Fastest Growing Counties in Maine (2025)

County
Rank
Change (2020) ↓
2025 Pop.
2020 Pop.
Franklin County16.2%31,29429,468
Piscataquis County25.02%17,65216,808
Oxford County35.01%60,79957,898
Lincoln County44.79%36,95135,263
York County54.52%221,858212,260
Waldo County64.27%41,35039,658
Androscoggin County73.3%114,845111,175
Kennebec County83.2%128,707124,712
Cumberland County93.11%313,016303,585
Sagadahoc County102.89%37,79536,732
Penobscot County112.83%156,480152,169
Somerset County122.37%51,67050,473
Hancock County131.75%56,48055,511
Washington County141.68%31,61131,088
Aroostook County150.52%67,40967,063
Knox County16-0.2%40,57340,654

Maine County Growth Overview

Maine's counties show varied growth patterns from 2020 to 2025. Franklin County leads with 6.2% annualized growth, followed by Piscataquis County (5.02%) and Oxford County (5.01%). The largest counties are Cumberland County (313,016), York County (221,858), and Penobscot County (156,480). Of the 16 counties in Maine, 15 are growing while just 1 has experienced population decline. Overall, counties averaged 3.2% annualized growth, with total population growing by 3.22% annually.