Putnam County, Illinois facts for kids
Quick facts for kids
Putnam County
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Putnam County Courthouse, Hennepin
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Location within the U.S. state of Illinois
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 Illinois's location within the U.S. |
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| Country |  United States |
| State |  Illinois |
| Founded | 1825 |
| Named for | Israel Putnam |
| Seat | Hennepin |
| Largest village | Granville |
| Area | |
| • Total | 172 sq mi (450 km2) |
| • Land | 160 sq mi (400 km2) |
| • Water | 12 sq mi (30 km2) 7.0% |
| Population
(2020)
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| • Total | 5,637 |
| • Estimate
(2023)
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5,561  |
| • Density | 32.77/sq mi (12.65/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional districts | 14th, 16th |
Putnam County is the least extensive county in the U.S. state of Illinois. According to the 2020 census, it had a population of 5,637. 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.
Contents
Geography
According to the U.S. Census Bureau, the county has a total area of 172 square miles (450 km2), of which 160 square miles (410 km2) is land and 12 square miles (31 km2) (7.0%) is water. It is the smallest county in Illinois by area.
Climate and weather
| Weather chart for Hennepin, Illinois | |||||||||||||||||||||||||||||||||||||||||||||||
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| J | F | M | A | M | J | J | A | S | O | N | D | ||||||||||||||||||||||||||||||||||||
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1.1
30
13
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1.2
36
19
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2.2
48
29
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3.2
62
39
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3.6
73
50
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4.2
83
59
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3.8
86
64
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4.3
84
62
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3.6
77
53
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2.7
65
41
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2.5
49
31
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2
36
19
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| temperatures in °F precipitation totals in inches source: The Weather Channel |
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Metric conversion
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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.
Major highways
Interstate 180
Illinois Route 18
Illinois Route 26
Illinois Route 29
Illinois Route 71
Illinois Route 89
Adjacent counties
- Bureau County (northwest)
- LaSalle County (east)
- Marshall County (south)
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Putnam County at the time of its creation in 1825
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The county split in two portions, 1827-1831
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Putnam County between 1831 and 1837
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Putnam between 1837 and 1839
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Putnam in 1839, reduced to its present borders
Demographics
| Historical population | |||
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| Census | Pop. | %± | |
| 1840 | 2,131 | — | |
| 1850 | 3,924 | 84.1% | |
| 1860 | 5,587 | 42.4% | |
| 1870 | 6,280 | 12.4% | |
| 1880 | 5,554 | −11.6% | |
| 1890 | 4,730 | −14.8% | |
| 1900 | 4,746 | 0.3% | |
| 1910 | 7,561 | 59.3% | |
| 1920 | 7,579 | 0.2% | |
| 1930 | 5,235 | −30.9% | |
| 1940 | 5,289 | 1.0% | |
| 1950 | 4,746 | −10.3% | |
| 1960 | 4,570 | −3.7% | |
| 1970 | 5,007 | 9.6% | |
| 1980 | 6,085 | 21.5% | |
| 1990 | 5,730 | −5.8% | |
| 2000 | 6,086 | 6.2% | |
| 2010 | 6,006 | −1.3% | |
| 2020 | 5,637 | −6.1% | |
| 2023 (est.) | 5,561 | −7.4% | |
| U.S. Decennial Census 1790-1960 1900-1990 1990-2000 2010 |
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As of the 2010 census, there were 6,006 people, 2,509 households, and 1,734 families residing in the county. The population density was 37.5 inhabitants per square mile (14.5/km2). There were 3,074 housing units at an average density of 19.2 per square mile (7.4/km2). The racial makeup of the county was 96.6% white, 0.5% black or African American, 0.2% Asian, 0.1% American Indian, 1.4% from other races, and 1.1% from two or more races. Those of Hispanic or Latino origin made up 4.2% of the population. In terms of ancestry, 46.5% were German, 16.7% were Irish, 16.3% were Italian, 10.9% were Polish, 10.1% were English, 5.1% were Swedish, and 3.5% were American.
Of the 2,509 households, 27.7% had children under the age of 18 living with them, 57.6% were married couples living together, 7.2% had a female householder with no husband present, 30.9% were non-families, and 26.0% of all households were made up of individuals. The average household size was 2.39 and the average family size was 2.85. The median age was 45.2 years.
The median income for a household in the county was $56,458 and the median income for a family was $68,875. Males had a median income of $50,205 versus $31,886 for females. The per capita income for the county was $27,004. About 6.2% of families and 10.9% of the population were below the poverty line, including 21.8% of those under age 18 and 5.4% of those age 65 or over.
Communities
Villages
Unincorporated communities
- Florid
- Moronts
- Mount Palatine (partially in LaSalle)
- Putnam
- Walnut Grove
Townships
Putnam County is divided into four townships:
- Granville
- Hennepin
- Magnolia
- Senachwine
See also
In Spanish: Condado de Putnam (Illinois) para niños
