 1,005,130
46 South Dakota 896,303
47 North Dakota 777,977
48 Alaska 734,590
Frequently asked questions about Delaware's population
What is the population of Delaware?
Delaware had an estimated 1,005,130 residents on July 1, 2021, according to the U.S. Census Bureau, Population Estimates Program. That ranks 45th among the 51 states and the District of Columbia.
What is the median age in Delaware?
The median age in Delaware was 41.4 years in 2021, the 6th oldest of the 51 states and DC. That is 2.5 years older than the national median of 38.9.
How many people in Delaware are 65 or older?
About 203,782 residents of Delaware (20.3%) were 65 or older in 2021, against 17.0% under 15 and 62.7% aged 15 to 64.
What does the population pyramid of Delaware show?
In 2021, Delaware: more residents are 65 or older (20.3%) than under 15 (17.0%): an ageing, top-heavy pyramid. There were 92.8 men for every 100 women.
How fast is the population of Delaware changing?
The population of Delaware grew by 11.7% between 2010 and 2021, and by 1.3% in the last year.
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