Home Postcodes by state VIC 3198 Postcode 3198 3198 is the postcode for 2 localities in VIC: Belvedere Park and Seaford. Localities with postcode 3198Belvedere ParkVICSeafordVIC Postcode 3198 State or territory Victoria (VIC) Localities 2 Council area Frankston Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3197 · Postcode 3199