There are 19 zip codes in Knox County, Maine. The most populated is 4841, located in Rockland. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
048416,986Rockland
048435,221Camden
048644,873Warren
048624,130Union
048563,636Rockport
048612,753Thomaston
048471,795Hope
045741,711Washington
048601,590Tenants Harbor
045631,464Cushing
048541,440Owls Head
048581,371South Thomaston
045471,145Friendship
04863981Vinalhaven
04859781Spruce Head
04853448North Haven
04855266Port Clyde
0485195Matinicus
0464543Isle Au Haut

Zip Codes in Knox County, Maine by Population (2024)