For post offices you have 1 places with "Zaïo" for example. About banks and/or ATMs, 1 possibilities exist (like "Albarid Bank البريد بنك").
In term of pharmacies you can find 1 places (like "Pharmacie Du Centre صيدلية المركز").
These are the principal cities: Zaio, Zaïo ⵣⴰⵢⵢⵓ زايو.
Are you looking for an apartment for sale/rent? Or interested by a house? You can check that on Mubawab.