La Unión de Isidoro Montes de Oca

La Unión de Isidoro Montes de Oca is one of the 81 municipalities of Guerrero, in south-western Mexico. The municipal seat lies at La Unión. The municipality covers an area of 1,142 km². As of 2005, the municipality had a total population of 25,230. The main towns are La Unión, population 3,079; Petacalco, population 2,671; Zacatula, population 1,417; Lagunillas, population 1,371; El Naranjito, population 1,167; and Surcua, population 1,046.