Agua Dulce is a census-designated place in Los Angeles County, California, United States. It lies at an elevation of 2,526 feet (770 m), northeast of Santa Clarita. The community had a population of 3,342 at the 2010 census and covers a geographic area of about 23 square miles (59 km2). Agua Dulce is on the Pacific Crest Trail. The ZIP code is 91390, and the area code is 661.

Santa Clarita is a city in northwestern Los Angeles County in the U.S. state of California. With a 2020 census population of 228,673, it is the third-most populous city in Los Angeles County, the 17th-most populous in California, and the 103rd-most populous city in the United States. It is located about 30 miles (48 km) northwest of downtown Los Angeles, and occupies 70.75 square miles (183.2 km2) of land in the Santa Clarita Valley, along the Santa Clara River. It is a classic example of a U.S. edge city, satellite city, or boomburb.