File:California's 42nd Congressional District (since 2023) (new Version).svg
Shapefiles from:
- the United States Census Bureau, *the California State Geoportal
- San Francisco GIS
- City of Los Angeles Hub
- SANDAG/SanGIS Regional GIS Data Warehouse Open Data Portal
- the United States Forest Service
- the National Park Service
- the University of California, Berkeley Museum of Vertebrate Zoology via the Princeton University Library (licensed under CC BY 3.0)