NorthYork, was formed on June 13, 1922 out of the rural part of the Township of York. The rapidly-urbanizing parts of the Township remained in that township. As North York itself became more urbanized, it became the Borough of North York in 1967, and then on February 14, 1979, the City of North York. To commemorate receiving its city charter on St. Valentine's Day, the city's corporate slogan was "The City with Heart". It now forms the largest part of the area served by the "North York Community Council", a committee of Toronto City Council.

Originally, North York was known as a regional agricultural hub composed of scattered villages. The area boomed following World War II, and by the 1950s and 1960s, it resembled many other sprawling North American suburbs. Of note is the community of Don Mills.