Fall River Mills (or Fall City) is an unincorporated town and census-designated place (CDP) in Shasta County, California, United States. The population was 573 as of the 2010 census.
The community is known for its agriculture. Being home to the production of cattle, Fall River Wild Rice, Garlic, Mint, Hay, Lavender and Alfalfa.
Fall River Mills was first occupied by the Native Americans of the Achomawi (Pit River) Tribe. Although the Fall River valley had been known to settlers for a number of years, no attempt was made toward its settlement until 1855. In that year two men, by the name of Mr Bowles and Mr Rogers, came into the valley from Yreka, bringing with them teams of oxen and wagons loaded with mill machinery, which they unloaded at the upper falls of Fall River, and immediately went to work milling timbers in order to build the valley its first mill.