The state of Maine is divided into 16 counties. York County is the oldest (formed in 1652), while Knox County is the youngest (established in 1860).

Cumberland County is the most populous, with a population of 289,977 people. Aroostook County has the most land area (17,687 km2), while Sagadahoc County has the smallest (958 km2).

Please find a list of all Maine counties listed alphabetically below.

• Androscoggin County, ME
• Aroostock County, ME
• Cumberland County, ME
• Franklin County, ME
• Hancock County, ME
• Kennebec County, ME
• Knox County, ME
• Lincoln County, ME
• Oxford County, ME
• Penobscot County, ME
• Piscataquis County, ME
• Sagadahoc County, ME
• Somerset County, ME
• Waldo County, ME
• Washington County, ME
• York County, ME