Jaen is a philippine municipality in the province Nueva Ecija in Region III Central Luzon which belongs to the Luzon group of islands. The municipality Jaen is seated about 30 km south-west of province capital Palayan City and about 84 km north of Philippine main capital Manila.
Jaen is a 2nd class municipality. Regarding urbanization Jaen is classified as partly urban. Jaen occupies an area of 85.46 km². By the end of 2007 Jaen was the home of 63,474 residents. Thus by average 742.73 people are living on one km².
Administratively the Municipality of Jaen is subdivided into 27 barangays. 4 compose the center of the city wheras the other 23 are in the outlying areas. Some of them are even several kilometers away from the center of the Municipality. The most populous are Ocampo-Rivera District (Pob.), Imelda Pob. (Doña Aurora), Santa Rita, Don Mariano Marcos (Pob.), Calabasa, Malabon-Kaingin, Pakol, San Vicente, Hilera, Pamacpacan, San Pablo, San Roque, Imbunia, Ulanin-Pitak, San Josef (Nabao).
Among the bigger cities and municipalities in the neighborhood of Jaen there are Taguig City (Fourth District) 89 km south-south-east, City Of Antipolo (Rizal) 88 km south-south-east, Caloocan City (Third District) 76 km south, City Of Pasig (Second District) 85 km south-south-east, Quezon City (Second District) 77 km south-south-east, City Of Manila (First District) 83 km south, City Of Parañaque (Fourth District) 93 km south, Bacoor (Cavite) 98 km south, City Of Makati (Fourth District) 86 km south as well as 95 km south of Jaen the municipality City Of Las Piñas (Fourth District).