Karimnagar , Khammam , Krishna , Kurnool , Mahbubnagar , Medak , Nalgonda , Sri Potti Sreeramulu Nellore , Nizamabad , Prakasam , Rangareddy , Srikakulam , Visakhapatnam , Vizianagaram , Warangal and West Godavari . Hyderabad is the capital and, along with the adjoining twin city Secunderabad , is the