Map of Putnam County, Illinois

Putnam County is the least extensive county in the U.S. state of Illinois. According to the 2010 census, it had a population of 6,006. The county seat is Hennepin. The county was formed in 1825 out of Fulton County and named after Israel Putnam, who was a general in the American Revolution. Putnam County is part of the Ottawa, IL Micropolitan Statistical Area.

Putnam County overview:
Name:	Putnam County
FIPS code:	17-155
State:	Illinois
Founded:	1825
Named for:	Israel Putnam
Seat:	Hennepin
Total Area:	172 sq mi (450 km²)
Land Area:	160 sq mi (400 km²)
Total Population:	6,006
Population Density:	35/sq mi (13/km²)
Time zone:	UTC−6 (Central)
Summer Time Zone (DST):	UTC−5 (CDT)
Website:	www.co.putnam.il.us

Putnam County location map. Where is Putnam County?

Putnam County location on the U.S. Map. Where is Putnam County. — Location of Putnam County in the the United States.

Putnam County location on the Illinois map. Where is Putnam County. — Location of Putnam County in Illinois.

Putnam County Road Map

Putnam CountyStreet Map. — Street map of Putnam County, Illinois. Source: OpenStreetMap (OSM)

Putnam CountyMap — Putnam Countypolitical map.

Geography

According to the U.S. Census Bureau, the county has a total area of 172 square miles (450 km), of which 160 square miles (410 km) is land and 12 square miles (31 km) (7.0%) is water. It is the smallest county in Illinois by area.

Climate and weather

In recent years, average temperatures in the county seat of Hennepin have ranged from a low of 13 °F (−11 °C) in January to a high of 86 °F (30 °C) in July, although a record low of −30 °F (−34 °C) was recorded in January 1999 and a record high of 104 °F (40 °C) was recorded in June 1988. Average monthly precipitation ranged from 1.14 inches (29 mm) in January to 4.32 inches (110 mm) in August.