What is the population of Montgomery County?

The population of Montgomery County, IL is 28,045.

Where is Montgomery County located?

Montgomery County, IL is located at latitude 39.2310400 and longitude -89.4788700. It is in United States.

What is the area of Montgomery County?

The area of Montgomery County, IL is 1838 km².

What is the elevation of Montgomery County?

Montgomery County, IL has an elevation of 195 meters (640 feet) above sea level.

What time zone is Montgomery County in?

Montgomery County, IL is in the America/Chicago time zone.

How has the population of Montgomery County changed?

The population of Montgomery County, IL has decreased from 30,104 (2010) to 28,045 (2020), a change of -6.8%.

Montgomery County, Illinois

Montgomery County: county in Illinois, United States.

About

Montgomery County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 30,104 and a population density of 16 people per km². After 10 years in 2020 county had an estimated population of 28,045 inhabitants. Its county seat is Hillsboro. The county was created 205 years ago in 1820.

Montgomery County locator map — Location of Montgomery County on Illinois map.

County Snapshot

Montgomery County at a glance

Montgomery County currently has 3 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.

Browse county places

Mapped populated places

These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.

Illinois counties

102

Open related pages

Largest city

Litchfield

Population 6,609

Quick Facts about Montgomery County

Population	28,045 (2020)
Country	United States of America
State	Illinois (United States)
Different from	Montgomery, Montgomery County, Montgomery County, Montgomery County, Montgomery County, Montgomery County, Montgomery County, Montgomery County, Montgomery County, Montgomery County, Montgomery County, Montgomery County, Montgomery County, Montgomery County, Montgomery County, Montgomery County, Montgomery County, Montgomery County
Area	1838 km²
Water as percent of area	0.8%
Land as percent of area	99.2%
Latitude & Longitude	39.2310,-89.4789
Named for	Richard Montgomery
Capital	Hillsboro
Establishment	January 01, 1821
Time Zone	America/Chicago
Local time	07:48:25 (23rd September 2026)
Density	15 Pop. per km² as of 2020
Population growth	-6.84% (2010-2020)
Weather	73℉ Mostly Sunny 7-days weather

Montgomery County Courthouse Hillsboro image

Geography

Montgomery County is located at 39°13'52"N 89°28'44"W (39.2310400, -89.4788700). It has 6 neighbors: Bond County, Christian County, Fayette County, Macoupin County, Sangamon County and Shelby County.

Montgomery County map

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The largest city of Montgomery County is Litchfield with a population of 6,609. Other cities include, Hillsboro population 5,909 and Nokomis population 2,077. See all Montgomery County cities & populated places.

Montgomery County Populated Places

Cities, towns, neighborhoods & other populated places in Montgomery County.

City Name	Population	Title
Litchfield	6,609	City in Illinois, United States
Hillsboro	5,909	City in Illinois, United States
Nokomis	2,077	City in Illinois, United States

Weather

73°F

Mostly Sunny

5 to 8 mph N Wednesday

Mostly sunny, with a high near 73.

7-Day Forecast

Official website of Montgomery County

Official Website

Montgomery County has 6 neighbours.

Bond County county in Illinois, United States.
Christian County county in Illinois, United States.
Fayette County county in Illinois, United States.
Macoupin County county in Illinois, United States.
Sangamon County county in Illinois, United States.
Shelby County county in Illinois, United States.

Demographics

According to census records, the population of Montgomery County decreased by 6.84% in 10 years.

Year	Population	% Change	Method
2010	30,104	-	census
2011	29,864	-0.8%	estimation process
2012	29,616	-0.83%	estimation process
2013	29,362	-0.86%	estimation process
2014	29,449	0.3%	estimation process
2015	29,192	-0.87%	estimation process
2016	29,061	-0.45%	estimation process
2017	28,781	-0.96%	estimation process
2018	28,691	-0.31%	estimation process
2019	28,414	-0.97%	estimation process
2020	28,045	-1.3%	estimation process

Comitatul Montgomery, Comte de Montgomery, Comté de Montgomery, Condado de Montgomery, Condado han Montgomery, Contea di Montgomery, Hrabstwo Montgomery, Montgomeri, Montgomeri srjan, Montgomery, Montgomery Comitatus, Montgomery Kun, Montgomery Kūn, Montgomery konderria, Montgomery megye, Montgomuri, Okrug Montgomeri, Quan Montgomery, Quận Montgomery, mantagomeri ka'unti, meng ge ma li xian, mongomeri jun, mqatʿt mwntghwmry, shhrstan mwntgmry aylynwy, Монтгомери, Монтгомері, Монтгомъри, Округ Монтгомери, Մոնտգոմերի շրջան, شهرستان مونتگمری، ایلینوی, مقاطعة مونتغومري, مونٹگمری کاؤنٹی، الینوائے, مونٹگومری کاؤنٹیع الینوۓ, মন্টগোমেরী কাউন্টি, モンゴメリー郡, 蒙哥馬利縣

Other places with the same name (17)

Montgomery County, Maryland county in Maryland, United States. with a population of 1,051,816 people.
Montgomery County, Pennsylvania county in Pennsylvania, United States. with a population of 833,869 people.
Montgomery County, Texas county in Texas, United States. with a population of 626,351 people.
Montgomery County, Ohio county in Ohio, United States. with a population of 531,610 people.
Montgomery County, Alabama county in Alabama, United States. with a population of 224,639 people.
Montgomery County, Tennessee county in Tennessee, United States. with a population of 214,251 people.
Montgomery County, Virginia county in Virginia, United States. with a population of 98,391 people.
Montgomery County, New York county in New York, United States. with a population of 49,170 people.
Montgomery County, Indiana county in Indiana, United States. with a population of 38,365 people.
Montgomery County, Kansas county in Kansas, United States. with a population of 31,502 people.
Montgomery County, Kentucky county in Kentucky, United States. with a population of 28,186 people.
Montgomery County, North Carolina county in North Carolina, United States. with a population of 27,238 people.
Montgomery County, Missouri county in Missouri, United States. with a population of 11,294 people.
Montgomery County, Iowa county in Iowa, United States. with a population of 9,935 people.
Montgomery County, Mississippi county in Mississippi, United States. with a population of 9,661 people.
Montgomery County, Georgia county in Georgia, United States. with a population of 9,012 people.
Montgomery County, Arkansas county in Arkansas, United States. with a population of 9,006 people.

Illinois Other Counties (more counties)

County Name	Population	Title
Cook County	5,108,284	County in Illinois, United States
Chicago	2,677,643	The third most populous city in the United States and the center of the Chicago metropolitan area.
DuPage County	917,481	County in Illinois, United States
Lake County	693,593	County in Oregon, United States
Will County	688,726	County in Illinois, United States
Kane County	531,010	County in southern Utah, United States
McHenry County	305,888	County in Illinois, United States
Winnebago County	281,295	County in Illinois, United States
Madison County	262,635	County in Montana, United States
Saint Clair County	258,046	The County of St.
Champaign County	209,192	County in Illinois, United States
Aurora	196,383	The second most populous city in Illinois.
Sangamon County	193,882	County in Illinois, United States
Peoria County	177,652	County in Illinois, United States of America
McLean County	171,256	County in North Dakota, United States
Naperville	147,986	The second most populous city in Illinois.