It is a 4th class city in the province of Nueva Ecija, Philippines.
Gapan is nicknamed the "Footwear Capital of the North", and it is an inseparable part of the Rice Granary of the Philippines. According to the latest census, it has a population of 98,795 people in 18,200 households. It has a land area of 164.44 km².
Gapan City is located in the southern part of the province. It is bounded to the north by Peñaranda and San Leonardo, to the east by the Gen. Tinio, to the south by San Miguel in neighboring Bulacan province, and to the west by San Isidro.