Piatt County, Illinois | |
|---|---|
 Piatt County Courthouse in Monticello | |
 Location within the U.S. state ofIllinois | |
 Illinois's location within theU.S. | |
| Coordinates:40°01′N88°35′W / 40.01°N 88.59°W /40.01; -88.59 | |
| Country |  United States |
| State |  Illinois |
| Founded | 1841 |
| Named after | 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 (0.78 km2) 0.06% |
| Population (2020) | |
• Total | 16,673 |
• Estimate (2024) | 16,628 [1] |
| • Density | 38.0/sq mi (14.7/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional districts | 13th,15th |
| Website | www |
Piatt County is acounty inIllinois. According to the2020 United States census, it had a population of 16,673.[2] Itscounty seat isMonticello.[3]
Piatt County is part of theChampaign-Urbana Metropolitan Area.
The first settler was George Haworth, aQuaker, followed by James Martin, Abraham Hanline, Solomon Carter and William Cordell.
Piatt County was formed in 1841 fromMacon andDeWitt 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.
Abraham Lincoln practiced law in Piatt County as a circuit lawyer. Lincoln andStephen 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.
According to theUS 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.[4]
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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.[5]
| Census | Pop. | Note | %± |
|---|---|---|---|
| 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% | |
| 2024 (est.) | 16,628 | [6] | −0.3% |
| US Decennial Census[7] 1790-1960[8] 1900-1990[9] 1990-2000[10] 2010-2013[2] | |||
| Race / Ethnicity(NH = Non-Hispanic) | Pop 1980[11] | Pop 1990[12] | Pop 2000[13] | Pop 2010[14] | Pop 2020[15] | % 1980 | % 1990 | % 2000 | % 2010 | % 2020 |
|---|---|---|---|---|---|---|---|---|---|---|
| White alone (NH) | 16,469 | 15,478 | 16,090 | 16,276 | 15,600 | 99.32% | 99.55% | 98.32% | 97.29% | 93.56% |
| Black or African American alone (NH) | 13 | 8 | 39 | 56 | 83 | 0.08% | 0.05% | 0.24% | 0.33% | 0.50% |
| Native American orAlaska Native alone (NH) | 13 | 16 | 12 | 28 | 23 | 0.08% | 0.10% | 0.07% | 0.17% | 0.14% |
| Asian alone (NH) | 20 | 11 | 20 | 49 | 80 | 0.12% | 0.07% | 0.12% | 0.29% | 0.48% |
| Native Hawaiian orPacific Islander alone (NH) | x[16] | x[17] | 2 | 6 | 1 | x | x | 0.01% | 0.04% | 0.01% |
| Other race alone (NH) | 2 | 0 | 10 | 12 | 51 | 0.01% | 0.00% | 0.06% | 0.07% | 0.31% |
| Mixed race or Multiracial (NH) | x[18] | x[19] | 91 | 135 | 588 | x | x | 0.56% | 0.81% | 3.53% |
| Hispanic or Latino (any race) | 64 | 35 | 101 | 167 | 247 | 0.39% | 0.23% | 0.62% | 1.00% | 1.48% |
| Total | 16,581 | 15,548 | 16,365 | 16,729 | 16,673 | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% |
As of the2010 United States census, there were 16,729 people, 6,782 households, and 4,823 families residing in the county.[20] 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).[4] 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.[20] In terms of ancestry, 26.1% wereGerman, 21.9% wereAmerican, 15.2% wereEnglish, and 13.4% wereIrish.[21]
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.[20]
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 thepoverty line, including 10.8% of those under age 18 and 4.5% of those age 65 or over.[22]
| Year | Republican | Democratic | Third party(ies) | |||
|---|---|---|---|---|---|---|
| No. | % | No. | % | No. | % | |
| 1892 | 2,138 | 51.08% | 1,896 | 45.29% | 152 | 3.63% |
| 1896 | 2,579 | 56.07% | 1,958 | 42.57% | 63 | 1.37% |
| 1900 | 2,648 | 57.32% | 1,905 | 41.23% | 67 | 1.45% |
| 1904 | 2,515 | 63.24% | 1,334 | 33.54% | 128 | 3.22% |
| 1908 | 2,349 | 57.96% | 1,530 | 37.75% | 174 | 4.29% |
| 1912 | 1,150 | 30.71% | 1,417 | 37.84% | 1,178 | 31.46% |
| 1916 | 4,012 | 55.49% | 3,028 | 41.88% | 190 | 2.63% |
| 1920 | 4,283 | 68.16% | 1,903 | 30.28% | 98 | 1.56% |
| 1924 | 3,799 | 64.31% | 1,733 | 29.34% | 375 | 6.35% |
| 1928 | 4,565 | 69.62% | 1,959 | 29.88% | 33 | 0.50% |
| 1932 | 3,179 | 42.71% | 4,200 | 56.43% | 64 | 0.86% |
| 1936 | 3,931 | 48.77% | 4,084 | 50.66% | 46 | 0.57% |
| 1940 | 4,564 | 55.94% | 3,564 | 43.68% | 31 | 0.38% |
| 1944 | 3,912 | 59.38% | 2,641 | 40.09% | 35 | 0.53% |
| 1948 | 3,646 | 60.13% | 2,361 | 38.93% | 57 | 0.94% |
| 1952 | 4,701 | 67.82% | 2,220 | 32.03% | 11 | 0.16% |
| 1956 | 4,622 | 66.23% | 2,356 | 33.76% | 1 | 0.01% |
| 1960 | 4,506 | 60.90% | 2,889 | 39.05% | 4 | 0.05% |
| 1964 | 3,141 | 44.63% | 3,897 | 55.37% | 0 | 0.00% |
| 1968 | 3,973 | 56.28% | 2,447 | 34.66% | 639 | 9.05% |
| 1972 | 5,057 | 67.72% | 2,394 | 32.06% | 17 | 0.23% |
| 1976 | 4,442 | 55.39% | 3,509 | 43.75% | 69 | 0.86% |
| 1980 | 4,867 | 62.25% | 2,421 | 30.97% | 530 | 6.78% |
| 1984 | 5,000 | 63.46% | 2,840 | 36.05% | 39 | 0.49% |
| 1988 | 4,137 | 56.85% | 3,099 | 42.59% | 41 | 0.56% |
| 1992 | 3,076 | 36.42% | 3,520 | 41.67% | 1,851 | 21.91% |
| 1996 | 3,265 | 44.05% | 3,274 | 44.17% | 873 | 11.78% |
| 2000 | 4,619 | 55.09% | 3,488 | 41.60% | 278 | 3.32% |
| 2004 | 5,392 | 62.80% | 3,124 | 36.38% | 70 | 0.82% |
| 2008 | 4,991 | 55.34% | 3,859 | 42.79% | 168 | 1.86% |
| 2012 | 5,413 | 61.92% | 3,090 | 35.35% | 239 | 2.73% |
| 2016 | 5,634 | 62.19% | 2,645 | 29.19% | 781 | 8.62% |
| 2020 | 6,248 | 63.43% | 3,329 | 33.79% | 274 | 2.78% |
| 2024 | 6,104 | 63.94% | 3,204 | 33.56% | 238 | 2.49% |
Places adjacent to Piatt County, Illinois | ||||||||||||||||
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Municipalities and communities ofPiatt County, Illinois,United States | ||
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| Villages | ||
| Townships | ||
| CDPs | ||
| Other unincorporated communities | ||
| Footnotes | ‡This populated place also has portions in an adjacent county or counties | |
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