Suyo is a philippine municipality. It is located in the province Ilocos Sur in Region I Ilocos Region which is a part of the Luzon group of islands. The municipality Suyo is seated about 68 km south-south-east of province capital City Of Vigan and about 271 km north of Philippine main capital Manila. The geographic coordinates of Suyo are 16° 58' 48'' N, 120° 31' 36'' E.
Administratively the Municipality of Suyo is subdivided into 8 barangays. One forms the center of the city wheras the other 7 are in the outlying areas. Some of them are even several kilometers away from the center of the Municipality.
According to the 2007 census, Suyo has a population of 10,943 residents and is part of the big group of 1073 cities and municipalities in the Philippines which have more than 10.000 residents but did not reach 50.000 population yet. Based on the number of its inhabitants Suyo is number 1491 of the most populous cities of the Philippines and at 687 in Luzon group of islands and at 21 of the most populous cities of province Ilocos Sur. With an area of 124.00 km² Suyo is one of the cities with a smaller urban area. Based on its area area, it ranks only as the 5th of the smallest cities of the province of Ilocos Sur.