It has been the practice of all Nigerian Federal Universities to admit students within their catchment first before considering other students outside their catchment area, so I have decided to make a research on this and here a list of some universities and their catchment areas:
1 Ahmadu Bello University: Kaduna Adamawa ,
Bauchi, Benue,Borno, Jigawa, Kaduna, Kano, Gombe,
Kebbi, Kogi, Kwara, Katsina, Niger, Plateau, Sokoto,
Nasarawa, Yobe, Zamfara, Taraba

2 ATBU: Bauchi Adamawa, Bauchi, Benue, Borno,
Gombe, Taraba,Yobe

3 BAYERO UNIVERSITY: Kano Jigawa, Kaduna, Kano, Katsina, Kebbi, Sokoto, Zamfara

4 FUTA:Ondo Ekiti, Lagos, Osun, Oyo, Ondo

5 FUTMinna: Minna Niger, Benue, Kebbi, Kogi,
Kwara, Nasarawa,Niger, Plateau,Sokoto, Zamfara

6 FUTO: Imo, Abia, Anambra, Ebonyi, Imo, Enugu

7 FUT Yola: Adamawa, Bauchi, Borno, Gombe,
Taraba, Yobe

8 OAU: Osun Ekiti, Lagos, Osun, Oyo, Ondo

9 UDU: Sokoto Jigawa, Kwara, Kebbi, Katsina, Kano,
Kano, Kaduna,
Nasarawa, Niger, Sokoto, Zamfara

10 UNN: Enugu Abia, Anambra, Bayelsa, Cross-
River, Delta,Ebonyi, Edo, Enugu, Imo, Rivers

11 UNIBEN: Edo Akwa-Ibom, Bayelsa, Cross-River,
Delta, Edo, Rivers

12 UNICAL: Cross-Rivers Akwa-Ibom, Bayelsa,
Cross-River, Delta,Edo, Rivers

13 UNIJOS: Plateau Benue, Kebbi, Kogi, Kwara,
Nasarawa, Niger,Plareau

14 UNILAG: Lagos Ekiti, Lagos, Osun, Oyo, Ondo,
Ogun

15 UNILORIN: Ilorin Benue, Kebbi, Kogi, Kwara,
Nasarawa,Plareau, Sokoto, Zamfara and some South Western States

16 UNIMAID: Borno Adamawa, Borno. Bauchi,
Gombe, Taraba,Yobe

17 UNIUYO: Akwa-Ibom Akwa-Ibom, Bayelsa, Cross-
River, Delta,Edo, Rivers

18 UNIZIK: Anambra, Abia, Anambra, Enugu,
Ebonyi, Imo

19 UNIABUJA: UI, UMUDIKE, MAKURDI, UNIPORT,
UNAAB, FUPRE, All States of the Federation.

There are also some states which are accepted as
catchment states in any federal university, and they are called EDUCATIONAL LESS PRIVILEGED STATES (ELPS) and you seem lucky if you are from any of these states,
namely: Adamawa, Bauchi, Bayelsa, Benue, Borno,
Cross-River, Ebonyi Gombe, Jigawa, Kaduna, Kano, Katsina, Kebbi, Kogi, Kwara, Nasarawa, Niger, Plateau, Rivers, Sokoto, Taraba, Yobe, Zamfara.
According to the Federal Government (NUC)
Admission Policy; 20% of those offered admission are supposed to be from ELPS.

NOTE!!!: If the university you chose during JAMB registration doesn't have your State of Origin as their catchment area, it doesn't mean that's the end of the world but it means you have a low probability of gaining admission into that university. Just be prayerful.

please share if you find this info useful. If you have any question or contrary opinion to the above info, please use the comment box but in a mature manner. Thanks.
Ayomide Oluwatomisin Olukoga