The pillbug Armadillidium vulgare is a common isopod generalist decomposer in most natural landscapes. Past European and US studies have looked at the genetic diversity and frequency of A. vulgare and its feminizing sex ratio distorters, Wolbachia and the f-element. No studies have focused on purely urban environments. This study investigates whether the genetic diversity of A. vulgare and the prevalence of its sex ratio distorters differ between urban and non-urban environments.