Princeton is a city in Mille Lacs and Sherburne counties in the U.S. state of Minnesota. It is located at the confluence of the Rum River and its West branch. The population was 4,698 at the 2010 census. A majority of residents live within Mille Lacs County.
U.S. Route 169 and Minnesota State Highway 95 are two of the main arterial routes in the city.
According to the United States Census Bureau, the city has a total area of 4.4 square miles (11.5 km²), of which, 4.4 square miles (11.5 km²) of it is land and 0.23% is water.