McHenry County
URL: https://knowledge.ivjn.us/en/places/il-mchenry-county.html

McHenry County is a county of Illinois, United States.

## Overview

McHenry County is a county of [Illinois](https://knowledge.ivjn.us/en/places/illinois.html), United States (FIPS il111), with a population of about 308,760[^geonames].

## Geography

- Coordinates: 42.3244, -88.4524
- Time zone: America/Chicago

Updated: 2026-10-29

Relations:
- Located in: Illinois https://knowledge.ivjn.us/en/places/illinois.html
- Contains places: Algonquin https://knowledge.ivjn.us/en/places/il-algonquin.html
- Contains places: Big Foot Prairie https://knowledge.ivjn.us/en/places/il-big-foot-prairie.html
- Contains places: Bull Valley https://knowledge.ivjn.us/en/places/il-bull-valley.html
- Contains places: Cary https://knowledge.ivjn.us/en/places/il-cary.html
- Contains places: Chemung https://knowledge.ivjn.us/en/places/il-chemung.html
- Contains places: Crystal Lake https://knowledge.ivjn.us/en/places/il-crystal-lake.html
- Contains places: Fox River Grove https://knowledge.ivjn.us/en/places/il-fox-river-grove.html
- Contains places: Harvard https://knowledge.ivjn.us/en/places/il-harvard.html
- Contains places: Greenwood https://knowledge.ivjn.us/en/places/il-greenwood.html
- Contains places: Hebron https://knowledge.ivjn.us/en/places/il-hebron.html

Mentioned in:
- Algonquin https://knowledge.ivjn.us/en/places/il-algonquin.html
- Big Foot Prairie https://knowledge.ivjn.us/en/places/il-big-foot-prairie.html
- Bull Valley https://knowledge.ivjn.us/en/places/il-bull-valley.html
- Cary https://knowledge.ivjn.us/en/places/il-cary.html
- Chemung https://knowledge.ivjn.us/en/places/il-chemung.html
- Crystal Lake https://knowledge.ivjn.us/en/places/il-crystal-lake.html
- Fox River Grove https://knowledge.ivjn.us/en/places/il-fox-river-grove.html
- Greenwood https://knowledge.ivjn.us/en/places/il-greenwood.html
- Harvard https://knowledge.ivjn.us/en/places/il-harvard.html
- Hebron https://knowledge.ivjn.us/en/places/il-hebron.html

Sources:
- GeoNames US dataset (US.txt / admin2Codes.txt) https://download.geonames.org/export/dump/US.zip