Waterloo
URL: https://knowledge.ivjn.us/en/places/il-waterloo.html

Waterloo is a city in Monroe County, Illinois, United States.

**Waterloo** is a city in [Illinois](https://knowledge.ivjn.us/en/places/illinois.html), United States, located in [Monroe County](https://knowledge.ivjn.us/en/places/il-monroe-county.html)[^geonames].

Updated: 2026-11-01

Relations:
- Located in: Monroe County https://knowledge.ivjn.us/en/places/il-monroe-county.html

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