After being incorporated in 1958, Ontario became a heavy manufacturing center because of the Erie Railroad line, and its proximity to Mansfield.However, its status in that regard began to decline in the late 20th century, when much of the Erie Railroad that once ran through the city was abandoned; and shifts in the manufacturing industry led to the relocation or repositioning of many factories.The city is also a major regional retail hub serving the entire North-Central Ohio area, with a shopping population of over 150,000.[8] In 1960, the new Ontario High School was built, complete with an indoor swimming pool, a theatre, 3 shops, and numerous high-tech classrooms and labs for college-preparatory studies.[9] Several annexations have been made to Ontario since its incorporation and millions of dollars have been spent on public infrastructure including streets, water and sewer facilities, parks, schools, and new civic buildings for Administrative offices, Public Safety Departments and the Water Department.It leads west from the Norfolk Southern Railway in Mansfield to what used to be the General Motors metal stamping plant in Ontario.[16] Ontario is located on a major east-west transportation corridor that was originally known in the early 1900s as "Ohio Market Route 3."This route was chosen in 1913 to become part of the historic Lincoln Highway which was the first road across America, connecting New York City to San Francisco.[17][18] In 2005, the newly upgraded section of U.S. Route 30, a four-lane limited access highway between Bucyrus and Ontario open to traffic.[20] The Richland County Transit (RCT) operates local bus service five days a week, except for Saturdays and Sundays.