There were no properties available to rent under the Housing Assistance Payment Scheme in Waterford City last month.
Nationally, just 41 places were listed as accepting the HAP scheme, which sees landlords receive a part rental payment from the State.
The Simon Communities Report shows 24 of those properties were in Dublin, with six in Dundalk, and 11 in Kildare.
Wayne Stanley of Simon Communities Ireland says the figures are worrying as the moratorium on rental evictions will cease at the end of March.
"If we can achieve things over the next 12 weeks: if we can see allocation increases to people in homelessness and we can see those numbers coming down...
"If we can see real action on the modular build, on vacancy, on dealing with dereliction in our towns and cities, and those brought into the public housing system, I think we'll be in a better space.
"If we're not [in a better space], and we're standing still, I would be really concerned about what's going to happen in April."
Meanwhile, housing expert and Assistant Professor of Social Policy at Maynooth University, Rory Hearne, has reiterated that the lack of availability of these types of properties is contributing to homelessness.
"Rents have increased and there's also no control on new market rents," the Tramore native said.
"So, we're seeing all the new units coming to the market are on rents which are on €2,000 a month or €2,500 a month.
"And of course, a lot are build-to-rent, which are very high-end units."
The report comes on a day when the Society of Charter Surveyors Ireland says the number of new homes in Ireland will need to increase by 8% per year to meet the Housing for All targets by 2030.
Their annual property review is warning that rising construction costs may negatively impact housing completions this year and next.
"We're actually seeing the wheels falling off the government's Housing for All plan completely," Assistant Professor Hearne said, "because it was - as I argued from the outset - overly reliant on the private market to provide housing.
"That market now is in an even worse state."
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