O'Fallon
URL: https://knowledge.ivjn.us/en/places/mo-o-fallon.html

O'Fallon is a city in St. Charles County, Missouri, United States, with a population of about 85,040.

## Overview

O'Fallon is a city in [St. Charles County](https://knowledge.ivjn.us/en/places/mo-st-charles-county.html), [Missouri](https://knowledge.ivjn.us/en/places/missouri.html), United States, with a population of about 85,040[^geonames].

## Geography

- Coordinates: 38.8106, -90.6998

Updated: 2026-10-30

Relations:
- Located in: St. Charles County https://knowledge.ivjn.us/en/places/mo-st-charles-county.html

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