Cavan and Monaghan towns are “Clean to European Norms”.
The latest Irish Business Against Litter survey shows litter levels have risen slightly across the country, with cities again faring badly.
Monaghan is ranked 12th, with Cavan just behind in 17th - and has regained "Clean" status.
Naas in Kildare is Ireland's cleanest town, while Dublin's North Inner City is a litter blackspot.
The report also highlights levels of PPE waste are at record levels, with an increase in the presence of masks and gloves
IBAL spokesperson, Conor Horgan says Naas spruced up very well compared to other urban areas: