http://ift.tt/2iEGxC8 Olympian Hills in Hercules CA 94547 - For Olympian Hills information call Eduardo Ledesma at 510-799-6388 or visit http://ift.tt/1Lx7UWn. Best Realtor in Olympian Hills. Olympian Hills is one of the most desirable areas in Contra Costa County. Olympian Hills is located in Contra Costa County in the 94547 ZIP Code. Conveniently located near the I-80 Freeway & public transit.