Sta. Ignacia is a second class municipality with a total land area of 14,607 hectares. It is composed of 24 barangays two of which (Poblacion East and Poblacion West) are located in the urban area while the rest of 22 barangays are located in the rural areas.
The municipality of Sta. Ignacia is situated in the western part of the Province of Tarlac and is bounded by Camiling in the north, Gerona and Paniqui in the east, Tarlac town in the south and Mayantoc in the west. Sta. Ignacia is 25 kilometers northwest of the capital town of Tarlac.
The concreted Romulo Highway with a stretch of 14 kilometers traverses the municipality from north to south. This concreted highway is extended up to the town of Lingayen and city of Alaminos in the province of Pangasinan. It offers a great geographical significance considering that the flow of goods from north to south of the province province also converges in Sta. Ignacia.