I have a feeling that Brandenton is actually Bradenton, which is the county seat of Manatee County, FL.You might have better results posting in that county's forum. You might try a look up with Bradenton, Manatee Co., Fl as the place of death and see if that brings better results.
Here is what a SSDI search found using Bradenton as the death location.
Social Security Death Index Record about Harold Hanson Name: Harold Hanson SSN: 470-01-9330 Last Residence: 33581Sarasota, Sarasota, Florida, United States of America Born: 18 Nov 1895 Died: Oct 1973 State (Year) SSN issued: Minnesota (Before 1951 )
Sarasota County is the neighboring county to the south of Bradenton and I know from living there for 25 years that it would not be unusual for a Manatee Co Resident to use Sarasot County Medical Facilities, actually it is quite the norm as in many cases people are much close to Sarasota amenities than to Bradenton.Both Sarasota and Manatee Counties have very active genealogy societies who are happy to help any one who asks.