Toowoomba is situated at a latitude and longitude of 27°33′S 151°57′E.
The city sits on the crest of the Great Dividing Range, around 700 metres above sea level. A few streets are on the eastern side of the edge of the range, but the majority of the city is west of the divide.
The City occupies the edge of the range and the low ridges behind it. Two valleys run north from the southern boundary, each arising from springs either side of Middle Ridge near Spring Street at an altitude of around 680m. These waterways, East Creek and West Creek flow together just north of the CBD to form Gowrie Creek.
Gowrie Creek drains to the west across the Darling Downs and is a tributary of the Condamine River, part of the Murray-Darling Basin. The water flowing down Gowrie Creek makes its way some 3000 km to the mouth of the Murray River near Adelaide in South Australia. Rain which falls on the easternmost streets of Toowoomba flows east to Moreton Bay a distance of around 170 km.
The postcode of Toowoomba is 4350. The postcode of the Toowoomba Mail Centre is 4352.
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