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Montgomery County, Illinois
Map of Illinois highlighting Montgomery County
Location in the state of Illinois
Map of the U.S. highlighting Illinois
Illinois's location in the U.S.
Founded 1821
Seat Hillsboro
Largest city Litchfield
 - Total
 - Land
 - Water

710 sq mi (1,838 km²)
704 sq mi (1,823 km²)
6 sq mi (15 km²), 0.84%
 - (2000)
 - Density

44/sq mi (17/km²)
Time zone Central: UTC-6/-5

Montgomery County is a county located in the U.S. state of Illinois. As of 2000, the population was 30,652. Its county seat is Hillsboro6.


Montgomery County was formed in 1821 out of Bond and Madison Counties. It was named in honor of Richard Montgomery, an American Revolutionary War general killed in 1775 while attempting to capture Quebec City, Canada.[1] Perrin's 1882 History of Montgomery County relates that the County was named in honor of Gen. Montgomery, but goes on to say that "others are dubious as to whence it received its name."


According to the U.S. Census Bureau, the county has a total area of 1,838 km² (710 sq mi). 1,823 km² (704 sq mi) of it is land and 15 km² (6 sq mi) of it (0.84%) is water.

Adjacent Counties[]


Historical populations
Census Pop.
1900 30,836
1910 35,311 14.5%
1920 41,403 17.3%
1930 35,278 −14.8%
1940 34,499 −2.2%
1950 32,460 −5.9%
1960 31,244 −3.7%
1970 30,260 −3.1%
1980 31,686 4.7%
1990 30,728 −3.0%
2000 30,652 −0.2%
IL Counties 1900-1990

As of the census² of 2000, there were 30,652 people, 11,507 households, and 7,928 families residing in the county. The population density was 17/km² (44/sq mi). There were 12,525 housing units at an average density of 7/km² (18/sq mi). The racial makeup of the county was 94.88% White, 3.73% Black or African American, 0.21% Native American, 0.23% Asian, 0.03% Pacific Islander, 0.47% from other races, and 0.46% from two or more races. 1.06% of the population were Hispanic or Latino of any race.

There were 11,507 households out of which 31.90% had children under the age of 18 living with them, 56.10% were married couples living together, 8.90% had a female householder with no husband present, and 31.10% were non-families. 27.80% of all households were made up of individuals and 14.70% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.97.

In the county the population was spread out with 23.70% under the age of 18, 8.30% from 18 to 24, 29.30% from 25 to 44, 21.70% from 45 to 64, and 17.00% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 106.40 males. For every 100 females age 18 and over, there were 106.40 males.

The median income for a household in the county was $33,123, and the median income for a family was $39,923. Males had a median income of $30,657 versus $20,563 for females. The per capita income for the county was $16,272. About 10.60% of families and 13.40% of the population were below the poverty line, including 18.40% of those under age 18 and 11.00% of those age 65 or over.

Cities and towns[]

Census designated places[]

External references[]

  • History of Montgomery County, Illinois, Perrin, 1882

Coordinates: 39°14′N 89°29′W / 39.23, -89.48


  1. ^ Allan H. Keith, Historical Stories: About Greenville and Bond County, IL. Consulted on August 15, 2007.

This page uses content from the English language Wikipedia. The original content was at Montgomery County, Illinois. The list of authors can be seen in the page history. As with this Familypedia wiki, the content of Wikipedia is available under the Creative Commons License.