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Major ancestry groups reported by Ayer residents include:

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Irish - 19%
English - 11%
French (except Basque) - 10%
Italian - 10%
German - 6%
Black or African American - 6%
French Canadian - 5%
Scottish - 4%
Polish - 3%
Scotch-Irish - 3%
Puerto Rican - 2%
Portuguese - 2%
Canadian - 1%
Korean - 1%
Norwegian - 1%
Other Hispanic or Latino - 1%
Sub-Saharan African - 1%
Swedish - 1%
Russian - 1%
Central American: - 1%
Mexican - 1%
Cape Verdean - 1%
Dutch - 1%
Chinese, except Taiwanese - 1%
American Indian tribes, specified - 1%
Asian Indian - 1%