Is Boston growing?

How much Boston, MA has grown or shrunk since 2015, how that compares with the county, the state and the United States, and how the community's age is changing.

U.S. Census Bureau, American Community Survey 5-year estimates.

This story was assembled using AI and public data sources.

Boston looks different than it did in 2015.

Population change since 2015: +2.1% — 650,281 residents in 2015 → 663,972 in 2023

Boston population, 2015 to 2023

• 2015: 650281
• 2023: 663972

Growth since 2015

• Boston: 2.1
• Suffolk County: 3.1
• MA: 4.3
• U.S.: 5

Median age: 33.2 — U.S. median: 38.7

What it means

Boston is growing more slowly than the country — +2.1% here versus +5.0% nationally since 2015.

Residents here are younger than the country overall — the median resident is about 5.5 years younger than the U.S. median.

These are estimates, not a head count. ACS 5-year figures average responses collected over five years, so they show direction and scale rather than a single day's population.