Population Non-Hispanic American Indian % by Zip Code (ZCTA5) — Maine

NOTE: Gray indicates insufficient data or a suppressed estimate.

The highest concentrations of Non-Hispanic American Indian population in Maine are clustered in Washington County along the eastern border, where several zip codes reach 25–50%+ levels, corresponding to the Passamaquoddy tribal lands near Pleasant Point and Indian Township. A secondary cluster of moderately elevated percentages (5–15%) appears in Penobscot County, aligning with the Penobscot Indian Island Reservation near Old Town. The vast majority of the state, particularly the southern coastal and western interior regions, registers at or near 0%, underscoring how sharply concentrated Maine's Indigenous population remains around federally recognized reservation communities.

Data: U.S. Census Bureau, 2023 ACS

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