{{infobox settlement | name = san isidro | native_name = balen ning san isidru | native_name_lang = fil | settlement_type = municipality | image_skyline = sanisidro35halljf.jpg | image_caption = town hall | image_flag = | image_seal = fvfnuevaecija9719a_02.jpg | nickname = | motto = | image_map =  | map_caption = map of nueva ecija showing the location of san isidro | pushpin_map = philippines | pushpin_map_caption = location within the philippines | latd = 15 |latm = 16 |latns = n | longd = 120|longm = 54 |longew = e | coordinates_region = ph | coordinates_display = title,inline | coordinates_footnotes = | subdivision_type = country | subdivision_name =  | subdivision_type1 = region | subdivision_name1 = central luzon (region iii) | subdivision_type2 = province | subdivision_name2 =  | subdivision_type3 = district | subdivision_name3 = 4th district | established_title = founded | established_date = | parts_type = barangays | parts_style = para | p1 = 9 | leader_party = | leader_title = mayor | leader_name = cesario lopez jr. | government_footnotes =  | area_footnotes =  | area_total_km2 = 56.49 | elevation_footnotes = | elevation_m = | population_footnotes =  | population_total = 47800 | population_as_of = 2010 | population_density_km2 = auto | population_demonym = | population_note = | timezone = pst | utc_offset = +8 | postal_code_type = zip code | postal_code =  | area_code_type = dialing code | area_code =  | blank_name_sec1 = income class | blank_info_sec1 = 2nd class; partially urban | website = | footnotes
Former_provincial_capitals_of_the_Philippines Municipalities_of_Nueva_Ecija Populated_places_on_the_Pampanga_River