Population of Mountlake Terrace, Washington as of January 2026. How many people live in Mountlake Terrace today?

The exact population of Mountlake Terrace, Washington as of January 2026 is estimated at 21,286 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 Mountlake Terrace.

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