Checked
Johnson County, IL
7 cities and towns and 7 ZIP codes in Johnson County, Illinois.
Population
13,376
Land area
344sq mi
People per sq mi
39
ZIP codes
7
Cities and towns in Johnson County
Johnson County at a glance
- Johnson County is 83% less dense than Illinois as a whole.
- Households here earn a median of $62,528 a year, 25% less than the Illinois figure of $83,390.
- A typical owner-occupied home is valued at $160,500 (39% below Illinois) and median rent is $781 a month.
- The biggest population centers are Vienna (1,873), Goreville (1,236) and Buncombe (329).
Local data for Johnson County, IL
Counts from official public data
Housing and community stats
Johnson County, IL, American Community Survey 2020-2024
Median household income
$62,528
Poverty rate
17.6%
Median home value
$160,500
Prices +3.1% in a year
Median rent
$781/mo
Homeownership
82.0%
Bachelor's or higher
19.6%
Median age
41.4
Average commute
28.4 min
Largest reported origins and ancestries: German Americans (1,856), Irish Americans (1,396), Mexican Americans (443).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
4.5%
Aug 2026, -0.9 pts in a year
Average annual pay
$61,127
2,715 jobs, 2025
Income per person
$44,062
BEA, 2024
Federal spending
$84.34M
FY 2026, $6,338 per person
PPP loans
$9.93M
417 loans, 1,536 jobs reported
Campaign donations
$21.19K
Itemized, 2026 cycle
How people get to work
Johnson County, IL, workers 16 and older. American Community Survey 5-year estimates
- Drove alone84.8%
- Carpooled8.1%
- Public transit0.0%
- Walked0.9%
- Bicycle0.0%
- Taxi, ride-hailing, motorcycle or other1.3%
- Worked from home4.8%
Average one-way commute: 28.4 minutes for people who do not work from home.
Environment and hazard risk
Johnson County, IL, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Low
Top: earthquake
Storm events since 1996
685
Most often dense fog
Flood insurance policies
5
0.1% of homes, county
July high / Jan low
88° / 26°F
50.5 inches of rain a year
Hazards, floods and storm historyCheck a flood zone3 historic places
Health statistics
Share of adults in Johnson County, IL, CDC PLACES estimates
Obesity
41.4%
U.S. 33.3% +8.1 pts
Diabetes
12.9%
U.S. 12.1% +0.8 pts
Smoking
16.8%
U.S. 12.8% +4.0 pts
Uninsured (18-64)
10.4%
U.S. 11.1% -0.7 pts
Cities, towns and ZIP codes in Johnson County
Population shown
Frequently asked questions
- What is the largest city in Johnson County, IL?
- Vienna is the largest city or town in Johnson County, with about 1,873 residents.
- How many ZIP codes are in Johnson County?
- Johnson County includes 7 ZIP Code Tabulation Areas, including 62912, 62923, 62939, 62943, 62967.
- What is the population of Johnson County, IL?
- About 13,376 people live in Johnson County, based on American Community Survey 5-year estimates.
- What counties border Johnson County?
- Johnson County borders Williamson County, Saline County, Union County, Massac County, Pulaski County, Pope County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023