Harbor Boulevard
| Maintained by | Local jurisdictions |
|---|---|
| South end |
 SR 55 (Newport Boulevard) in Costa Mesa
|
| Major junctions |
 I-405 in Costa Mesa I-5 in Anaheim
|
| North end | Fullerton Road in Rowland Heights |
Harbor Boulevard is the busiest north-south corridor in Orange County, California. The thoroughfare passes through some of the most densely populated areas in the region and carries about 8 percent of the county’s bus riders.
It runs from Costa Mesa through Santa Ana, Garden Grove, Anaheim, Fullerton, La Habra and La Habra Heights before it turns into Fullerton Road in the unincorporated community of Rowland Heights just over the Los Angeles County line.
The portion of Harbor Boulevard between La Palma Avenue in Anaheim to Whittier Boulevard in La Habra was part of the historical routing of U.S. Route 101, which was at the time the Coast Route from the Mexican Border to Oregon.
North Harbor Boulevard, where it rises from La Habra and passes over the Puente Hills, follows the historical route of the 1769 Portolà expedition, first Europeans to explore inland California.
The route is in Orange County except for a mile in Los Angeles County.
The Orange County Transportation Authority began the Central Harbor Boulevard Transit Corridor Study in 2016 to improve transit along Harbor Boulevard in northern and central Orange County between Westminster Boulevard in Santa Ana and Chapman Avenue in Fullerton. The study will analyze and develop transportation options to move people through the area.
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Wikipedia