Mandaon is a philippine municipality in the province Masbate in Region V Bicol Region which belongs to the Luzon group of islands. The municipality Mandaon is seated about 32 km west-south-west of province capital City Of Masbate and about 360 km south-east of Philippine main capital Manila.
Mandaon is a 3rd class municipality. Regarding urbanization Mandaon is classified as partly urban. Mandaon occupies an area of 280.80 km². By the end of 2007 Mandaon was the home of 34,401 residents. Thus by average 122.51 people are living on one km².
Administratively the Municipality of Mandaon is subdivided into 26 barangays. One forms the center of the city wheras the other 25 are in the outlying areas. Some of them are even several kilometers away from the center of the Municipality. The most populous are Santa Fe, Cagmasoso, Mabatobato, Centro, San Pablo, Guincaiptan, Nanipsan, Pinamangcaan, Looc, San Juan, Laguinbanwa, Nailaban, Buri, Polo Dacu, Canomoy.
Among the bigger cities and municipalities in the neighborhood of Mandaon there are Cawayan 49 km east-south-east, Roxas City (Capiz) 92 km south-west, Pilar (Sorsogon) 88 km north-north-east, Bulan (Sorsogon) 80 km north-east, City Of Masbate 32 km east-north-east, Aroroy 33 km north-north-east, Placer 80 km east-south-east, Uson 48 km east, Irosin (Sorsogon) 96 km east-north-east as well as 75 km south-south-west of Mandaon the municipality Carles (Iloilo).