In 2005, a new Electoral Amendment Act was introduced, which meant that the 2007 general election would be held with redrawn constituencies. Unlike the minor changes which occurred in 1997 and 2002, this revision brought with it some noticeable changes for the Irish electoral map.
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In Dublin, the West constituency more than doubled in size, although it was a three-seater. Minor adjustments were made to other boundaries in Dublin, but the biggest change was the reduction in the number of seats allocated to the northern constituencies. Each lost one seat, while the Dublin South constituencies retained their fourth seats.