St. Joseph, IL demographics:
population, income, and more

Total population
3,778
-1.4% year-over-year change
Median household income
$120,789/yr
5.4% year-over-year change
Housing units
1,470
-2.7% year-over-year change

St. Joseph population

How many people live in St. Joseph

St. Joseph is home to 3,778 residents, according to the most recent Census data. Gender-wise, 47.6% of St. Joseph locals are male, and 52.4% are female.

Total population
3,778
-1.4% year-over-year change
Gender ratio
Male
47.6%
1,799
Female
52.4%
1,979
Value Percent YoY change
Male 1,799 47.6% 1.8%
Female 1,979 52.4% -4.2%
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 St. Joseph is 38, with the population distributed as follows: about 21.8% are children under 15, then 14.4% are in the 15 to 24 age group. Adults between 25 and 44 make up 24.2% of the population, while another 23.6% fall into the 45 to 64 bracket. Finally, around 16% are 65 or older.

Median age
37.9
Age breakdown
Under 15
21.8%
15 to 24
14.4%
25 to 44
24.2%
45 to 64
23.6%
Over 65
16%
Value Percent YoY change
Under 15 823 21.8% 13.7%
15 to 24 544 14.4% -2.2%
25 to 44 915 24.2% -2.1%
45 to 64 891 23.6% -16.4%
Over 65 605 16% 9.6%
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 St. Joseph, 96.3% of the population are US-born citizens, while 2.4% have gained naturalized citizenship. At the same time, 1.3% of residents are non-citizens. There’s also a share of 5.7% that includes residents with two or more races.

Citizenship
U.S.-born citizens
96.3%
Non-U.S.-born citizens
2.4%
Non-citizens
1.3%
Value Percent YoY change
U.S.-born citizens 3,639 96.3% 0.2%
Non-U.S.-born citizens 91 2.4% -36.4%
Non-citizens 48 1.3% -20.0%
Racial breakdown
White
92.5%
Black or African American
0%
American Indian and Alaska Native
0.2%
Asian
1.6%
Native Hawaiian and other Pacific Islander
0%
Two or more races
5.7%
Other
0%
Value Percent
White 3,493 92.5%
American Indian and Alaska Native 6 0.2%
Asian 62 1.6%
Two or more races 217 5.7%

Households in St. Joseph

A peek inside St. Joseph households

St. Joseph has 1,462 households, with an average of 3 members in each. Of these, 61.1% are families, while the remaining 38.9% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
1,462
-2.7% year-over-year change
Average people per household
3
Non-family households
569
Family households
893
Value Percent YoY change
Non-family households 569 38.9% -3.4%
Family households 893 61.1% -2.3%
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 St. Joseph

The housing landscape of St. Joseph

St. Joseph's housing consists of 1,470 units, with 89.9% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 3.4% and offer a more compact, shared living style.

Housing units
1,470
-2.7% year-over-year change
Housing types
Value Percent
1 unit, detached 1,321 89.9%
1 unit, attached 50 3.4%
2 units 35 2.4%
3 or 4 units 31 2.1%
5 to 9 units 23 1.6%
10 to 19 units 10 0.7%
Homes built since 2020
0
% year-over-year change

The age of buildings in St. Joseph

In St. Joseph, the median construction year is 1996. About 6.2% of homes were built before the 1940s, with another 1.2% going up by 1949. Most development happened in the second half of the 20th century.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 91 6.2% -6.2%
Built between 1940 and 1949 17 1.2% -5.6%
Built between 1950 and 1959 84 5.7% 1.2%
Built between 1960 and 1969 77 5.2% -22.2%
Built between 1970 and 1979 242 16.5% -2.0%
Built between 1980 and 1989 73 5% -6.4%
Built between 1990 and 1999 251 17.1% 6.8%
Built between 2000 and 2009 579 39.4% -6.0%
Built between 2010 and 2019 56 3.8% 47.4%
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.

St. Joseph occupancy rates

Out of the 1,462 occupied housing units in St. Joseph, 84.8% are owner-occupied, while 15.2% are lived in by tenants. Meanwhile, 0.5% of all homes on the local market sit vacant.

Occupied housing units
1,462
-2.7% year-over-year change
Occupancy breakdown
Renter occupied
223
Owner occupied
1,239
Value Percent YoY
change
Renter occupied 223 15.2% 4.2%
Owner occupied 1,239 84.8% -3.9%
Unoccupied housing units
0.5%
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.

St. Joseph housing costs

Housing costs in St. Joseph come to a median of $1,217 per month, while tenants specifically pay a median gross rent of $968.

Median housing costs per month
$1,217/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 St. Joseph
$968/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 St. Joseph

St. Joseph education at a glance

About 22.7% of the population in St. Joseph went to high school, while 22.8% pursued college studies. Another 20% earned an associate degree and 22.5% hold a bachelor’s. Meanwhile, 11.7% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 9 0.3% 0.0%
High school diploma 614 22.7% -12.4%
College diploma 619 22.8% 5.5%
Associate degree 541 20% -4.9%
Bachelor's degree 609 22.5% 6.1%
Graduate degree 317 11.7% -19.3%
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 St. Joseph

How much people earn in St. Joseph

The average annual household income in St. Joseph was $130,563 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +3.1% change from the previous year. At the same time, the median income stood at $120,789, reflecting a +5.4% shift over the same period.

