New London is a city in Outagamie and Waupaca counties in the U.S. state of Wisconsin. Founded in 1851, the population was 7,348 at th…New London is a city in Outagamie and Waupaca counties in the U.S. state of Wisconsin. Founded in 1851, the population was 7,348 at the 2020 census. The city has an annual Saint Patrick's Day Parade, Irish Fest, and week-long festivities, when the city's name is changed to "New Dublin" for the week. In 2022, Killaloe, County Clare, Ireland became New London's sister city.