Adelphi is home to 17,395 people in Maryland. The foreign-born share is 56%. 42% of homes are owner-occupied. This skews young, with a median age of 33.9. There are 6,395 people per square mile. Getting to work takes 37 minutes on average.
At a glance
Average income
median household income $82,137, near the US median
US median: $82,259
Younger
median age 33.9
US median: 38.9
Less educated
30% hold a bachelor's degree
US average: 36%
Less affordable
home values up 58%, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about Adelphi
What changed most since 1990
Hispanic share9.8% → 54.7%(+44.9 pts)US over the same years: +9.9 pts
Adults with a bachelor's degree42.0% → 30.0%(−12.0 pts)US over the same years: +15.3 pts
Black share38.9% → 24.4%(−14.5 pts)US over the same years: +0.2 pts
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans
Veterans by period of service, 2024
Gulf War (2001 or later)29.9%(115)
US avg: 26.4%
Gulf War (1990s)27%(104)
US avg: 24.3%
Vietnam era23.9%(92)
US avg: 33.1%
Korean War6%(23)
US avg: 4.5%
World War II0%(0)
US avg: 1%
Share of the 385 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Over time
Adelphi, decade by decade
Adelphi population, inflation-adjusted income and home value, education, and diversity by year
Year
Population
Median household income
Median home value
Bachelor's degree+
Diversity score
1990
13,524
$88,925
$338,650
42.0%
83.8
2000
14,998
$83,481
$268,694
37.0%
90.7
2010
15,086
$79,841
$442,936
31.1%
84.6
2020
16,823
$83,044
$387,731
28.4%
80.6
2024
17,395
$82,137
$425,200
30.0%
77.7
Census years come from the decennial census and the latest year from the American Community Survey, so part of any change between those two rows can reflect the different surveys. Dollar figures are adjusted for inflation to 2024 dollars; a figure ending in "+" was at the Census Bureau's reporting cap that year. The diversity score runs from 0 to 100; see how it's calculated.
