Roseville (formerly, Roseville Junction,[6] Junction,[8] and Grider's[8]) is the largest city in Placer CountyCaliforniaUnited States, located in the Sacramento metropolitan area. As of January 1, 2015 the State Department of Finance estimated the City's population to be 128,382.[9] Interstate 80 runs through Roseville and State Route 65 runs through part of the northern edge of the City.