Mallard (also, Mallard Siding) is a former settlement in Alameda County, California. It was located on the Southern Pacific Railroad 1 mile (1.6 km) east-southeast of the present downtown Fremont, at an elevation of 52 feet (16 m). Mallard is also the name of a former ferry slip of the Sacramento Northern Railway (SN), located along the Sacramento-San Joaquin Delta shoreline of Contra Costa County, California, at West Pittsburg (now considered part of unincorporated Bay Point).