This is a 1.2 percent rise in Knox County’s population, from 40,609 in 2020 to 41,084 in 2021.
Knox County had the 10th largest population in Maine in 2021.
The US Census Bureau found more than 73 percent of counties in the US saw a natural decrease in population in 2021. This is up from a 55.5 percent increase in 2020.
The Midwest suffered the most sustained population decreases, with many counties along the US East Coast and through the Rocky Mountains seeing increases.
The US population continues to grow, though at a slower rate than before.
Maine Counties By Population Change from 2020 to 2021
| County | 2020 Estimated Population | 2021 Estimated Population | % Change in Population From Year to Year |
|---|---|---|---|
| Piscataquis County | 16,768 | 17,165 | 2.4% |
| Lincoln County | 35,192 | 35,828 | 1.8% |
| Oxford County | 57,849 | 58,629 | 1.3% |
| Hancock County | 55,460 | 56,192 | 1.3% |
| York County | 212,089 | 214,591 | 1.2% |
| Knox County | 40,609 | 41,084 | 1.2% |
| Sagadahoc County | 36,688 | 37,071 | 1% |
| Franklin County | 29,418 | 29,687 | 0.9% |
| Waldo County | 39,635 | 39,912 | 0.7% |
| Cumberland County | 303,312 | 305,231 | 0.6% |
| Kennebec County | 123,754 | 124,486 | 0.6% |
| Penobscot County | 152,007 | 152,765 | 0.5% |
| Somerset County | 50,404 | 50,592 | 0.4% |
| Washington County | 31,062 | 31,121 | 0.2% |
| Androscoggin County | 111,039 | 111,034 | 0% |
| Aroostook County | 66,994 | 66,859 | -0.2% |
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