Mabini is located in the eastern part of the province. It was established in 1904 out of the barrios of Abaca, Banlas, Bulawan, Lungsodaan, Minol, Poblacion 1 and 2 and Tambo which then belonged to Candijay; Cabulao and San Jose which then belonged to Ubay and Batuanan which a that time was a barrio of Mabini. The first settlers of Sitio Libas came from Duero, Loboc, Guindulmlan, Jagna and Sevilla. The barrios were organized into a new town through the initiative of its parish priest, Fr. Jimenez and municipal president Canuto Bernales.
| Mabini at a glance | |
| Population (2015): | 27171 |
| Population (2010): | 28174 |
| Population (2000): | 27250 |
| Number of households (2000): | 5047 |
| Land area: | 6455 ha |
| Number of barangays: | 22 |
| Distance from Tagbilaran: | 104 km |
| Barangay | Population (2000) | Households (2000) | Population (2010) | Population (2015) |
| Abaca | 2231 | 438 | 2349 | 2413 |
| Abad Santos | 653 | 115 | 720 | 567 |
| Aguipo | 1528 | 281 | 1368 | 1231 |
| Baybayon | 1513 | 280 | 1508 | 1314 |
| Bulawan | 633 | 120 | 658 | 533 |
| Cabidian | 1081 | 198 | 1040 | 903 |
| Cawayanan | 1632 | 312 | 1552 | 1568 |
| Concepcion (Banlas) | 1295 | 234 | 1259 | 1215 |
| Del Mar | 682 | 121 | 759 | 833 |
| Lungsoda-an | 1050 | 200 | 1130 | 1081 |
| Marcelo | 936 | 152 | 1000 | 918 |
| Minol | 1380 | 229 | 1414 | 1399 |
| Paraiso | 620 | 128 | 819 | 821 |
| Poblacion I | 1347 | 293 | 1425 | 1405 |
| Poblacion II | 1659 | 234 | 1697 | 1675 |
| San Isidro | 1446 | 272 | 1633 | 1638 |
| San Jose | 1482 | 316 | 1427 | 1403 |
| San Rafael | 679 | 111 | 736 | 683 |
| San Roque (Cabulao) | 2391 | 451 | 2529 | 2548 |
| Tambo | 768 | 144 | 914 | 874 |
| Tangkigan | 1434 | 285 | 1438 | 1350 |
| Valaga | 810 | 133 | 799 | 799 |
(Based on figures from the census of 2000, 2010, and 2015 from PSA)