Creator
- Placer County Geographic Information Systems33
- California. Division of Mines and Geology32
- University of Chicago Library32
- United States. Department of Commerce31
- United States. National Ocean Service31
- Ritchie, Andrew C.30
- Hartwell, Stephen R.29
- MarinMap29
- Smith, Walter H. F.29
- Wessel, Paul29
- Erdey, Mercedes D.27
- Manson, Michael W.27
- United States. Bureau of the Census. Geography Division27
- California. Department of Conservation26
- Endris, Charles A.26
- Bretz, Carrie K.25
- County of Marin23
- Alameda County Registrar of Voters 22
- City of Hayward22
- Department of Conservation & Development, Contra Costa County22