Pilar is located in eastern part of Bataan Peninsula, bordering Balanga (the provincial capital) to the north, Orion to the south, Bagac to the west, and Manila Bay to the east.

The Bataan Government Center and the historic Mount Samat National Shrine (Dambana ng Kagitingan) are both situated within the municipality in Barangays Diwa and Ala-uli, respectively.

Poverty incidence of Pilar Source: Philippine Statistics Authority[12][13][14][15][16][17][18][19] Pursuant to the Local Government Code of the Philippines",[20][21] the political seat of the municipal government is located at the Municipal Hall.

During the American rule (1898–1946), the elected Mayor and local officials, including the appointed ones held office at the Municipal Hall.

Landmarks and festivals of Pilar include: The 1801 Our Lady of the Pillar Parish Church (Nuestra Señora del Pilar Parish Church,[24] belongs to the Roman Catholic Diocese of Balanga[25][26][27] (Dioecesis Balangensis) Part of the Ecclesiastical Province of San Fernando, Pampanga.