| Name | ISO3166-2code | Seal | Location | City | Geopoliticalzone | Area | Population(2019estimate) | Density(pop/km²) |
| Capital | Largest |
| Abia | AB | | | Umuahia | Aba | South East | 6,320 km2 (2,440 sq mi) | 3,841,943 | 607 |
| Adamawa | AD | | | Yola | North East | 36,917 km2 (14,254 sq mi) | 4,536,948 | 123 |
| Akwa Ibom | AK | | | Uyo | South South | 7,081 km2 (2,734 sq mi) | 4,780,581 | 675 |
| Anambra | AN | | | Awka | Onitsha | South East | 4,844 km2 (1,870 sq mi) | 5,599,910 | 1,157 |
| Bauchi | BA | | | Bauchi | North East | 45,893 km2 (17,719 sq mi) | 7,540,663 | 164 |
| Bayelsa | BY | | | Yenagoa | South South | 10,773 km2 (4,159 sq mi) | 2,394,725 | 222 |
| Benue | BE | | | Makurdi | North Central | 34,059 km2 (13,150 sq mi) | 5,787,706 | 170 |
| Borno | BO | | | Maiduguri | North East | 70,898 km2 (27,374 sq mi) | 5,751,590 | 81 |
| Cross River | CR | | | Calabar | South South | 20,156 km2 (7,782 sq mi) | 4,175,020 | 207 |
| Delta | DE | | | Asaba | South South | 17,698 km2 (6,833 sq mi) | 5,307,543 | 300 |
| Ebonyi | EB | | | Abakaliki | South East | 6,400 km2 (2,500 sq mi) | 3,007,155 | 470 |
| Edo | ED | | | Benin City | South South | 19,559 km2 (7,552 sq mi) | 4,461,137 | 228 |
| Ekiti | EK | | | Ado Ekiti | South West | 6,353 km2 (2,453 sq mi) | 3,350,401 | 528 |
| Enugu | EN | | | Enugu | South East | 13,161 km2 (5,081 sq mi) | 4,396,098 | 334 |
| Federal Capital Territory | FC | | | Abuja | North Central | 7,315 km2 (2,824 sq mi) | 1,406,239 | 192 |
| Gombe | GO | | | Gombe | North East | 18,768 km2 (7,246 sq mi) | 3,623,462 | 193 |
| Imo | IM | | | Owerri | South East | 5,530 km2 (2,140 sq mi) | 5,167,722 | 935 |
| Jigawa | JI | | | Dutse | North West | 23,154 km2 (8,940 sq mi) | 6,779,080 | 293 |
| Kaduna | KD | | | Kaduna | North West | 46,053 km2 (17,781 sq mi) | 8,324,285 | 181 |
| Kano | KN | | | Kano | North West | 20,131 km2 (7,773 sq mi) | 14,253,549 | 708 |
| Katsina | KT | | | Katsina | North West | 24,192 km2 (9,341 sq mi) | 9,300,382 | 384 |
| Kebbi | KE | | | Birnin Kebbi | North West | 36,800 km2 (14,200 sq mi) | 5,001,610 | 136 |
| Kogi | KO | | | Lokoja | North Central | 29,833 km2 (11,519 sq mi) | 4,153,734 | 139 |
| Kwara | KW | | | Ilorin | North Central | 36,825 km2 (14,218 sq mi) | 3,259,613 | 89 |
| Lagos | LA | | | Ikeja | Lagos | South West | 3,577 km2 (1,381 sq mi) | 12,772,884 | 3572 |
| Nasarawa | NA | | | Lafia | North Central | 26,256 km2 (10,137 sq mi) | 2,632,239 | 100 |
| Niger | NI | | | Minna | North Central | 76,363 km2 (29,484 sq mi) | 6,220,617 | 81 |
| Ogun | OG | | | Abeokuta | South West | 16,981 km2 (6,556 sq mi) | 5,945,275 | 350 |
| Ondo | ON | | | Akure | South West | 15,500 km2 (6,000 sq mi) | 4,969,707 | 321 |
| Osun | OS | | | Osogbo | South West | 9,251 km2 (3,572 sq mi) | 4,237,396 | 458 |
| Oyo | OY | | | Ibadan | South West | 28,454 km2 (10,986 sq mi) | 7,512,855 | 264 |
| Plateau | PL | | | Jos | North Central | 30,913 km2 (11,936 sq mi) | 4,400,974 | 142 |
| Rivers | RI | | | Port Harcourt | South South | 11,077 km2 (4,277 sq mi) | 7,034,973 | 635 |
| Sokoto | SO | | | Sokoto | North West | 25,973 km2 (10,028 sq mi) | 5,863,187 | 226 |
| Taraba | TA | | | Jalingo | North East | 54,473 km2 (21,032 sq mi) | 3,331,885 | 61 |
| Yobe | YO | | | Damaturu | Potiskum | North East | 45,502 km2 (17,568 sq mi) | 3,398,177 | 75 |
| Zamfara | ZA | | | Gusau | North West | 39,762 km2 (15,352 sq mi) | 5,317,793 | 134 |