[3][4] In the area around the town are thousands of naturally occurring indentations in the ground called Coolamon Holes which fill with water.

The original land where Coolamon now stands, prior to European settlement, was occupied by the Wiradjuri Aboriginal peoples.

Cowabbie Post Office opened on 1 May 1881 and was renamed Ganmain on 1 July and Coolamon on 1 November of that year.

who shortly before addressing a meeting in the Odd Fellow's hall received a telegram from the Prime Minister Joseph Cook advising him that the UK Government had declared war on Germany.

He announced to the meeting that Australia would support Britain "to the last man and the last shilling" a line that he would repeat frequently throughout the war, but which was first used in Coolamon.

[7] The town's broad main street, which has been restored, retains much of its old world charm with its wrought-iron verandahs and awnings.

[14] The most popular sport in Coolamon is Australian rules football, as it lies on the Canola Way, a geographical pocket stretching from the Grong Grong and Marrar, in which Australian football retains a strong following in the rugby league supporting state of New South Wales.