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Putnam County, IL
6 cities and towns and 7 ZIP codes in Putnam County, Illinois.
Population
5,601
Land area
160sq mi
People per sq mi
35
ZIP codes
7
Cities and towns in Putnam County
Putnam County at a glance
- Putnam County is 85% less dense than Illinois as a whole.
- Households here earn a median of $75,590 a year, 9% less than the Illinois figure of $83,390.
- A typical owner-occupied home is valued at $172,700 (34% below Illinois) and median rent is $851 a month.
- The biggest population centers are Granville (1,472), Hennepin (929) and Mark (574).
Local data for Putnam County, IL
Counts from official public data
Housing and community stats
Putnam County, IL, American Community Survey 2020-2024
Median household income
$75,590
Poverty rate
8.1%
Median home value
$172,700
Prices +25.1% in a year
Median rent
$851/mo
Homeownership
81.5%
Bachelor's or higher
22.9%
Median age
47.4
Average commute
28.1 min
Largest reported origins and ancestries: German Americans (1,757), Italian Americans (791), Irish Americans (719).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
3.6%
Sep 2026, -1.3 pts in a year
Average annual pay
$73,073
2,002 jobs, 2025
Income per person
$73,151
BEA, 2024
Federal spending
$42.4M
FY 2026, $7,522 per person
PPP loans
$20.1M
296 loans, 1,822 jobs reported
Campaign donations
$42.6K
Itemized, 2026 cycle
How people get to work
Putnam County, IL, workers 16 and older. American Community Survey 5-year estimates
- Drove alone87.3%
- Carpooled3.9%
- Public transit0.4%
- Walked0.4%
- Bicycle0.2%
- Taxi, ride-hailing, motorcycle or other0.5%
- Worked from home7.2%
Average one-way commute: 28.1 minutes for people who do not work from home.
Environment and hazard risk
Putnam County, IL, from FEMA, NOAA and EPA
Natural hazard risk
Very Low
Top: drought
Storm events since 1996
359
Most often thunderstorm wind
Flood insurance policies
10
0.3% of homes, county
July high / Jan low
85° / 17°F
38.6 inches of rain a year
Hazards, floods and storm historyCheck a flood zone3 historic places
Health statistics
Share of adults in Putnam County, IL, CDC PLACES estimates
Obesity
36.1%
U.S. 33.3% +2.8 pts
Diabetes
12.1%
U.S. 12.1% about the same
Smoking
13.1%
U.S. 12.8% about the same
Uninsured (18-64)
7.4%
U.S. 11.1% -3.7 pts
Cities, towns and ZIP codes in Putnam County
Population shown
Frequently asked questions
- What is the largest city in Putnam County, IL?
- Granville is the largest city or town in Putnam County, with about 1,472 residents.
- How many ZIP codes are in Putnam County?
- Putnam County includes 7 ZIP Code Tabulation Areas, including 61326, 61327, 61335, 61336, 61340.
- What is the population of Putnam County, IL?
- About 5,601 people live in Putnam County, based on American Community Survey 5-year estimates.
- What counties border Putnam County?
- Putnam County borders LaSalle County, Bureau County, Marshall County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023