I'm fairly sure that this list is accurate. I found most of it here and modified so that it fits with the information on the Serbian Government's site here and here, so this should be right. While towns other than Belgrade and Niš ( Novi Sad, Kragujevac, Priština (?)) are made up of opštine, it appears, according to the map at that last link, that those have no status on the national level.
Belgrade
- Barajevo (Belgrade)
- Čukarica (Belgrade)
- Grocka (Belgrade)
- Lazarevac (Belgrade)
- Mladenovac (Belgrade)
- Novi Beograd (Belgrade)
- Obrenovac (Belgrade)
- Palilula (Belgrade)
- Rakovica (Belgrade)
- Savski Venac (Belgrade)
- Sopot (Belgrade)
- Stari Grad (Belgrade)
- Surčin (Belgrade)
- Voždovac (Belgrade)
- Vračar (Belgrade)
- Zemun (Belgrade)
- Zvezdara (Belgrade)
Niš
A
Ada Aleksandrovac Aleksinac Alibunar Apatin Aranđelovac Arilje
B
Babušnica Bač Bačka Palanka Bačka Topola Bački Petrovac Bajina Bašta Batočina Bečej Bela Crkva Bela Palanka Beočin Blace Bogatić Bojnik Boljevac Bor Bosilegrad Brus Bujanovac
C
Č
Ć
D
Dečani Despotovac Dimitrovgrad Doljevac
Đ
G
Gadžin Han Glogovac Gnjilane Golubac Gora Gornji Milanovac
I
J
K
Kačanik Kanjiža Kikinda Kladovo Klina Knić Knjaževac Koceljeva Kosjerić Kosovo Polje Kosovska Kamenica Kosovska Mitrovica Kovačica Kovin Kragujevac Kraljevo Krupanj Kruševac Kučevo Kula Kuršumlija
L
Lajkovac Lapovo Lebane Leposavić Leskovac Lipljan Loznica Lučani Ljig Ljubovija
M
Majdanpek Mali Iđoš Mali Zvornik Malo Crniće Medveđa Merošina Mionica
N
Negotin Nova Crnja Nova Varoš Novi Bečej Novi Kneževac Novi Pazar Novi Sad Novo Brdo
O
Obilić Odžaci Opovo Orahovac Osečina
P
Pančevo Paraćin Peć Pećinci Petrovac Pirot Plandište Podujevo Požarevac Požega Preševo Priboj Prijepolje Priština Prizren Prokuplje
R
Rača Raška Ražanj Rekovac Ruma
S
Sečanj Senta Sjenica Smederevo Smederevska Palanka Sokobanja Sombor Srbica Srbobran Sremska Mitrovica Sremski Karlovci Stara Pazova Subotica Surdulica Suva Reka Svilajnac Svrljig
Š
T
Temerin Titel Topola Trgovište Trstenik Tutin
U
V
Valjevo Varvarin Velika Plana Veliko Gradište Vitina Vladičin Han Vladimirci Vlasotince Vranje Vrbas Vrnjačka Banja Vršac Vučitrn
Z
Zaječar Zrenjanin Zubin Potok Zvečan