San Fabian has a land area of 8, 129 hectares and has a population of 76,274. There are 34 barangays in San Fabian:
- Alacan
- Ambalangan-Dalin
- Angio
- Anonang
- Aramal
- Bigbiga
- Binday
- Bolaoen
- Bolasi
- Cabaruan
- Cayanga
- Colisao
- Gomot
- Inmalog Norte
- Inmalog Sur
- Lekep Butao
- Lipit Tomeeng
- Longos Amangonan-Parac-Parac
- Longos Central
- Longos Proper
- Mabilao
- Nibaliw Center
- Nibaliw East
- Nibaliw Narvarte
- Nibaliw Magliba
- Nibaliw Vidal
- Palapad
- Poblacion
- Rabon
- Sagud Bahley
- Sobol
- Tempra Guilig
- Tiblong
- Tocok
The town fiesta of San Fabian is January 19 to 20. Major industries to make proud of San Fabian are:
- Commercial Crops
- Hatchery(chicks, aqua)
- Aquaculture
- Livestock and Poultry
- Salt Making Refinery