CalCOFI's website and subdomains are managed by the CalCOFI Technical Group at Scripps Institution of Oceanography. Data, information, and general content are generated by the CalCOFI partner organizations: Integrative Oceanography Division at Scripps Institution of Oceanography; Southwest Fisheries Science Center, NOAA; California Department of Fish & Wildlife, Marine Region; Long-Term Ecological Research Network, CCE-LTER; and affiliates.

CalCOFI's web server runs on an agency-independent commercial web hosting service running an open source content management system.

calcofi.com, main website has been online since 1994, originally hosted by ucsd.edu. The previous version of calcofi.com at old.calcofi.com is retired.

Current developmental sites: