Rancho Cucamonga was a 13,045-acre (52.79 km2) Mexican land grant in present day San Bernardino County, California given in 1839 to dedicated soldier, smuggler and politician, Tiburcio Tapia by Mexican governor Juan Bautista Alvarado. The grant encompassed present day Rancho Cucamonga. The rancho extended easterly from San Antonio Creek to what is now Turner Avenue (Hermosa), and from today's Eighth Street to the mountains.
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