The federal census for 1970 gave Tippecanoe County a population of 109,400 (Lafayette 44,995; West Lafayette 19,157).
West Lafayette built and opened a new City Hall and Police Department headquarters on West Navajo Drive, and dedicated it June 6, 1971. The structure succeeded a combination fire station and city hall in use since 1917 on North Street at Northwestern Avenue. That building became a fire station only.
Jack Mollenkopf resigned as Purdue University head football coach. Assistant Bob DeMoss took over the job next day.
Moon-landing astronaut hero Neil Armstrong returned to Purdue University to receive an honorary degree at winter commencement.
Authorities designated the original location of Ft. Ouiatenon a historical site for listing in the National Register of Historic Places.
Anti-war sentiment continued to surface on the Purdue University campus, and when "Chicago Seven" defendant Rennie Davis spoke to a Peace Movement audience in Elliott Hall of Music he draped his podium with an enemy (Viet Cong) flag.
Purdue National Bank hosted open house for its 10-story building at Second and Main streets.
Anti-war students at Purdue demonstrated against an ROTC awards ceremony in the Armory. About 100 scuffled with police, and on May 18 Purdue suspended about 30 students.
Greater Lafayette Transit Company, in business since 1939, announced that due to dwindling business it would discontinue local bus service after July 3.
Lafayette attorney Arthur L. Freyman Jr., a former deputy prosecutor, was sentenced to a year in prison for theft from a client's bank account.
Astronaut Eugene A. Cernan, Purdue University graduate, lunar module pilot in the Apollo 10 moon exploration flight, received an honorary engineering degree at commencement.
Purdue University's centennial celebration ended with sealing of a time capsule in the base of a marker on Executive Mall. Enrollment at West Lafayette was a record 25,582.
Dedication took place on grounds northwest of the Tippecanoe County Fairgrounds for the Lafayette YMCA's new building.
Republicans carried most Tippecanoe County races. But the county gave a plurality to Democrat Philip Sprague of Michigan City, who lost the 2nd District congressional race to incumbent Rep. Earl Landgrebe.
Fire damaged seven of the 20 rooms in "Earlhurst," the historic home of Adams Earl and his heirs. Contractor John E. Smith owned the 111-year-old home and grounds at the northwest corner of 21st and Union streets.
Governor Edgar D. Whitcomb presided over ceremonies opening Interstate Highway 65 from Indiana 25 northeast of Lafayette northwest to U.S. 24.
Capt. David H. Duart, West Lafayette, was listed as a prisoner of war held by North Vietnam.