La Mesa is located at 32°46′17″N 117°1′22″W (32.771450, -117.022797). It is bordered by the city of San Diego on the west and north, Spring Valley and Lemon Grove on the south, and El Cajon on the east. It includes the neighborhood of Grossmont.
According to the United States Census Bureau, the city has a total area of 9.1 square miles (24 km2). 9.1 square miles (24 km2) of it is land and 0.04 square miles (0.10 km2) of it (0.44%) is water.
The “Walkway of the Stars” is a pedestrian walkway that has been transformed into an urban park in downtown La Mesa. The vision for a place to recognize La Mesa’s extraordinary volunteers was provided by Councilmember Ruth Sterling. The park’s theme honors the City’s outstanding volunteers who have provided 10,000 or more hours of service to the City of La Mesa. “Walkway of the Stars” is located between the Allison Avenue municipal parking lot and La Mesa Boulevard.