Average household income in St. Joseph
$130,563/year
3.1% year-over-year change
Median household income in St. Joseph
$120,789/year
5.4% year-over-year change

St. Joseph income by age

In St. Joseph, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $166,600. Those with someone between 45 and 64 in charge, often well established professionally, earn $154,318 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $132,670, while those led by someone over 65, many of whom may be retired, have about $60,156 in earnings. Overall, 95.9% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $132,670 20.9%
25 - 44 $166,600 2.2%
45 - 64 $154,318 12.8%
Over 65 $60,156 18.2%
Above poverty level
3,622
Below poverty level
156
Value Percent YoY
change
Above poverty level 3,622 95.9% -1.2%
Below poverty level 156 4.1% -5.5%

Average renter income in St. Joseph

To get a better sense of what renters earn on average in St. Joseph, their median household income was $37,074 according to 2022 Census data. In addition, the rent-to-income ratio in the area, at 31.3%, shows what portion of their earnings goes toward housing expenses.

Renter median household income
$37,074
Rent-to-income ratio
31.3%
Understanding the rent-to-income ratio can help renters gauge if local housing costs align with their earnings. A ratio under 30% usually signals affordability, while exceeding this mark means rent is taking a larger-than-recommended bite out of income. That could make it harder for you to cover other costs like transportation, healthcare, or child care.

Employment in St. Joseph

Workforce and job types in St. Joseph

The job market in St. Joseph is powered by 2,073 working residents, spread across a range of industries and roles. 87.3% of the working population are employed in professional or administrative positions, while 12.7% are in hands-on or service-based jobs. Also, 6.8% run their own businesses, 59.1% are employed by private companies, and 26.4% work in the public sector.

Workforce demographics

Working population
2,073
-4.0% year-over-year change
White collar
1,810
Blue collar
263
Value Percent YoY change
White collar 1,810 87.3% -4.8%
Blue collar 263 12.7% 1.5%
Employer type
Self employees
6.8%
Private companies
59.1%
Governmental workers
26.4%
Not for profit companies
7.7%
Value Percent YoY change
Self employees 140 6.8% 16.7%
Private companies 1,226 59.1% -5.9%
Governmental workers 547 26.4% -0.4%
Not for profit companies 160 7.7% -14.9%
Unemployment rate
0.9%
26.7% year-over-year change

Available workforce

The unemployment rate in St. Joseph stands at 0.9%, 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 St. Joseph

How people get around in St. Joseph

Commuting methods vary: 81.7% of residents travel by personal vehicle and 0.7% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Means of transportation
Value Percent YoY change
Car 1,689 81.7% -3.5%
Walk 14 0.7% N/A
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 St. Joseph by zipcode?

Zipcode Population Number of households Median income Average income
61873 5,779 2,203 $117,578 $126,408

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FAQs about St. Joseph demographics 

What is the total population of St. Joseph?

St. Joseph has a total population of 3,778 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 -1.4% compared to a year ago.

What is the gender ratio in St. Joseph?

The gender ratio in St. Joseph is as follows:
  • 47.6% males (1,799 residents)
  • 52.4% females (1,979 residents)

What is the median age in St. Joseph?

The median age in St. Joseph is 37.9.

What is the age distribution of the population in St. Joseph?

The age distribution in St. Joseph is as follows:
  • Under 15: 21.8% (823 residents)
  • Ages 15-24: 14.4% (544 residents)
  • Ages 25-44: 24.2% (915 residents)
  • Ages 45-64: 23.6% (891 residents)
  • Over 65: 16% (605 residents)

What is the racial and ethnic makeup of St. Joseph?

The racial and ethnic makeup of St. Joseph is as follows:
  • White: 92.5% (3,493 residents)
  • Black or African American: 0% (0 residents)
  • American Indian and Alaska Native: 0.2% (6 residents)
  • Asian: 1.6% (62 residents)
  • Native Hawaiian and Other Pacific Islander: 0% (0 residents)
  • Two or More Races: 5.7% (217 residents)
  • Other: 0% (0 residents)

What percentage of the population in St. Joseph are U.S.-born citizens?

U.S.-born citizens represent 96.3% of the population in St. Joseph.

How many housing units are there in St. Joseph?

There are 1,470 housing units in St. Joseph, reflecting a -2.7% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in St. Joseph and what is the average household size?

St. Joseph has a total of 1,462 households, with an average of 3 people in each.

What is the median household income in St. Joseph?

St. Joseph has a median household income of $120,789, representing a +5.4% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for St. Joseph?

The employment rate is 99.1% in St. Joseph, with a workforce of 2,073 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 87.3% (1,810 residents)
  • Blue-collar workers: 12.7% (263 residents)

Places of employment:
  • Self-employed: 6.8% (140 residents)
  • Private companies: 59.1% (1,226 residents)
  • Governmental workers: 26.4% (547 residents)
  • Not-for-profit companies: 7.7% (160 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