Bailieborough or Bailieboro (Irish: Coill an Chollaigh) is a medium-sized town in the townland of Tanderagee, County Cavan, Ireland. Bailieborough is a thriving town in co cavan and is also experiencing a large population increase, its population now stands at 3,908+ which makes it the second largest town in Cavan. Bailieborough's proximity to the M3 motorway has made it a commuter town.It stands at the meeting-point of regional roads R165, R191, and R178.