About McHenry County
McHenry County is a city located in United States, in the Illinois region. According to the latest available data (2026), the population of McHenry County is approximately 310,229 residents, making it the #250 most populous city in United States.
Globally, McHenry County ranks #5,957 among the world's most populated cities.
McHenry County City Statistics
| City | McHenry County |
| Country |  United States |
| Population | 310,229 |
| Global Rank | #5,957 |
| Rank in United States | #250 of 867 cities |
| City Category | city |
| Region | Illinois |
| Latitude | 42.32 |
| Longitude | -88.45 |
| Data Year | 2026 |
Where is McHenry County Located?
McHenry County is located in United States, in the Illinois region, at coordinates 42.32° latitude and -88.45° longitude. Located in the mid-latitudes, McHenry County experiences distinct four-season weather patterns.
Nearby Cities
Other Cities in United States
Largest Cities in United States
| # | City | Population |
|---|---|---|
| 1 | Harris County | 4,731,145 |
| 2 | Los Angeles | 3,898,747 |
| 3 | San Diego County | 3,298,634 |
| 4 | Brooklyn | 2,736,074 |
| 5 | Miami-Dade County | 2,701,767 |
Frequently Asked Questions
What is the population of McHenry County?
The population of McHenry County is approximately 310,229 residents according to the latest available data (2026).
Where is McHenry County located?
McHenry County is located in United States at approximately 42.32° latitude and -88.45° longitude.
Is McHenry County one of the largest cities in United States?
With a population of 310,229, McHenry County is one of the notable urban areas in United States. It ranks #250 out of 867 cities in the country.
