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Shelby County, Illinois

Coordinates: 39°23′N 88°49′W / 39.39°N 88.81°W / 39.39; -88.81
From Wikipedia, the free encyclopedia
For other uses, see Shelby County (disambiguation).

Shelby County
County
Shelby County Courthouse
Shelby County Courthouse
Map of Illinois highlighting Shelby County
Location within the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location within the U.S.
Coordinates: 39°23′N 88°49′W / 39.39°N 88.81°W / 39.39; -88.81
Country United States
State Illinois
Founded1827
Named afterIsaac Shelby
SeatShelbyville
Largest cityShelbyville
Area
 • Total
768 sq mi (1,990 km2)
 • Land759 sq mi (1,970 km2)
 • Water9.5 sq mi (25 km2)  1.2%
Population
 (2020)
 • Total
20,990
 • Estimate 
(2024)
20,542 Decrease[1]
 • Density27.7/sq mi (10.7/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district15th
Websitewww.shelbycounty-il.com

Shelby County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 20,990.[2] Its county seat is Shelbyville.[3]

History

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Shelby County was established in 1827 out of Fayette County. It was named in honor of Isaac Shelby, governor of Kentucky and participant in the American Revolutionary War.

  • Shelby county from the time of its creation to 1829, including a large tract of unorganized territory temporarily attached to it, whose precise border was not defined.[4]
    Shelby county from the time of its creation to 1829, including a large tract of unorganized territory temporarily attached to it, whose precise border was not defined.[4]
  • Shelby County between 1829 and 1839
    Shelby County between 1829 and 1839
  • Shelby County between 1839 and 1843
    Shelby County between 1839 and 1843
  • Shelby County in 1843, reduced to its present borders
    Shelby County in 1843, reduced to its present borders

Geography

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According to the U.S. Census Bureau, the county has a total area of 768 square miles (1,990 km2), of which 759 square miles (1,970 km2) is land and 9.5 square miles (25 km2) (1.2%) is water.[5]

Climate and weather

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Shelbyville, Illinois
Climate chart (explanation)
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█ Average max. and min. temperatures in °F
█ Precipitation totals in inches
Source: The Weather Channel[6]
Metric conversion
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█ Average max. and min. temperatures in °C
█ Precipitation totals in mm

In recent years, average temperatures in the county seat of Shelbyville have ranged from a low of 19 °F (−7 °C) in January to a high of 87 °F (31 °C) in July, although a record low of −26 °F (−32 °C) was recorded in January 1915 and a record high of 111 °F (44 °C) was recorded in July 1936. Average monthly precipitation ranged from 1.89 inches (48 mm) in February to 4.05 inches (103 mm) in June.[6]

Major highways

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Adjacent counties

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Demographics

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Historical population
CensusPop.Note%±
18302,972—
18406,659124.1%
18507,80717.2%
186014,61387.2%
187025,47674.3%
188030,27018.8%
189031,1913.0%
190032,1263.0%
191031,693−1.3%
192029,601−6.6%
193025,471−14.0%
194026,2903.2%
195024,434−7.1%
196023,404−4.2%
197022,589−3.5%
198023,9235.9%
199022,261−6.9%
200022,8932.8%
201022,363−2.3%
202020,990−6.1%
2023 (est.)20,568[7]−2.0%
U.S. Decennial Census[8]
1790-1960[9] 1900-1990[10]
1990-2000[11] 2010-2013[2]

