Princeton is an unincorporated community in Lancaster County, Nebraska, United States. Princeton was founded in 1886. It was likely named after Princeton, New Jersey. A post office was established in Princeton in 1886, and remained in operation until it was discontinued in 1959. Pat Rileys father was born here.Leon Francis Riley Sr. During a playing career t…Princeton is an unincorporated community in Lancaster County, Nebraska, United States. Princeton was founded in 1886. It was likely named after Princeton, New Jersey. A post office was established in Princeton in 1886, and remained in operation until it was discontinued in 1959. Pat Rileys father was born here.Leon Francis Riley Sr. During a playing career that stretched from 1927 to 1942 and 1944 to 1949, Riley appeared in 2,267 minor league games for 21 different teams, with a brief trial with the 1944 Philadelphia Phillies during the World War II manpower shortage. He was the father of Lee and Pat Riley.