Los Angeles is a city of roughly 500 square miles, and a pest problem in Hollywood, Boyle Heights or San Pedro does not look like one in the next. Terrain, building age and distance from the water decide what shows up.
The 2020 census put Los Angeles, the county seat, at 3,898,747 residents. It covers about 500 square miles, from the Pacific shoreline to Mount Lukens, which tops out at about 5,075 feet. The Santa Monica Mountains divide the Los Angeles Basin from the San Fernando Valley, and the Los Angeles River crosses the city in 51 miles of concrete channel.
That range of landforms makes the city a patchwork for pests. Mount Washington climbs above the river, Boyle Heights and Crenshaw lie on the flat basin, and Playa del Rey and San Pedro sit by the water. After World War II the city also sprawled northwest into the San Fernando Valley, so a single address can mean a hillside lot, a flat city block or a valley yard.