The constituency elected one
Member of Parliament (MP) by the
first past the post system until the seat was abolished for the
1885 general election. {{cite web| url = http://www.historyofparliamentonline.org/volume/1715-1754/constituencies/haddington-burghs {{cite web| url = http://www.historyofparliamentonline.org/volume/1754-1790/constituencies/haddington-burghs | title= Haddington Burghs {{cite web| url = http://www.historyofparliamentonline.org/volume/1790-1820/constituencies/haddington-burghs {{cite web| url = http://www.historyofparliamentonline.org/volume/1820-1832/constituencies/haddington-burghs In 1885, Haddington, Dunbar, and North Berwick were merged into the
county constituency of
Haddingtonshire, Lauder was merged into the county constituency of
Berwickshire, and Jedburgh was merged into the county constituency of
Roxburghshire. ==Members of Parliament==