San Sebastián del Oeste is a town and municipality, located on the western part of Jalisco state, Mexico, between 20°39’45’’ - 21°02’30’’ …San Sebastián del Oeste is a town and municipality, located on the western part of Jalisco state, Mexico, between 20°39’45’’ - 21°02’30’’ N and 104°35’00’’ - 104°51’00’’ W, at a height of 1,480 metres.