Population of Lake St. Louis, Missouri as of February 2026. How many people live in Lake St. Louis today?

The exact population of Lake St. Louis, Missouri as of February 2026 is estimated at 16,707 residents. Please note: this figure is an estimate and may slightly change as people get born and pass away, it also depends on migration to/from Lake St. Louis.

Check out more data on population in Missouri:

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