renters and fewer homeowners and generally votes Democratic. There are notable exceptions to these general trends, such as strongly Republican Yorba Linda and affluent Anaheim Hills, North Tustin, and Villa Park. North Orange County is predominantly flat, giving way to the Santa Ana Mountains in the Northeast. South Orange County is wealthier, more residential, more Republican, predominantly non-Hispanic white and more recently developed. Irvine, the largest city in the region, is an exception to some of these trends, being not only a major employment center, but also a major tech hub and education center with UCI. Furthermore, the city is an Asian plurality (both South and East Asian), and votes reliably Democratic in recent years. South Orange County almost always includes Irvine, Newport Beach, and the cities to their southeast, including Lake Forest, Laguna Beach, Mission Viejo, and San Clemente. Alternatively, Irvine and Newport Beach are sometimes seen as Central Orange County, acting as a transition zone between north and south; when this viewpoint is taken Tustin is also considered to be in central Orange County. Costa Mesa is sometimes included in South County, although it is located predominantly to the west of the Costa Mesa Freeway and is part of the even street grid network of north Orange County. Irvine is located in a valley defined by the Santa Ana Mountains and the San Joaquin Hills, while much of South Orange County is very hilly. Another region of Orange County is the Orange Coast, which includes the six cities bordering the Pacific Ocean. These are, from northwest to southeast: Seal Beach, Huntington Beach, Newport Beach, Laguna Beach, Dana Point and San Clemente, although Seal Beach is sometimes viewed as an extension of neighboring Long Beach in Los Angeles County. Commercial clusters — edge cities Older cities like Santa Ana, Anaheim, and Fullerton have traditional downtowns dating back to the 19th century, with Downtown Santa Ana being the home of the county, state and federal institutions. However, far more commercial activity is concentrated in clusters of newer commercial development are found in the county's edge cities, the three largest being along Interstate 5 between Disneyland and Downtown Santa Ana South Coast Plaza to the Irvine Business Complex, and at Irvine Spectrum Anaheim—Santa Ana edge city A contiguous strip of commercial development (an edge city) stretches from Disneyland through to MainPlace Mall along the I-5 Santa Ana Freeway, straddling the city