Sierra County Chamber of Commerce
- Includes lodging, businesses, dining, historic sites, museums, outdoor recreation, maps and calendar of events.
- http://sierracountychamber.net/

CERES Sierra County
- An index to environmental information for the county. Extensive reference includes road, weather, and flood conditions, demographics, historical resources, maps.
- http://ceres.ca.gov/geo_area/counties/Sierra/