Lewis Francis Byington was an American lawyer, author, and Democratic politician who served on the San Francisco Board of Supervisors (1898–1900) and as District Attorney of San Francisco (1900–1905).

Downieville is a census-designated place in and the county seat of Sierra County, California, United States. Downieville is on the North Fork of the Yuba River, at an elevation of 2,966 feet (904 m). The 2020 United States census reported Downieville's population was 290.