Rosedale is an unincorporated community and census-designated place in Baltimore County, Maryland, United States. The population was 19,257 at the 2010 United States Census.
The origin of the name Rosedale is not documented with certainty. However, a 1950 fourth grade class was told to interview family and friends about the history of the Rosedale community. From that activity came an explanation. A young Englishman had a farm on Hamilton Avenue just above Philadelphia Road. His farm had numerous roses. Since his name was Dale and the roses were so lovely, the townspeople settled on the name of Rosedale.
Rosedale, a community northeast of the city of Baltimore, was a plantation and later farming community, from the time of the first settlers and their slaves, until suburban development began after World War II. Maryland Route 7, which runs through the community, was originally the Philadelphia Road. George Washington traveled it to New York in 1789 where he was inaugurated as the first American president.
In the latter part of the nineteenth century, this area was settled by new waves of immigrants, mostly from Germany and Poland.