Opening hours of Post Office in Mypolonga, South Australia Opening hours of Post Office in Mypolonga, South Australia Home / South Australia / Mypolonga / Post Office Post Office Australia Post 39 William Street, Mypolonga, South Australia 5254 +61 8 8535 4091 Post Office Australia Post 39 Williams St, Mypolonga SA 5254, Mypolonga, South Australia 5254 (08) 8535 4091 Categories of local businesses in Mypolonga Church Construction & Contractors Establishment Finance Food Food & Drink Gas Station Livestock breeder Organisations & Government Place of Worship Post Office School Shopping & Services Sports & Recreations