Commercial vacancy rates in the fourth quarter of 2020 were above the national average across the Shannonside region.
Every county in Ulster, Munster, and Connacht had an increase in vacant commercial properties during the pandemic.
GeoDirectory says the national average was 13.5%, up 0.2 on the same period in 2019.
In the Shannonside region, Leitrim's vacancy rate up 0.7% to 17.3% - Carrick-on-Shannon had a commercial vacancy rate of 17.6%.
Longford experienced a similar increase, up 0.6 to 15.5%.
Of the towns in Longford sampled, Edgeworthstown (26.9%) had the highest commercial vacancy rate, while Longford (23.2%) had the lowest.
Meanwhile, the commercial vacancy rate in Roscommon increased by 0.3%, to 16.6%.
Of the towns in Roscommon sampled, Roscommon (20.7%) had the highest commercial vacancy rate, while Boyle (19.7%) had the lowest.
Sligo has the highest vacancy rate in the country, with almost one-in-five (19.9%) commercial properties vacant within the county.
Dara Keogh, the CEO of GeoDirectory, says "it's been an extremely turbulent twelve months for commercial sectors in Ireland", which may "point to the changing face of retail, with businesses moving towards an online model".
