Smithlea is a rural locality in the Goondiwindi Region, Queensland, Australia.

[2] It is on the Queensland border with New South Wales.

[3] In the 2021 census, Smithlea had a population of 41 people.

[3] In the 2016 census, Smithlea had a population of 47 people.

[4] In the 2021 census, Smithlea had a population of 41 people.