Collinsfield, South AustraliaCollinsfield is a locality in the Port Pirie Regional Council in the Mid North of South Australia, Australia.DemographicsAs of the 2021 Australian census, 6 people resided in Collinsfield, as well as in the. The median age of persons in Collinsfield was 57 years. There were more males than females, with 62.5% of the population male and 37.5% female. The average household size was 0 people per household.