Myrniong was named for the murrnong plant, the local indigenous word for yam daisy, a popular food source. European settlement began in around 1850 with local farmers producing wheat for hungry gold miners at nearby Blackwood. Later production concentrated on beef and dairy.
The Post Office opened on 6 September 1858 as Pentland Hills, was renamed Myrniong in 1872 and closed in 1970.[3]