It merged with Ballymena Borough Council and Larne Borough Council in May 2015 under local government reorganisation in Northern Ireland to become Mid and East Antrim Borough Council.The council was based at Carrickfergus Town Hall and the council administered the town, on the north shore of Belfast Lough, and surrounding area, which extended from Greenisland in the south-west to Whitehead in the east.The borough was 32 square miles (83 km2), with a population of just over 39,000.Together with the neighbouring district of Larne and small parts of Newtownabbey and Moyle, it formed the East Antrim constituency for elections to the Westminster Parliament and Northern Ireland Assembly.This is a list of mayors and sheriffs of Carrickfergus Corporation from 1523 to the passing of The Municipal Corporations (Ireland) Act 1840 Henry VIII Elizabeth I James I Charles I Charles II James II William and Mary George I George II George III George IV William IV Victoria List of mayors of Carrickfergus Borough Council since 1949 George VI Elizabeth II List of Honorary Freemen of Carrickfergus Borough Council since 1949 15 October 1956 The area covered by Carrickfergus Borough Council had a population of 39,114 residents according to the 2011 Northern Ireland census.