Closest to AL,CN,LA in total GDP.
Ireland GDP (2007)IMF: $261 billion
World Bank: $255 billion
According to
wiki, which seems to be sourcing the US Bureau of Economic Analysis, the figures for the states you cite are:
Connecticut: $216 billion
Louisiana: $216 billion
Alabama: $166 billion
But Minnesota ($255 billion) and Maryland ($269 billion) are much closer to the Irish figures.
On a per capita basis, only Delaware seems to be a reasonable comparison.
Since Alabama is full of Irish, it's got to be Alabama.