Cities Countries Rankings Compare Map Metrics

/

A modern, open atlas of statistics for every country and 33,000+ cities. Built on free authoritative data.

Explore

Cities
Countries
Interactive map
Rankings
Compare places

Data

All metrics
Data sources
Methodology
Public API

Topics

Digital nomads
UK in depth
UK house prices
UK crime
Cost of living

About

About STATLAS
Privacy
Terms

© 2026 STATLAS. Data under CC BY 4.0 from World Bank, GeoNames, Open-Meteo & others.

Indices labeled “modeled” are computed estimates — see methodology.

CitiesO'FallonPopulation

Population in O'Fallon

United States · O'Fallon profile

Population

29,002

people

World rank

#19854

of 33750

Percentile

41%

higher is better

Data quality

Measured

Total resident population.

Source: GeoNames · source data.

See full ranking About this metric O'Fallon profile

FAQ

Frequently asked

What is the population in O'Fallon?

O'Fallon has a population of 29,002 people. Total resident population.

How does O'Fallon rank for population?

O'Fallon ranks #19854 of 33750 cities for population (higher is better).