Massachusetts vs Connecticut population, 1990 to 2025

What the data shows

• Massachusetts: 6M in 1990, 7.2M in 2025. Its low point was 6M in 1992.
• Connecticut: 3.3M in 1990, 3.7M in 2025. Its low point was 3.3M in 1995.

About this chart

Massachusetts had the larger population in 2025: 7,154,084 versus 3,688,496 for Connecticut, a gap of 3,465,588. Over the full period from 1990, Massachusetts grew by 18.9%, while Connecticut grew by 12.1%. Massachusetts was ahead in 1990 and remained ahead at every annual observation in the displayed series. The comparison uses the same reference year for both states.

The Census series compares July 1 resident populations for Massachusetts and Connecticut. In 1990, their counts were 6,018,664 and 3,289,056, respectively. Estimates from different Census vintages are joined across decades, and revisions can affect the measured trend. These state totals include residents throughout each state rather than only its cities. They describe the scale and direction of population change but do not, on their own, separate births, deaths and migration.

The data

Source: U.S. Census Bureau population estimates, July 1 (vintages 1999, 2000–2010 intercensal, 2020 and 2025), people. Retrieved November 5, 2026. July 1 resident population estimates. Different Census vintages are joined across decades; revisions can affect comparisons.