|LGA(s)||Moreton Bay Region|
|State electorate(s)||Glass House|
It was named after Stephen Simpson, the Queensland commissioner of lands, who used the area as a camp site in the mid-19th century. Although the normal rules of English grammar would suggest that the locality name should be spelled with a possessive apostrophe, the official titles of place names in Queensland do not include that particular punctuation.
The eastern border is marked by the Stanley River. Peachester State Forest occupies the eastern half of Commissioners Flat.
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