2020 census

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Shelby County, Illinois – Racial and ethnic composition
Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.
Race / Ethnicity (NH = Non-Hispanic) Pop 1980[12] Pop 1990[13] Pop 2000[14] Pop 2010[15] Pop 2020[16] % 1980 % 1990 % 2000 % 2010 % 2020
White alone (NH) 23,715 22,152 22,581 21,922 20,116 99.13% 99.51% 98.64% 98.03% 95.84%
Black or African American alone (NH) 21 14 35 48 65 0.09% 0.06% 0.15% 0.21% 0.31%
Native American or Alaska Native alone (NH) 19 26 24 39 35 0.08% 0.12% 0.10% 0.17% 0.17%
Asian alone (NH) 39 22 46 56 83 0.16% 0.10% 0.20% 0.25% 0.40%
Native Hawaiian or Pacific Islander alone (NH) x [17] x [18] 0 5 1 x x 0.00% 0.02% 0.00%
Other race alone (NH) 16 2 5 4 40 0.07% 0.01% 0.02% 0.02% 0.19%
Mixed race or Multiracial (NH) x [19] x [20] 92 109 437 x x 0.40% 0.49% 2.08%
Hispanic or Latino (any race) 113 45 110 180 213 0.47% 0.20% 0.48% 0.80% 1.01%
Total 23,923 22,261 22,893 22,363 20,990 100.00% 100.00% 100.00% 100.00% 100.00%

2010 census

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As of the 2010 United States census, there were 22,363 people, 9,216 households, and 6,376 families living in the county.[21] The population density was 29.5 inhabitants per square mile (11.4/km2). There were 10,396 housing units at an average density of 13.7 per square mile (5.3/km2).[5] The racial makeup of the county was 98.6% white, 0.3% Asian, 0.2% American Indian, 0.2% black or African American, 0.2% from other races, and 0.6% from two or more races. Those of Hispanic or Latino origin made up 0.8% of the population.[21] In terms of ancestry, 25.5% were German, 9.9% were English, 9.8% were American, and 8.8% were Irish.[22]

Of the 9,216 households, 29.2% had children under the age of 18 living with them, 57.1% were married couples living together, 8.0% had a female householder with no husband present, 30.8% were non-families, and 27.1% of all households were made up of individuals. The average household size was 2.40 and the average family size was 2.90. The median age was 43.5 years.[21]

The median income for a household in the county was $44,627 and the median income for a family was $55,655. Males had a median income of $40,119 versus $27,860 for females. The per capita income for the county was $21,891. About 7.8% of families and 11.3% of the population were below the poverty line, including 16.7% of those under age 18 and 8.1% of those age 65 or over.[23]

Census-designated place

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The Census Bureau has defined one census-designated place (CDP) in Shelby County.

Government

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Townships

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Shelby County is divided into these townships:

Communities

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Cities

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Town

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Villages

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Census-designated place

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Other unincorporated communities

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Politics

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United States presidential election results for Shelby County, Illinois[24]
Year Republican Democratic Third party(ies)
No.  % No.  % No.  %
1892 2,304 32.45% 3,523 49.62% 1,273 17.93%
1896 3,071 38.75% 4,709 59.42% 145 1.83%
1900 3,365 41.38% 4,514 55.52% 252 3.10%
1904 3,220 46.53% 2,962 42.80% 738 10.66%
1908 3,312 42.30% 4,065 51.92% 453 5.79%
1912 1,431 20.77% 3,467 50.33% 1,991 28.90%
1916 5,911 42.61% 7,515 54.18% 445 3.21%
1920 6,351 53.93% 5,113 43.42% 312 2.65%
1924 5,605 48.13% 5,265 45.21% 776 6.66%
1928 7,214 62.58% 4,071 35.31% 243 2.11%
1932 4,657 35.91% 8,093 62.40% 219 1.69%
1936 5,795 40.81% 8,186 57.64% 220 1.55%
1940 7,250 47.71% 7,704 50.69% 243 1.60%
1944 6,201 50.65% 5,919 48.35% 123 1.00%
1948 5,282 47.89% 5,589 50.68% 158 1.43%
1952 7,189 57.65% 5,268 42.25% 12 0.10%
1956 7,075 56.94% 5,337 42.95% 13 0.10%
1960 6,872 54.53% 5,720 45.39% 11 0.09%
1964 4,281 37.66% 7,088 62.34% 0 0.00%
1968 5,487 49.27% 4,528 40.66% 1,122 10.07%
1972 7,217 62.08% 4,389 37.75% 20 0.17%
1976 5,234 45.54% 6,172 53.70% 87 0.76%
1980 6,441 59.12% 3,988 36.61% 465 4.27%
1984 6,372 59.38% 4,317 40.23% 41 0.38%
1988 5,370 53.28% 4,650 46.14% 58 0.58%
1992 3,631 32.49% 5,101 45.65% 2,443 21.86%
1996 4,215 43.06% 4,249 43.41% 1,324 13.53%
2000 5,851 57.57% 4,018 39.54% 294 2.89%
2004 6,753 63.85% 3,744 35.40% 80 0.76%
2008 6,396 58.67% 4,245 38.94% 261 2.39%
2012 6,843 65.55% 3,342 32.01% 254 2.43%
2016 8,229 74.48% 2,288 20.71% 532 4.81%
2020 9,426 77.80% 2,504 20.67% 185 1.53%
2024 9,267 79.18% 2,240 19.14% 196 1.67%

