Homes For Sale, Rocklin Rocklin is a city in Placer County, California located approximately 22 miles from Sacramento, California, and about 6.1 miles northeast of Roseville in the Sacramento metropolitan area. Besides Roseville, it shares borders with Granite Bay, Loomis and Lincoln. As of the 2010 census, Rocklin's population was 56,974. Sorry we are experiencing system issues. Please try again.