Interstate 110 (I-110) and State Route 110 (SR 110) are two connected highways in Los Angeles County, California. They go between the Port of Los Angeles and Pasadena, going through Downtown Los Angeles. Between the Port of L.A. and Interstate 10, the road is called the Interstate 10. It is called California State Route 110 between Interstate 10 and Pasadena. The whole route is also called the Harbor Freeway. The route is about long.