Theres a few.
Radio North - 846KHz If I remember correctly comreg has visited them multiple times and are fine with them due to them being on MW and their programming being mainly religious and country music
Radio Star Country - 981KHz

There was also an Energy AM around 1300-1400KHz that broadcasted periodically from around Wicklow I think. The frequency changed once or twice and there was a Facebook page for them aswell.

Aswell as the rest listed on the bandscan.