Mercer County, IL demographics:
population, income, and more

Total population
15,495
-0.8% year-over-year change
Median household income
$74,182/yr
3.5% year-over-year change
Housing units
7,285
0.1% year-over-year change

Mercer County population

How many people live in Mercer County

Mercer County is home to 15,495 residents, according to the most recent Census data. Gender-wise, 50.5% of Mercer County locals are male, and 49.5% are female.

Total population
15,495
-0.8% year-over-year change
Gender ratio
Male
50.5%
7,830
Female
49.5%
7,665
Value Percent YoY change
Male 7,830 50.5% -0.7%
Female 7,665 49.5% -0.9%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Mercer County is 45, with the population distributed as follows: about 16.7% are children under 15, then 11.5% are in the 15 to 24 age group. Adults between 25 and 44 make up 22.4% of the population, while another 27.5% fall into the 45 to 64 bracket. Finally, around 21.9% are 65 or older.

Median age
44.7
Age breakdown
Under 15
16.7%
15 to 24
11.5%
25 to 44
22.4%
45 to 64
27.5%
Over 65
21.9%
Value Percent YoY change
Under 15 2,587 16.7% -2.0%
15 to 24 1,785 11.5% -2.4%
25 to 44 3,476 22.4% -0.4%
45 to 64 4,258 27.5% -1.2%
Over 65 3,389 21.9% 1.1%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Mercer County, 98.5% of the population are US-born citizens, while 1.2% have gained naturalized citizenship. At the same time, 0.4% of residents are non-citizens. As for race, 94.2% of locals are Caucasian, 0.6% are African American and 0.4% have Asian roots. There’s also a share of 3.7% that includes residents with two or more races.

Citizenship
U.S.-born citizens
98.5%
Non-U.S.-born citizens
1.2%
Non-citizens
0.4%
Value Percent YoY change
U.S.-born citizens 15,261 98.5% -0.8%
Non-U.S.-born citizens 180 1.2% -1.6%
Non-citizens 54 0.4% 22.7%
Racial breakdown
White
94.2%
Black or African American
0.6%
American Indian and Alaska Native
0.1%
Asian
0.4%
Native Hawaiian and other Pacific Islander
0%
Two or more races
3.7%
Other
1.1%
Value Percent
White 14,589 94.2%
Black or African American 93 0.6%
American Indian and Alaska Native 14 0.1%
Asian 56 0.4%
Two or more races 569 3.7%
Other 174 1.1%

Households in Mercer County

A peek inside Mercer County households

Mercer County has 6,565 households, with an average of 2 members in each. Of these, 69% are families, while the remaining 31% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
6,565
2.4% year-over-year change
Average people per household
2
Non-family households
2,038
Family households
4,527
Value Percent YoY change
Non-family households 2,038 31% 6.4%
Family households 4,527 69% 0.7%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Mercer County

The housing landscape of Mercer County

Mercer County's housing consists of 7,285 units, with 87.9% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 1% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 2.9% of the housing landscape.

Housing units
7,285
0.1% year-over-year change
Housing types
Value Percent
1 unit, detached 6,406 87.9%
1 unit, attached 75 1%
2 units 50 0.7%
3 or 4 units 210 2.9%
5 to 9 units 201 2.8%
10 to 19 units 39 0.5%
20 to 49 units 21 0.3%
50 or more units 68 0.9%
Mobile home 213 2.9%
Boat, RV, van, etc. 2 0%
Homes built since 2020
14
-6.7% year-over-year change

The age of buildings in Mercer County

In Mercer County, the median construction year is 1962. About 30.6% of homes were built before the 1940s, with another 6.4% going up by 1949. Most development happened in the second half of the 20th century. Then, 6.8% of homes were added from 2000 to 2009, 3% between 2010 and 2019, and 0.2% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 2,231 30.6% -9.8%
Built between 1940 and 1949 468 6.4% -1.5%
Built between 1950 and 1959 773 10.6% 15.4%
Built between 1960 and 1969 862 11.8% 13.9%
Built between 1970 and 1979 1,300 17.8% 1.9%
Built between 1980 and 1989 379 5.2% 17.0%
Built between 1990 and 1999 543 7.4% -10.8%
Built between 2000 and 2009 497 6.8% 7.6%
Built between 2010 and 2019 218 3% -0.5%
Built in 2020 or later 14 0.2% -6.7%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Mercer County occupancy rates

Out of the 6,565 occupied housing units in Mercer County, 83.8% are owner-occupied, while 16.2% are lived in by tenants. Meanwhile, 9.9% of all homes on the local market sit vacant.

Occupied housing units
6,565
2.4% year-over-year change
Occupancy breakdown
Renter occupied
1,066
Owner occupied
5,499
Value Percent YoY
change
Renter occupied 1,066 16.2% -3.8%
Owner occupied 5,499 83.8% 3.7%
Unoccupied housing units
9.9%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Mercer County housing costs

Housing costs in Mercer County come to a median of $899 per month, while tenants specifically pay a median gross rent of $786.

