A reel containing images of 2,000 State of California Birth Records from May through September of 1974 was found in a publicly accessible location . Names , Social Security numbers , addresses , and certain types of medical information were in the birth record images . People in Santa Clara , Santa Cruz , Shasta , Siskiyou , Solano , Sonoma , Stanislaus , Sutter , or Tehama counties and who were born or had a child born in 1974 between May and September were affected . ;