1972-1996: Member, Marin County Board of Supervisors
20 years: Member, Golden Gate Bridge, Highway and Transportation District (Board of Directors)
10 years: Member, California State Coastal Commissioner
- PLACENAME: The Gary Giacomini Open Space Preserve (including Gary Giacomini Ridge) is part of the Marin County Open Space District.
- TENURE: At the time of his retirement, Giacomini was the longest serving County Supervisor in California.