Prospect Heights, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Prospect Heights, Illinois is 15,681 as of the 2023 American Community Survey, making it the 159th-largest city in Illinois. The median household income is $91,599, the median home value is $347,500, and the median age is 41.0.
The population has declined 4.3% since 2010 (16,270 → 15,566).
15,681
Population
3727
People / sq mi
$91,599
Median Income
$347,500
Median Home Value
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Prospect Heights covers 4.2 sq mi of land at 3727 people per square mile.
About Prospect Heights, IL
Prospect Heights is distinguished by its share of foreign-born residents, 7.5% of the population. Prospect Heights is a city in Illinois with a population of 15,681.
Median household income is $91,599, above the US median of $78,538. Only 2.9% of residents live in poverty, below the national 12.4%. Homes carry a median value of $347,500, with typical rent around $1,391.
Roughly 36.3% of adults have a bachelor’s, near the national 35.0%. Remote work is on the higher side at 16.3%, above the national 14.0%, and the average commute runs about 26 minutes each way.
Prospect Heights city Population History (2010-2024)
The city of Prospect Heights city had a population of 16,270 in 2010 and 15,566 in 2024, a -4.3% growth over 14 years. The peak was 16,432 in 2014. Average annual growth rate: -0.31%.
15,566
Population (2024)
16,270
Population (2010)
16,432
Peak (2014)
-0.31%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 16,270 |
| 2011 | 16,329 |
| 2012 | 16,378 |
| 2013 | 16,412 |
| 2014 | 16,432 |
| 2015 | 16,392 |
| 2016 | 16,288 |
| 2017 | 16,150 |
| 2018 | 15,992 |
| 2019 | 15,887 |
| 2020 | 15,991 |
| 2021 | 15,708 |
| 2022 | 15,507 |
| 2023 | 15,459 |
| 2024 | 15,566 |
Race & Ethnicity
| White | 62.2% |
| Black or African American | 0.4% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.0% |
| Two or More Races | 0.0% |
Economy & Income
$91,599
Median Household Income
$46,868
Per Capita Income
2.9%
Poverty Rate
3.2%
Unemployment Rate
Housing
$347,500
Median Home Value
$1,391
Median Rent
63.5%
Owner-Occupied
Education
83.8%
High School+
36.3%
Bachelor's+
Commute
1.9%
Drive Alone
70.2%
Public Transit
16.3%
Work From Home
26.4 min
Avg Commute
Community Profile
7.5%
Foreign Born
40.8%
Non-English at Home
3.5%
Veterans
8.6%
With Disability
81.6%
Health Insurance
94.9%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 18.7% |
| Manufacturing | 18.1% |
| Finance, Insurance & Real Estate | 17.8% |
| Construction | 6.7% |
| Education, Health Care & Social Services | 6.6% |
| Retail Trade | 6.3% |
| Arts, Entertainment & Food Services | 5.0% |
| Information | 3.9% |
| Transportation & Warehousing | 3.0% |
| Public Administration | 1.6% |
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Frequently Asked Questions
Prospect Heights, Illinois has a population of 15,681 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 159th-largest city in Illinois.
The median household income in Prospect Heights, Illinois is $91,599, with 2.9% of residents living below the federal poverty level.
The median home value in Prospect Heights, Illinois is $347,500, with median monthly rent at $1,391 and a homeownership rate of 63.5%.
The median age in Prospect Heights, Illinois is 41.0 years. The population is 48.9% male and 51.1% female.
The population has declined 4.3% since 2010 (16,270 → 15,566).
Prospect Heights city, IL Climate
Prospect Heights city, IL has an average annual temperature of 9.5°C (49°F) and receives about 903 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
9.5°C
Avg Temp
903
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -6° / 22° | 42 mm |
| February | -3° / 26° | 35 mm |
| March | 3° / 37° | 64 mm |
| April | 9° / 48° | 92 mm |
| May | 15° / 59° | 88 mm |
| June | 20° / 69° | 98 mm |
| July | 23° / 74° | 95 mm |
| August | 22° / 72° | 106 mm |
| September | 18° / 64° | 91 mm |
| October | 11° / 53° | 63 mm |
| November | 4° / 39° | 71 mm |
| December | -3° / 27° | 58 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Prospect Heights city, IL
The most comfortable months to visit Prospect Heights city, IL are typically June, August and July, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 29°C high). The coldest is January (near -10°C low). August is usually the wettest month.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.