The City of Richmond Hill started out as a small settlement located partially in the township of Vaughan and partially in the township of Markham. The City's development was closely linked with the development of Yonge Street, which was planned primarily as a military road by John Graves Simcoe, the first Lieutenant-Governor of the Province of Upper Canada.
The City was officially incorporated on June 18, 1872, as a village and the first Council Meeting was held on January 1, 1873, under the leadership of Abraham Law as Reeve. Richmond Hill developed because of its proximity to Toronto, as farmers came into City on their way to Toronto markets and people traveled up and down Yonge Street to and from communities further north.
Early in the twentieth century, several large greenhouse operations were built in Richmond Hill, while rose growing turned the City into the "rose capital" of Canada. In the 1920s, the village council adopted the motto of the Duke of Richmond, for whom the City may have been named. A local artist and carriage painter, William Ashford Wright, created a City crest that included elements of the Duke of Richmond's coat of arms and roses.
Data from the recent census conducted by Statistics Canada indicated that Richmond Hill continues to be one of Canada's fastest-growing municipalities. The City's population exceeded 200,000 in 2014.
In March 2019, Richmond Hill Council voted to rename the "Town of Richmond Hill" to the "City of Richmond Hill." The name change influences how the municipality sees itself and how others perceive it.
Over the years, Richmond Hill has remained a distinctive community, one of change yet with strong historical roots. Even during this time of most extensive growth to-date, Richmond Hill has remained a community with a friendly, down-to-earth flavor. That is why the City's unofficial motto is "A little north, a little nicer."