Two other towns in the region made the top 30.
A Laois town is among the least obsessed with country music.
Portarlington ranks second-last on Digital Funnel's new survey, which examined nearly 80 towns in Ireland.
Mullingar just scrapes the top 10 most-obsessed with country music, while Portlaoise comes in at 14 on the list.
The new survey also shows Tullamore and Athlone are among the top 30 country music fans.
Kinnegad and Edenderry join Portarlington in the bottom-half of the rankings.
Donegal is home to both the most and least obsessed country music towns in the country, with Letterkenny and Ranafast, respectively.
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