Median housing costs per month
$899/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Mercer County
$786/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Mercer County

Mercer County education at a glance

About 44.4% of the population in Mercer County went to high school, while 22% pursued college studies. Another 12.7% earned an associate degree and 12.6% hold a bachelor’s. Meanwhile, 6.4% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 225 1.8% -9.3%
High school diploma 5,447 44.4% -4.9%
College diploma 2,696 22% -3.1%
Associate degree 1,561 12.7% 8.5%
Bachelor's degree 1,549 12.6% 8.8%
Graduate degree 787 6.4% 11.9%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Mercer County

How much people earn in Mercer County

The average annual household income in Mercer County was $92,846 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +5.8% change from the previous year. At the same time, the median income stood at $74,182, reflecting a +3.4% shift over the same period.

Average household income in Mercer County
$92,846/year
5.8% year-over-year change
Median household income in Mercer County
$74,182/year
3.5% year-over-year change

Mercer County income by age

In Mercer County, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $88,214. Those with someone between 45 and 64 in charge, often well established professionally, earn $93,523 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $33,906, while those led by someone over 65, many of whom may be retired, have about $56,848 in earnings. Overall, 91.1% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $33,906 10.2%
25 - 44 $88,214 8.0%
45 - 64 $93,523 5.2%
Over 65 $56,848 3.9%
Above poverty level
13,813
Below poverty level
1,346
Value Percent YoY
change
Above poverty level 13,813 91.1% -2.0%
Below poverty level 1,346 8.9% 12.3%

Employment in Mercer County

Workforce and job types in Mercer County

The job market in Mercer County is powered by 7,407 working residents, spread across a range of industries and roles. 68.2% of the working population are employed in professional or administrative positions, while 31.8% are in hands-on or service-based jobs. Also, 10.1% run their own businesses, 68.8% are employed by private companies, and 14.1% work in the public sector.

Workforce demographics

Working population
7,407
0.1% year-over-year change
White collar
5,051
Blue collar
2,356
Value Percent YoY change
White collar 5,051 68.2% 0.6%
Blue collar 2,356 31.8% -0.8%
Employer type
Self employees
10.1%
Private companies
68.8%
Governmental workers
14.1%
Not for profit companies
7.1%
Value Percent YoY change
Self employees 745 10.1% 3.9%
Private companies 5,094 68.8% -1.6%
Governmental workers 1,044 14.1% 9.6%
Not for profit companies 524 7.1% -4.7%
Unemployment rate
3.2%
3.4% year-over-year change

Available workforce

The unemployment rate in Mercer County stands at 3.2%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in Mercer County

How people get around in Mercer County

In Mercer County, the average commute time is 28 minutes. Commuting methods vary: 87.1% of residents travel by personal vehicle and 2.4% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Commute time
28 min
Means of transportation
Value Percent YoY change
Car 6,327 87.1% -2.5%
Walk 172 2.4% 8.9%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Mercer County by zipcode?

Zipcode Population Number of households Median income Average income
61231 4,962 2,128 $70,991 $83,801
61260 737 371 $41,645 $65,545
61263 657 272 $86,500 $88,217
61272 1,437 586 $64,167 $86,809
61276 88 34 $87,750 $100,859
61412 1,392 558 $82,143 $97,879
61442 504 274 $48,750 $83,474
61465 1,192 546 $56,875 $81,273
61279 1,015 378 $87,656 $106,818
61281 2,520 965 $102,639 $123,435

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FAQs about Mercer County demographics 

What is the total population of Mercer County?

Mercer County has a total population of 15,495 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by -0.8% compared to a year ago.

What is the gender ratio in Mercer County?

The gender ratio in Mercer County is as follows:
  • 50.5% males (7,830 residents)
  • 49.5% females (7,665 residents)

What is the median age in Mercer County?

The median age in Mercer County is 44.7.

What is the age distribution of the population in Mercer County?

The age distribution in Mercer County is as follows:
  • Under 15: 16.7% (2,587 residents)
  • Ages 15-24: 11.5% (1,785 residents)
  • Ages 25-44: 22.4% (3,476 residents)
  • Ages 45-64: 27.5% (4,258 residents)
  • Over 65: 21.9% (3,389 residents)

What is the racial and ethnic makeup of Mercer County?

The racial and ethnic makeup of Mercer County is as follows:
  • White: 94.2% (14,589 residents)
  • Black or African American: 0.6% (93 residents)
  • American Indian and Alaska Native: 0.1% (14 residents)
  • Asian: 0.4% (56 residents)
  • Native Hawaiian and Other Pacific Islander: 0% (0 residents)
  • Two or More Races: 3.7% (569 residents)
  • Other: 1.1% (174 residents)

What percentage of the population in Mercer County are U.S.-born citizens?

U.S.-born citizens represent 98.5% of the population in Mercer County.

How many housing units are there in Mercer County?

There are 7,285 housing units in Mercer County, reflecting a +0.1% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Mercer County and what is the average household size?

Mercer County has a total of 6,565 households, with an average of 2 people in each.

What is the median household income in Mercer County?

Mercer County has a median household income of $74,182, representing a +3.5% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for Mercer County?

The employment rate is 96.8% in Mercer County, with a workforce of 7,407 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 68.2% (5,051 residents)
  • Blue-collar workers: 31.8% (2,356 residents)

Places of employment:
  • Self-employed: 10.1% (745 residents)
  • Private companies: 68.8% (5,094 residents)
  • Governmental workers: 14.1% (1,044 residents)
  • Not-for-profit companies: 7.1% (524 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025