Fire Williamson, IA 50272 Phone : (641) 862-3311 Williamson Tavern 108 W South Ave Williamson, IA 50272 Phone : (641) 862-3615 Williamson City Hall Williamson, IA 50272 Phone : (641) 862-3311 Post Office - Williamson 103 W South Ave Williamson, IA 50272 Phone : (641) 862-3812 Williamson City Of--city Clerk Williamson, IA 50272 Phone : (641) 862-3311