c. 108), An Act for the Regulation of Municipal Corporations in Ireland, was passed by the Parliament of the United Kingdom on 10 August 1840.

From 1801, this number was reduced to 33 boroughs entitled to send MPs to the United Kingdom House of Commons.

In addition, there were seven boroughs which were "at not very remote periods, Corporate Municipalities, acting, or at least constituted, under Royal Charters still on record".

There were five boroughs, "the existence either of a corporation or of burgage tenure is noticed in ancient records, but no charter of incorporation [was] discovered".

Boroughs in Schedule I were already effectively extinct at the time of the passing of the Act, and so were not permitted to apply for such a charter.