Yolo County is a county located in the northern portion of the U.S. state of California. As of the 2010 census, the population was 200,849. Its county seat is Woodland.
Monument Hills is a census-designated place in Yolo County, California. Monument Hills sits at an elevation of 135 feet (41 m). The 2010 United States census reported Monument Hills's population was 1,542. The area is surrounded by rolling hills, breathtaking mountains, and sprawling valleys.