Frankfort is home to 20,651 people in Illinois. That is roughly 85% ahead of the Illinois median. The population has more than doubled since 2000, adding 10,260 people. 95% of homes are owner-occupied. This is an unusually credentialed place: 59% of adults have a four-year degree. The median household earns $154,375, about 88% above the national median.
At a glance
Wealthier
median household income $154,375, above the US median
US median: $82,259
Older
median age 42.2
US median: 38.9
More educated
59% hold a bachelor's degree
US average: 36%
Stable housing
home values roughly flat, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about Frankfort
What changed most since 1990
Population7,180 → 20,651(+188%)US over the same years: +35%
Adults with a bachelor's degree31.6% → 59.3%(+27.7 pts)US over the same years: +15.3 pts
Black share0.1% → 10.2%(+10.1 pts)US over the same years: +0.2 pts
Frankfort's population equals 2.9% of Will County's. Its number of residents living in poverty equals 1.3% of the county's. Its number of foreign-born residents equals 1.4% of the county's.
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)22.7%(139)
US avg: 26.4%
Gulf War (1990s)25.4%(156)
US avg: 24.3%
Vietnam era29%(178)
US avg: 33.1%
Korean War4.7%(29)
US avg: 4.5%
World War II0%(0)
US avg: 1%
Share of the 613 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
Frankfort, decade by decade
Frankfort 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
7,180
$145,202
$390,731
31.6%
6.0
2000
10,391
$151,298
$446,305
40.7%
18.3
2010
17,782
$168,743
$595,424
54.3%
32.4
2020
20,296
$170,571
$455,848
56.8%
44.2
2024
20,651
$154,375
$481,200
59.3%
52.2
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.
