Monroe County URL: https://knowledge.ivjn.us/en/places/il-monroe-county.html Monroe County is a county of Illinois, United States. ## Overview Monroe County is a county of [Illinois](https://knowledge.ivjn.us/en/places/illinois.html), United States (FIPS il133), with a population of about 32,957[^geonames]. ## Geography - Coordinates: 38.2786, -90.1774 - Time zone: America/Chicago Updated: 2026-10-29 Relations: - Located in: Illinois https://knowledge.ivjn.us/en/places/illinois.html - Contains places: Columbia https://knowledge.ivjn.us/en/places/il-columbia.html - Contains places: Fults https://knowledge.ivjn.us/en/places/il-fults.html - Contains places: Hecker https://knowledge.ivjn.us/en/places/il-hecker.html - Contains places: Maeystown https://knowledge.ivjn.us/en/places/il-maeystown.html - Contains places: Valmeyer https://knowledge.ivjn.us/en/places/il-valmeyer.html - Contains places: Waterloo https://knowledge.ivjn.us/en/places/il-waterloo.html Mentioned in: - Columbia https://knowledge.ivjn.us/en/places/il-columbia.html - Fults https://knowledge.ivjn.us/en/places/il-fults.html - Hecker https://knowledge.ivjn.us/en/places/il-hecker.html - Maeystown https://knowledge.ivjn.us/en/places/il-maeystown.html - Valmeyer https://knowledge.ivjn.us/en/places/il-valmeyer.html - Waterloo https://knowledge.ivjn.us/en/places/il-waterloo.html Sources: - GeoNames US dataset (US.txt / admin2Codes.txt) https://download.geonames.org/export/dump/US.zip