Census data provides information about the region's demographic, economic, housing and social characteristics. This data is collected through regular surveys conducted by the US Census Bureau; typically through the Decennial Census, conducted every ten years, or through the American Community Survey (ACS), which happens annually.
The regional housing need allocation (RHNA) is a state required process that determines the number of housing units cities and counties must plan for in the Housing Element of their General Plan. This process currently takes place every five years in Shasta County and is conducted between the cities, Shasta County and the California Department of Housing and Community Development.