The IGS Library at UC Berkeley has an extensive collection of budgets and financial reports, planning documents, and ordinance codes from cities and counties across California. This site provides links.
Formerly titled the California Planners Book of Lists. From the Governor's Office of Planning & Research, it and the companion ,Annual Planning Survey Results includes the status of local general and topical plans.
Sacramento Area Council of Governments. Includes Davis, Yolo County, Sacramento and surrounding communities. SACOG provides demographic data, Mapping data, transportation planning and more regional planning for the areas covered.