Monument Hills is a census-designated place in Yolo County, California.

The 2010 United States census reported Monument Hills's population was 1,542.

According to the United States Census Bureau, the CDP covers an area of 4.0 square miles (10.4 km2), all of it land.

The racial makeup of Monument Hills was 1,163 (75.4%) White, 20 (1.3%) African American, 32 (2.1%) Native American, 77 (5.0%) Asian, 17 (1.1%) Pacific Islander, 153 (9.9%) from other races, and 80 (5.2%) from two or more races.

1,302 people (84.4% of the population) lived in owner-occupied housing units and 240 people (15.6%) lived in rental housing units.