The Mintaro Post Office was built in 1883, although the township has had a postal service from 1866. The simple sandstone and brick building was built to a standard design repeated in many country towns. The sandstone is tuck pointed with black lining and red brick curved plinths are used.
The Post Office Building is listed as a State Heritage Place on the State Heritage Register. It passed from The Commonwealth into private ownership in 1930 when it was sold to Frank McNamara for £4100.
The McNamara’s continued to operate the postal agency until 1979 when it was sold to Stephen and Marilyn Geier. Since then, the building and postal agency has changed hands on four occasions. Various additions to the building were added over these years but recent conservation work has seen these removed.
The postal agency continues to operate as the town’s distribution centre for letters and parcels, now for one hour a day, Monday to Friday. Banking agencies and other services are no longer provided.