A "--" in the district column means, that the town is a district-free town, i.e. it is by itself a district.
... telangiectasia[?] Ataxia, Marie's[?] Ataxiophobia[?] Ataxophobia[?] Atelosteogenesis, type II[?] Athabaskan brain stem dysgenesis[?] Athetosis[?] Atopic ...