Several zoos in Europe have them but mostly males and no recent breeding as far as I know, so it looks like they might be on the way out
http://www.zootierliste.de/en/map.php?art=1070306&tab=tab_zootier
Can anyone confirm this but are the only zoos in the US to have pottos is Franklin Park in Boston, Cincinnati Zoo, Cleveland Zoo, Milwaukee County Zoo and the Duke Lemur Center in North Carolina?