The last census, in 1980, had placed the population at 680 million.

A 1967 special census placed the city's population at 782.

A July 1, 2006 estimate placed the population at 380,309.

A July 1, 2007 estimate placed the population at 261,816.

The July 1, 2011 estimate placed the population at 192,690.

A July 1, 2009 estimate placed the population at 155,603.

A July 1, 2012 estimate placed the population at 216,312.

New definitions from February 28, 2013 placed the population at 363,000.

The 2006 Irish census placed the population at 292 people.

The 2011 Census estimates placed the town's population at 15,170.