El Sobrante is a census-designated place in Riverside County, California. El Sobrante sits at an elevation of 1,283 feet. The 2020 United States census reported El Sobrante's population was 14,039. The area was originally named El Sobrante de San Jacinto, with Maria del Rosario Estudilllo de Aguirre receiving a 5 league land grant in 1846. Her hus…El Sobrante is a census-designated place in Riverside County, California. El Sobrante sits at an elevation of 1,283 feet. The 2020 United States census reported El Sobrante's population was 14,039. The area was originally named El Sobrante de San Jacinto, with Maria del Rosario Estudilllo de Aguirre receiving a 5 league land grant in 1846. Her husband, José Antonio Aguirre, patented the grant in 1867.
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