Putnam County, Illinois
Putnam County, Illinois, has 5,619 residents (July 2025 estimate). Its county seat is Hennepin. It uses Central Time and covers 160 sq mi (415 km²) of land.
- Resident population, July 2025
- 5,619
- Land area
- 160 sq mi (415 km²)
- County seat or government
- Hennepin
- Time zone
- Central TimeUTC-06:00 in January; UTC-05:00 in July
- Median household income
- $75,590 ± $4,927
- Median home value
- $172,700 ± $10,245
- Median rent, with utilities
- $851 ± $53
- Homes lived in by their owners
- 81.5% ± 2.3 points
- County type
- County
- Metro or micro area
- Ottawa, IL micro areaOutlying county
- Water area
- 12 sq mi (31.2 km²)
- State
- Illinois
- County code (FIPS)
- 17155
- Coordinates (central point)
- 41.198961, -89.298347
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Putnam County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Central TimeAmerica/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 613261,953 people
- 613271,442 people
- 61334738 people
- 61336694 people
- 61340545 people
- 61560477 people
- 61335312 people
- 61363250 people
8 ZIP Code areas overlap Putnam County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
Putnam County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Townships in Putnam County, largest first
- Granville Township2,748 people
- Hennepin Township1,442 people
- Magnolia Township934 people
- Senachwine Township477 people
People counts are American Community Survey 2020–2024 5-year estimates. All townships in Illinois, by county
School districts in Putnam County, largest first
- Princeton High School District 50012,182 people
- Princeton Elementary School District 11511,401 people
- Putnam County Community Unit School District 5355,133 people
- Henry-Senachwine Consolidated Unit School District 53,410 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Granville, Illinois (village)1,472 people
- Hennepin, Illinois (village)929 people
- Mark, Illinois (village)574 people
- Standard, Illinois (village)250 people
- McNabb, Illinois (village)233 people
- Magnolia, Illinois (village)232 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Marshall County, Illinois12 mi south
- Bureau County, Illinois18 mi northwest
- LaSalle County, Illinois24 mi northeast
Before using this answer on a form
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