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. Nearly all residents live within Mille Lacs County. U.S. Route 169 and Minnesota State Highway 95 are two of the main routes in the city. According to the United States Census Bureau, the city has a total area of 5.18 square miles (13.42 km2); 4.96 square miles (12.85 km2) is land and 0.22 square miles (0.57 km2) is water.  The elevation is 981 ft (299 m) above sea level.

As of the census of 2010, there were 4,698 people, 1,926 households, and 1,176 families residing in the city. The population density was 947.2 inhabitants per square mile (365.7/km2). There were 2,044 housing units at an average density of 412.1 per square mile (159.1/km2). The racial makeup of the city was 96.5% White, 0.4% African American, 0.7% Native American, 0.3% Asian, 0.2% from other races, and 2.0% from two or more races. Hispanic or Latino of any race were 1.7% of the population.

There were 1,926 households of which 31.7% had children under the age of 18 living with them, 41.1% were married couples living together, 14.6% had a female householder with no husband present, 5.3% had a male householder with no wife present, and 38.9% were non-families. 32.3% of all households were made up of individuals and 16.2% had someone living alone who was 65 years of age or older. The average household size was 2.35 and the average family size was 2.92.

The median age in the city was 38.7 years. 24.5% of residents were under the age of 18; 8.5% were between the ages of 18 and 24; 24.9% were from 25 to 44; 22.7% were from 45 to 64; and 19.4% were 65 years of age or older. The gender makeup of the city was 46.7% male and 53.3% female (1).

Princeton, a city with Sherburne County and the county seat of Mille Lacs County until 1920 when Milaca was named, received its first permanent settlers in 1854 and was named in honor of John S. Prince of St. Paul, who with others platted this village in the fall or winter of 1855, the plat being recorded April 19, 1856. He was born in Cincinnati, Ohio, May 7, 1821; came to St. Paul in 1854 as agent of the Chouteau Fur Company; afterward engaged in insurance, real estate, and banking; was a member of the constitutional convention of Minnesota, 1857; mayor of St. Paul, 1860-62 and 1865-66; was president of the Savings Bank of St. Paul for many years; and died in that city September 4, 1895. Princeton Township was organized in 1857, and the village separated from the township and was incorporated March 3, 1877. Major industries were brickmaking and a potato starch factory; the village had a station of the Great Northern Railway in section 33, and its post office began in 1861 (2).

Sources:

(1) http://en.wikipedia.org/wiki/

(2) http://www.mnhs.org/