10 Most Populated ZIP Codes in Maine

The top ZIP code for population in Maine is 04401 (Hampden, Penobscot County), with a population of 44,418. Across the top 10 most populated ZIP codes in Maine, population ranges from 44,418 to 22,081, covering communities from Hampden to Scarborough.

Rank	ZIP	City	County	Population	Population
1	04401	Hampden	Penobscot County	44,418	44,418
2	04240	Lewiston	Androscoggin County	37,886	37,886
3	04103	Portland	Cumberland County	31,705	31,705
4	04901	Waterville	Kennebec County	27,431	27,431
5	04106	Scarborough	Cumberland County	26,966	26,966
6	04330	Augusta	Kennebec County	26,517	26,517
7	04005	Biddeford	York County	24,698	24,698
8	04210	Auburn	Androscoggin County	24,294	24,294
9	04074	Scarborough	Cumberland County	22,527	22,527
10	04011	Brunswick	Cumberland County	22,081	22,081

Methodology

Rankings are derived from the U.S. Census Bureau American Community Survey 5-Year Estimates, vintage 2019 to 2023, joined to USPS ZIP Code Tabulation Areas. We rank by population and surface the top 10 ZIP codes within Maine. Values reflect ZCTA-level estimates and may differ slightly from city-level figures. Compiled and reviewed by the Zip Code Near Me Data Team.

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Reviewed by Zip Code Near Me Data Team. Last verified June 13, 2026.

10 Most Populated ZIP Codes in Maine

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