Nimba County has 17 Administrative Districts (Sanniquellie Mahn, Yarpea Mahn, Yarmein, Gbehlay-Geh, Twan River, Garr-Bain, Doe, Gbi & Doru, Kparblee, Boe & Quilla, Gbor, Zoe-Gbao,Yarwein Mehnsonnoh, Meinpea-Mahn, Leewehpea-Mahn, Wee-Gbehyi-Mahn, and Buu-Yao), with a population of 621,841.
According to the 2022 census by the Liberia Institute of Statistics and Geo-Information Services (LISGIS), the population of the administrative districts stands at 621,841 made up of 312,018 males and 309,823 females representing 50.2% and 49.8.% respectively.
Below is the table.
| Admin District | Male | Female | Total |
| Sanniquellie Mahn | 23,184 | 23,945 | 47,129 |
| Yarpea Mahn | 7,197 | 6,916 | 14,113 |
| Yarmein | 17,218 | 16,305 | 33,523 |
| Gbehlay-Geh | 25,323 | 25,127 | 50,450 |
| Twan River | 23,071 | 22,642 | 45,713 |
| Garr-Bain | 54,178 | 57,618 | 111,796 |
| Doe | 23,208 | 22,324 | 45,532 |
| Gbi & Doru | 4,297 | 3,821 | 8,118 |
| Kparblee | 8,601 | 8,357 | 16,958 |
| Boe & Quilla | 10,456 | 10,287 | 20,743 |
| Gbor | 5,382 | 5,298 | 10,680 |
| Zoe-Gbao | 19,099 | 19,257 | 38,356 |
| Yarwein Mehnsonnoh | 13,035 | 12,315 | 25,350 |
| Meinpea-Mahn | 15,069 | 14,244 | 29,313 |
| Leewehpea-Mahn | 13,862 | 13,345 | 27,207 |
| Wee-Gbehyi-Mahn | 22,451 | 22,577 | 45,028 |
| Buu-Yao | 26,387 | 25,445 | 51,832 |
| Total | 312,018 | 309,823 | 621,841 |