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
48416,986Rockland
48435,221Camden
48644,873Warren
48624,130Union
48563,636Rockport
48612,753Thomaston
48471,795Hope
45741,711Washington
48601,590Tenants Harbor
45631,464Cushing
48541,440Owls Head
48581,371South Thomaston
45471,145Friendship
4863981Vinalhaven
4859781Spruce Head
4853448North Haven
4855266Port Clyde
485195Matinicus
464543Isle Au Haut
showing: 19 rows

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