Home Postcodes by state VIC 3965 Postcode 3965 3965 is the postcode for Port Welshpool, VIC. Localities with postcode 3965Port WelshpoolVIC Postcode 3965 State or territory Victoria (VIC) Localities 1 Council area South Gippsland Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3964 · Postcode 3966