Population of Williamstown, Massachusetts as of April 2026. How many people live in Williamstown today?

The exact population of Williamstown, Massachusetts as of April 2026 is estimated at 7,385 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 Williamstown.

Check out more data on population in Massachusetts:

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• Population of Taunton
• Population of Methuen
• Population of Attleboro
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