Interstate 680 is the designation for three tertiary interstate routes.

California

Interstate 680 in California is a busy north-south freeway in the San Francisco Bay Area. I-680 spans just over 70 miles (113.4 km) from its northern terminus in Cordelia to its southern terminus in San Jose.

Major cities

• Benicia
• Martinez
• Concord
• Pleasant Hill
• Walnut Creek
• Danville
• San Ramon
• Dublin
• Pleasanton
• Fremont
• Milpitas
• San Jose

Nebraska-Iowa

Interstate 680 in Nebraska and Iowa is the northern bypass freeway for the Omaha, Nebraska-Council Bluffs, Iowa metropolitan area. I-680 spans 42.86 miles from its western terminus in western Omaha to its eastern terminus roughly 27 miles northeast of Council Bluffs. For a 14-mile stretch, I-680 is co-signed with Interstate 29.

Major cities and suburbs

• Omaha, Nebraska
• Council Bluffs, Iowa

Ohio

Interstate 680 in Ohio is the primary interstate traveling through Youngstown, Ohio. Its northern terminus is with Interstate 80 and its southern terminus is with Interstate 76 (Ohio Turnpike).

See Interstate 80