South Monrovia Island's
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South Monrovia Island is a census-designated place in Los Angeles County, California. It sits at an elevation of 384 feet (117 m). It is bounded to the west and north by Monrovia, to the east by Duarte, and to the south by Irwindale. The 2020 United States census reported that South Monrovia Island's population was 6,515.