See also

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References

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Wikimedia Commons has media related to Shelby County, Illinois.
  1. ^ "County Population Totals and Components of Change: 2020–2024". United States Census Bureau. U.S. Department of Commerce. March 2025. Retrieved August 31, 2025.
  2. ^ a b "State & County QuickFacts". United States Census Bureau. Retrieved July 8, 2014.
  3. ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.
  4. ^ White, Jesse. Origin and Evolution of Illinois Counties. State of Illinois, March 2010. [1]
  5. ^ a b "Population, Housing Units, Area, and Density: 2010 - County". United States Census Bureau. Archived from the original on February 12, 2020. Retrieved July 12, 2015.
  6. ^ a b "Monthly Averages for Shelbyville, Illinois". The Weather Channel. Retrieved January 27, 2011.
  7. ^ "Annual Estimates of the Resident Population for Counties: April 1, 2020 to July 1, 2023". United States Census Bureau. Retrieved April 2, 2024.
  8. ^ "U.S. Decennial Census". United States Census Bureau. Retrieved July 8, 2014.
  9. ^ "Historical Census Browser". University of Virginia Library. Retrieved July 8, 2014.
  10. ^ "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved July 8, 2014.
  11. ^ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Retrieved July 8, 2014.
  12. ^ "1980 Census of Population - General Population Characteristics - Illinois- Table 14 - Persons by Race and Table 16 (p. 18-28) - Total Persons and Spanish Origin Persons by Type of Spanish Origin and Race (p. 29-39)" (PDF). United States Census Bureau.
  13. ^ "1990 Census of Population - General Population Characteristics - Illinois - Table 6 - Race and Hispanic Orogin" (PDF). United States Census Bureau.
  14. ^ "P004: Hispanic or Latino, and Not Hispanic or Latino by Race – 2000: DEC Summary File 1 – Shelby County, Illinois". United States Census Bureau.
  15. ^ "P2: Hispanic or Latino, and Not Hispanic or Latino by Race – 2010: DEC Redistricting Data (PL 94-171) – Shelby County, Illinois". United States Census Bureau.
  16. ^ "P2: Hispanic or Latino, and Not Hispanic or Latino by Race – 2020: DEC Redistricting Data (PL 94-171) – Shelby County, Illinois". United States Census Bureau.
  17. ^ included in the Asian category in the 1980 Census
  18. ^ included in the Asian category in the 1990 Census
  19. ^ not an option in the 1980 Census
  20. ^ not an option in the 1990 Census
  21. ^ a b c "DP-1 Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data". United States Census Bureau. Archived from the original on February 13, 2020. Retrieved July 12, 2015.
  22. ^ "DP02 SELECTED SOCIAL CHARACTERISTICS IN THE UNITED STATES – 2006-2010 American Community Survey 5-Year Estimates". United States Census Bureau. Archived from the original on February 13, 2020. Retrieved July 12, 2015.
  23. ^ "DP03 SELECTED ECONOMIC CHARACTERISTICS – 2006-2010 American Community Survey 5-Year Estimates". United States Census Bureau. Archived from the original on February 13, 2020. Retrieved July 12, 2015.
  24. ^ Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved November 12, 2018.

39°23′N 88°49′W / 39.39°N 88.81°W / 39.39; -88.81

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