Chula Vista, CA

ZIP code 91921 covers the picturesque city of Palomar Mountain in San Diego County, California. This remote area is home to attractions such as Palomar Mountain State Park, known for its scenic hiking trails and camping facilities, as well as the famous Palomar Observatory, which houses the Hale Telescope. With its tranquil surroundings and stunning mountain views, ZIP code 91921 offers a peaceful retreat for nature enthusiasts and stargazers alike.