[3] Mullingar is wedge-shaped, with its northern boundary an east-west line approximately 10 kilometres (6.2 mi) north of the Kalgoorlie town centre.

In 1897, one of its residents had a home of a high enough standard to host Henry Charles Richards, a visiting British MP.

[6][7] In 1934, a reporter for Perth's Daily News noted that most of Mullingar's houses had survived the downturn of the 1920s, unlike in surrounding suburbs where many owners had dismantled them.

[8] The Kalgoorlie Speedway has been located in Mullingar since 1992, situated on the Goldfields Highway approximately 3.5 kilometres (2.2 mi) north of the residential area.

[10] The Australian Prospectors & Miners' Hall of Fame was located on the Hannans North site from 2001 to 2011, when it closed due to financial difficulties.