La Unión de Isidoro Montes de Oca is a municipality in the Mexican state of Guerrero and is the westernmost municipality in Guerrero. The municipal seat lies at La Unión. The municipality covers an area of .
As of 2005, the municipality had a total population of 25,230.
The main towns are La Unión, population 3,079; , population 2,671; , population 1,417; , population 1,371; , population 1,167; and Surcua, population 1,046.Instituto Nacional de Estadística y Geografía. Principales resultados por localidad 2005 (ITER). Retrieved on 23 December 2008
History
On 26 October 1614, the Dutch Captain Joris van Spilbergen – involved in his country's war with Spain – raided with an expedition of five ships this part of the coast of what was at that time New Spain. At Zacatula he succeeded in capturing the pearl fishing ship San Francisco.Quanchi, Historical Dictionary of the Discovery and Exploration of the Pacific Islands, page 233Myers, Paul A., North to California, Llumina Press, 2004
On 20 July 1993, the municipality of La Unión acquired its current name in commemoration of locally born Independence War hero Isidoro Montes de Oca.
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