Princeton is a city in western part of Green Lake County, Wisconsin, United States. The population was 1,267 at the 2020 census. The cit…Princeton is a city in western part of Green Lake County, Wisconsin, United States. The population was 1,267 at the 2020 census. The city is located within the Town of Princeton. The Fox River flows through the city, dividing the city into an east half and west half.