What are the fastest-growing counties in Maine?
Androscoggin County is the fastest-growing county in Maine: its population grew 0.94% a year from 2020 to 2025, to 116,487 residents (Census PEP Vintage 2025). York County (0.94%) and Franklin County (0.91%) follow. Maine as a whole grew 0.73% a year to 1,414,874 residents.
Data as of 2026-09-23. Population, growth and migration: PEP Vintage 2025 · 2020–2025. Income migration: IRS SOI 2022–2023 (2-yr lag).
Top 10 counties in Maine by population growth, 2020 to 2025
| Rank | County | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Androscoggin County | 116,487 | 0.94% | +3,599 | +3,071 | +$18.7M |
| 2 | York County | 222,434 | 0.94% | +10,423 | +2,340 | +$152.3M |
| 3 | Franklin County | 30,824 | 0.91% | +2,113 | +129 | +$15.5M |
| 4 | Cumberland County | 317,222 | 0.88% | +5,425 | +9,657 | +$124.0M |
| 5 | Oxford County | 60,346 | 0.83% | +4,047 | +28 | +$23.8M |
| 6 | Lincoln County | 36,595 | 0.76% | +2,364 | +120 | +$16.6M |
| 7 | Penobscot County | 157,967 | 0.75% | +6,821 | +2,454 | +$11.6M |
| 8 | Piscataquis County | 17,409 | 0.70% | +1,374 | +44 | +$7.6M |
| 9 | Kennebec County | 129,067 | 0.69% | +5,532 | +1,299 | +$14.6M |
| 10 | Sagadahoc County | 37,979 | 0.67% | +1,602 | +372 | +$26.8M |
Where are people moving in Maine?
York County gained the most people from elsewhere in the United States: net domestic migration of +10,423 from 2020 to 2025 (Census PEP Vintage 2025). The table ranks every Maine place with 10,000 or more residents by that figure; the IRS column shows net adjusted gross income migration for 2022 to 2023.
| Rank | County | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | York County | 222,434 | 0.94% | +10,423 | +2,340 | +$152.3M |
| 2 | Penobscot County | 157,967 | 0.75% | +6,821 | +2,454 | +$11.6M |
| 3 | Kennebec County | 129,067 | 0.69% | +5,532 | +1,299 | +$14.6M |
| 4 | Cumberland County | 317,222 | 0.88% | +5,425 | +9,657 | +$124.0M |
| 5 | Oxford County | 60,346 | 0.83% | +4,047 | +28 | +$23.8M |
| 6 | Androscoggin County | 116,487 | 0.94% | +3,599 | +3,071 | +$18.7M |
| 7 | Hancock County | 57,171 | 0.59% | +2,516 | +715 | +$26.4M |
| 8 | Somerset County | 51,620 | 0.45% | +2,444 | +145 | +$17.4M |
| 9 | Lincoln County | 36,595 | 0.76% | +2,364 | +120 | +$16.6M |
| 10 | Franklin County | 30,824 | 0.91% | +2,113 | +129 | +$15.5M |
Go past the headline numbers
The interactive Demographics map layer and the full report for a single place are part of paid plans.
Get the Demographics Report for Androscoggin CountyFrequently asked questions
- What are the fastest-growing counties in Maine?
- By population growth from 2020 to 2025, the fastest are Androscoggin County (0.94% a year), York County (0.94% a year), Franklin County (0.91% a year), Cumberland County (0.88% a year) and Oxford County (0.83% a year) (Census PEP Vintage 2025). Only places with 10,000 or more residents are ranked.
- Where are people moving in Maine?
- By net domestic migration from 2020 to 2025, the largest gains are York County (+10,423), Penobscot County (+6,821) and Kennebec County (+5,532) (Census PEP Vintage 2025).
- How fast is Maine growing overall?
- Maine grew 0.73% a year from 2020 to 2025, to 1,414,874 residents, with net migration of +76,060 people (Census PEP Vintage 2025).
- Where does this Maine data come from, and how current is it?
- Population, growth and migration come from the U.S. Census Bureau Population Estimates Program (PEP Vintage 2025 · 2020–2025). Income migration comes from IRS Statistics of Income (IRS SOI 2022–2023 (2-yr lag)). Counties with fewer than 10,000 residents are not ranked. Data last loaded 2026-09-23.
Data as of 2026-09-23: sources and periods
- Population, growth and migration
- U.S. Census Bureau, Population Estimates Program: PEP Vintage 2025 · 2020–2025. census.gov/programs-surveys/popest
- Income migration (net AGI)
- Internal Revenue Service, Statistics of Income migration data: IRS SOI 2022–2023 (2-yr lag). irs.gov/statistics/soi-tax-stats-migration-data
How to read the table
- Population is the Census July 1 estimate of the latest vintage.
- Growth is the compound annual rate over 2020 to 2025.
- Net domestic and international migration are cumulative people over 2020 to 2025.
- IRS net AGI migration is adjusted gross income that moved in, less what moved out, for 2022 to 2023. A plus sign means a net inflow.
- Places with fewer than 10,000 residents are left out of the rankings.