Backoo was a town of roughly 50 people, and was one of the more prominent communities in the township. The post office was established September 26, 1887, and was in continuous operation for more than 100 years, closing October 11, 1988. The post office was assigned the
ZIP code of 58215. Mail service is now handled through Cavalier.
John Mountain, one of its first settlers, is reported to have named the town after the
Barcoo River in his home country of
Australia. Other sources credit the origin of the name to
Baku, a city in
Azerbaijan on the
Caspian Sea. ==References==