Oasis is a census-designated place in the California county of Riverside.

[2] Oasis sits at an elevation of 141 feet (43 m) below sea level.

[2] The 2020 United States census reported Oasis's population was 4,468, down from 6,890 in 2010.

[3] According to the United States Census Bureau, the CDP covers an area of 19.6 square miles (50.8 km2), all of it land.

The racial makeup of Oasis was 1,693 (24.6%) White, 22 (0.3%) African American, 96 (1.4%) Native American, 42 (0.6%) Asian, 0 (0.0%) Pacific Islander, 4,927 (71.5%) from other races, and 110 (1.6%) from two or more races.