Piatt County, Illinois facts for kids
Quick facts for kids
Piatt County
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Piatt County Courthouse in Monticello
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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 | 1841 |
| Named for | James A. Piatt |
| Seat | Monticello |
| Largest city | Monticello |
| Area | |
| • Total | 439 sq mi (1,140 km2) |
| • Land | 439 sq mi (1,140 km2) |
| • Water | 0.3 sq mi (0.8 km2) 0.06% |
| Population
(2020)
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| • Total | 16,673 |
| • Density | 37.98/sq mi (14.664/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional districts | 13th, 15th |
Piatt County is a county in Illinois. According to the 2020 United States Census, it had a population of 16,673. Its county seat is Monticello.
Piatt County is part of the Champaign–Urbana, IL Metropolitan Statistical Area.
Contents
History
The first settler was George Haworth, a Quaker, followed by James Martin, Abraham Hanline, Solomon Carter and William Cordell.
Piatt County was formed in 1841 from Macon and DeWitt counties. Two local residents, James A. Piatt and Jesse Warner, were instrumental in forming the county. It was named after James A. Piatt after winning a coin flip against Jesse Warner.
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Piatt County at the time of its creation in 1841
Abraham Lincoln practiced law in Piatt County as a circuit lawyer. Lincoln and Stephen A. Douglas planned their presidential debates in Piatt County in 1858, one of which is ornamented by a marker just south of Monticello.
The first courthouse was built in 1843. It was replaced by the current courthouse in 1904.
Geography
According to the US Census Bureau, the county has a total area of 439 square miles (1,140 km2), of which 439 square miles (1,140 km2) is land and 0.3 square miles (0.78 km2) (0.06%) is water.
Climate and weather
| Weather chart for Monticello, Illinois | |||||||||||||||||||||||||||||||||||||||||||||||
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| J | F | M | A | M | J | J | A | S | O | N | D | ||||||||||||||||||||||||||||||||||||
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1.6
32
14
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1.7
37
19
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3
49
30
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3.4
62
40
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4
73
51
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4
83
60
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3.8
85
64
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4
84
62
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2.9
78
54
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2.6
66
42
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2.9
49
31
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2.4
36
21
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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 Monticello have ranged from a low of 14 °F (−10 °C) in January to a high of 85 °F (29 °C) in July, although a record low of −25 °F (−32 °C) was recorded in January 1999 and a record high of 105 °F (41 °C) was recorded in July 1966. Average monthly precipitation ranged from 1.61 inches (41 mm) in January to 3.99 inches (101 mm) in August.
Major highways
Interstate 72
Interstate 74
U.S. Route 36
U.S. Route 150
Illinois Route 10
Illinois Route 32
Illinois Route 48
Illinois Route 105
Adjacent counties
- McLean County - north
- Champaign County - east
- Douglas County - southeast
- Moultrie County - south
- Macon County - southwest
- De Witt County - west
Demographics
| Historical population | |||
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| Census | Pop. | %± | |
| 1850 | 1,606 | — | |
| 1860 | 6,127 | 281.5% | |
| 1870 | 10,953 | 78.8% | |
| 1880 | 15,583 | 42.3% | |
| 1890 | 17,062 | 9.5% | |
| 1900 | 17,706 | 3.8% | |
| 1910 | 16,376 | −7.5% | |
| 1920 | 15,714 | −4.0% | |
| 1930 | 15,588 | −0.8% | |
| 1940 | 14,659 | −6.0% | |
| 1950 | 13,970 | −4.7% | |
| 1960 | 14,960 | 7.1% | |
| 1970 | 15,509 | 3.7% | |
| 1980 | 16,581 | 6.9% | |
| 1990 | 15,548 | −6.2% | |
| 2000 | 16,365 | 5.3% | |
| 2010 | 16,729 | 2.2% | |
| 2020 | 16,673 | −0.3% | |
| 2023 (est.) | 16,714 | −0.1% | |
| US Decennial Census 1790-1960 1900-1990 1990-2000 2010-2013 |
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As of the 2010 United States Census, there were 16,729 people, 6,782 households, and 4,823 families residing in the county. The population density was 38.1 inhabitants per square mile (14.7/km2). There were 7,269 housing units at an average density of 16.6 per square mile (6.4/km2). The racial makeup of the county was 98.0% white, 0.3% black or African American, 0.3% Asian, 0.2% American Indian, 0.2% from other races, and 0.9% from two or more races. Those of Hispanic or Latino origin made up 1.0% of the population. In terms of ancestry, 26.1% were German, 21.9% were American, 15.2% were English, and 13.4% were Irish.
Of the 6,782 households, 32.0% had children under the age of 18 living with them, 59.4% were married couples living together, 8.0% had a female householder with no husband present, 28.9% were non-families, and 24.5% of all households were made up of individuals. The average household size was 2.46 and the average family size was 2.92. The median age was 42.6 years.
The median income for a household in the county was $55,752 and the median income for a family was $65,850. Males had a median income of $50,425 versus $32,304 for females. The per capita income for the county was $26,492. About 5.1% of families and 7.6% of the population were below the poverty line, including 10.8% of those under age 18 and 4.5% of those age 65 or over.
Communities
City
- Monticello (seat)
Villages
Census-designated places
Other unincorporated communities
Former places
Townships
- Bement
- Blue Ridge
- Cerro Gordo
- Goose Creek
- Monticello
- Sangamon
- Unity
- Willow Branch
See also
In Spanish: Condado de Piatt para niños
