This list is from research done in 2024 that is based on people born abroad and does not include first generation, American-born children.

• 1850: 3% (33) of the population (995) were immigrants from Ireland and England.
• 1860: 7.4% (79) of the population (1059) were immigrants from Ireland, England and Nova Scotia.
• 1870: 10.8% (107) of the population (987) were immigrants from Ireland, England, Russia, Germany, Denmark, Prussia, and Canada.
• 1880: 12.8% (135) of the population (1057) were immigrants from Germany, Ireland, England, Prussia, Sweden, France, Austria, and Scotland. One person – Maria Rebecca Cook Miller – was born on March 15, 1852 to Scottish immigrant parents James Cook (1804-1877) and Rebecca Middleton (1816-1897) on the boat in the middle of the Atlantic Ocean.
• 1900: 22% (287) of the population (1302) were immigrants from Germany, England, Sweden, French Canada), Italy, Bohemia, Poland (Russia), Hungary, France, and Austria.
• 1910: 27% (361) of the population (1337) were immigrants from Italy, one from English Africa (Joseph Friedland), Germany, England, Sweden, French Canada, Bohemia, Hungary, France, Austria, Switzerland, Slovakia and increased specificity in country of origin (Russian Poland, Yiddish Poland, English Canadian).
• 1920: 27.8% (427) of the population (1534) were immigrants. All the countries above were attested along with new countries including Galatia, Ukraine, Holland, Minsk, Lithuania, Russian Jew, Finland. It should also be recognized that, during this decade, an increased number of people from out of state were relocating to Avon.
• 1930: 23.9% (415) of the population (1738) were immigrants.
• 1940: 10.9% (245) of the population (2258) were immigrants that included people from Poland, Hungary, Germany, Ireland, Italy, England, and one from Brazil.