Airth is a Royal Burgh, village, former trading port and civil parish in Falkirk, Scotland. It is 6 miles north of Falkirk town and sits on the banks of the River Forth. Airth lies on the A905 road between Grangemouth and Stirling and is overlooked by Airth Castle; the village retains two market crosses and a small number of historic houses. At the time of the 200…Airth is a Royal Burgh, village, former trading port and civil parish in Falkirk, Scotland. It is 6 miles north of Falkirk town and sits on the banks of the River Forth. Airth lies on the A905 road between Grangemouth and Stirling and is overlooked by Airth Castle; the village retains two market crosses and a small number of historic houses. At the time of the 2001 census the village had a population of 1,273 residents but this has been revised to 1,660 according to a 2008 estimate.