Maine Population By County in 2021 (ACS-5Yrs)

Based on the US Census ACS-5Yrs estimates, in 2021, the total population of Maine was 1.36M. Among all Maine counties, Cumberland was the most populated county (300.78K), followed by York (210.49K), and then Penobscot (152.21K).

On the other hand, the least populated counties were: Piscataquis (16.76K), Franklin (29.49K), and Washington (31.00K).

The chart and table below shows the population of each county and the percentage of Maine population in each county.

You can see similar information for other states and by state for the United States.