English English Wikipedia has an article on:LoudounWikipedia Proper noun Loudoun A parish of East Ayrshire council area, Scotland. It was also included in the name of Kilmarnock and Loudoun District, but this was merged into East Ayrshire in 1996. Derived terms Loudoun County loudounite (from Loudoun County) See also LoudonWikiwand - on Seamless Wikipedia browsing. On steroids.