Ballymahon Courthouse and Market House, is a three bay two storey commodious building and has recently been renovated into a new branch of Longford County Library as well as functioning as a one stop shop and community facility.
It is situated in the centre of the town standing impressively along the Main Street and was built in 1819. Inside, the old dock of the former courthouse has been lovingly restored and now plays hosts to performances of choirs and poetry readings more regularly, among other community and artistic related events.
Opposite St Catherine’s Church is the old RIC police barracks. It became a Garda barracks after independence in 1922 until the mid 1990’s when a new station was built on the other side of the river opposite the old mill. The barracks was attacked during the War of Independence on Thursday night 19th August 1920. The attack was led by Sean MacEoin, The Blacksmith of Ballinalee, Sean Connolly and Frank Davis. A small party of local volunteers also took part in the raid. Sean MacEoin later visited the barracks during an election campaign in the 1950s. Ruairi O Brádaigh was also held here in the 1950s during the ‘border campaign’ by the IRA.