McHenry County, Illinois
McHenry County: County in Illinois, United States
About
McHenry County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 308,760 and a population density of 198 people per km². After 10 years in 2020 county had an estimated population of 305,888 inhabitants. Its county seat is Woodstock. The county was created 189 years ago in 1835.
![McHenry County locator map](https://cdn.mapsof.net/images/490/4901666/mchenry-county-locator-map-image_138646.png)
Quick Facts about McHenry County
Population : | 305,888 (2020) |
Country : | United States of America |
State : | Illinois (United States) |
Different from : | McHenry County |
Area : | 1563 km2 |
Water as percent of area : | 1.3% |
Land as percent of area : | 98.7% |
Named for : | William McHenry |
Altitude : | 886 feet / 270 meters |
Capital : | Woodstock |
Establishment : | January 01, 1836 |
Time Zone : | America/Chicago |
Local time : | 2/17/2025 - 6:24:46 PM |
Density : | 196 Pop. per km² as of 2020 |
Population growth : | -0.94% (2010-2020) |
![WoodstockILCourtHJail image](https://cdn.mapsof.net/images/490/4901666/mchenry-county-image_2565.jpg)
![WoodstockILCourtHJail image](https://cdn.mapsof.net/images/490/4901666/mchenry-county-image_2565.jpg)
Geography
McHenry County is located at 42°19'28"N 88°27'9"W (42.3243900, -88.4524500). It has 5 neighbors: Boone County, Cook County, DeKalb County, Kenosha County and Walworth County.
McHenry County map
The largest city of McHenry County is Crystal Lake with a population of 39,642. Other cities include, McHenry population 27,100, Harvard population 8,979, Marengo population 7,377 and Lakemoor population 5,912. See all McHenry County cities & populated places.
McHenry County Populated Places (more)
Cities, towns, neighborhoods & other populated places in McHenry County.
City Name | Population | Title |
---|---|---|
Crystal Lake | 39,642 | City located in McHenry County, Illinois, USA |
Algonquin | 30,730 | Village in Illinois |
Lake in the Hills | 28,345 | Village in Illinois |
Huntley | 27,256 | Village in McHenry and Kane counties, Illinois, United States |
McHenry | 27,100 | City in Illinois |
Cary | 17,929 | Village in Illinois, United States |
Harvard | 8,979 | Private research university in Cambridge, Massachusetts, United States |
Chemung | 8,702 | Township in McHenry County, Illinois |
Marengo | 7,377 | City in McHenry County, Illinois, United States |
Johnsburg | 6,310 | Village in United States of America |
Lakemoor | 5,912 | City in Illinois, United States of America |
Spring Grove | 5,679 | City in Houston County, Minnesota, United States |
Fox River Grove | 4,518 | City in United States of America |
Lawrence | 4,380 | Township in Lawrence County, Illinois |
Wonder Lake | 3,837 | Human settlement in Illinois, United States of America |
Pistakee Highlands | 3,454 | Census designated place |
- Official Website
Official website of McHenry County
McHenry County has 5 neighbours.
- Boone County county in Illinois, United States
- Cook County county in Illinois, United States
- DeKalb County county in Illinois, United States
- Kenosha County county in Wisconsin, United States
- Walworth County county in Wisconsin, United States
Demographics
According to census records, the population of McHenry County decreased by 0.94% in 10 years.
Year | Population | % Change | Method |
2010 | 308,760 | - | census |
2011 | 308,504 | -0.08% | estimation process |
2012 | 308,230 | -0.09% | estimation process |
2013 | 307,605 | -0.2% | estimation process |
2014 | 307,404 | -0.07% | estimation process |
2015 | 307,572 | 0.05% | estimation process |
2016 | 307,159 | -0.13% | estimation process |
2017 | 307,815 | 0.21% | estimation process |
2018 | 308,251 | 0.14% | estimation process |
2019 | 307,774 | -0.15% | estimation process |
2020 | 305,888 | -0.62% | estimation process |
People born in McHenry County (3)
People born in McHenry County, including politician T. V. Eddy, politician M. F. Hatch, politician Frank H. Richards, .
List
Other places with the same name (2)
- McHenry County , North Dakota county in North Dakota, United States with a population of 5,695 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 |
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. |
Rockford | 144,835 | The second most populous city in Illinois. |