Major ancestry groups reported by Ayer residents include:

Report changes???

· 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%