Sefton Central Labour MP Bill Esterson called on Tory Lord Chancellor Kenneth Clarke to reveal what the government has got planned for the Maghull prison site.
Work was halted at the site last year after it was announced that funding had been blocked.
Since then speculation has been rife over what the prime land would be used for.
Speaking in the House of Commons, Bill Esterson asked Kenneth Clarke: "The Government cancelled the building of the Maghull prison after work had already started. Will the Lord Chancellor take this opportunity to tell my constituents what plans he has for the site, to allay their concerns about the Maghull prison site and nearby greenfield projects, which developers are eyeing up?"
Bill was told that he would receive a full written response from the government on what plans they have for the site.
Bill later said: "For well over 12 months now there has been uncertainty about the future of the Maghull prison land.
"A substantial amount of cash was spent on landscaping the area but at the moment I'm receiving complaints from residents who say the area is still like a building site with large fences.
"Both they and I wall want to know what the plans are for such a large part of our community here in Maghull."
Rumoured uses for the site have included housing and a retail park.
Bill said: "There has been lots of speculation, but the whole of Maghull now just deserves answers on this issue.
"While retail and residential uses have been been suggested, there has been no confirmation either way.
"Obviously the demand for housing in East Sefton is high and the Core Strategy and the future of the greenbelt is a major concern given the Tory-Lib Dem government's relaxation of the planning laws.
"But it is my job to ensure that the people of Maghull have their voices heard on whatever plans there are for the future of our community. And that's what I intend to do."