According to the Philippine Statistics Authority, the municipality has a land area of 48.07 square kilometres (18.56 sq mi) [5] constituting 1.15% of the 4,165.25-square-kilometre- (1,608.21 sq mi) total area of Abra.

San Isidro is politically subdivided into 9 barangays.

[3] The population density was 99 inhabitants per square kilometre (260/sq mi).

Poverty Incidence of San Isidro Source: Philippine Statistics Authority[12][13][14][15][16][17][18][19] San Isidro, belonging to the lone congressional district of the province of Abra, is governed by a mayor designated as its local chief executive and by a municipal council as its legislative body in accordance with the Local Government Code.

This article about a location in the Cordillera Administrative Region is a stub.