The following highways are numbered 557:
| Preceded by 556 | Lists of highways 557 | Succeeded by 558 |
Interstate 680 (I-680) is a north–south auxiliary Interstate Highway in Northern California. It curves around the eastern cities of the San Francisco Bay Area from San Jose to I-80 at Fairfield, bypassing cities along the eastern shore of San Francisco Bay such as Oakland and Richmond while serving others more inland such as Pleasanton and Concord.
State Route 34 is a state highway in the U.S. state of California. It runs through Ventura County from Rice Avenue in Oxnard to State Route 118 in Somis.
Junipero Serra Boulevard is a major boulevard in and south of San Francisco named after Franciscan friar Junipero Serra. Within the city, it forms part of the route of State Route 1, the shortest connection between Interstate 280 and the Golden Gate Bridge. The remainder, in San Mateo County, was bypassed or replaced by I-280, the Junipero Serra Freeway. The boulevard was one of several new roads built along the San Francisco Peninsula before the age of freeways, and became a state highway known as Route 237 in 1956, receiving the State Route 117 designation in the 1964 renumbering, only to be deleted from the state highway system the next year. Two other regional highways—Bayshore Highway and Skyline Boulevard—were also upgraded into or bypassed by freeways.
State Route 6 (SR 6) is a state highway that is unsigned. It travels through the central part of the U.S. state of Tennessee from Lawrence County to Sumner County. The highway is related to the following U.S. Highways:
State Route 557 is a two-lane north–south state highway in the central portion of Ohio, a U.S. state. The highway's southern terminus is at a T-intersection with State Route 643 approximately 2 miles (3.2 km) north of Baltic. Its northern terminus is at a T-intersection with the concurrency of U.S. Route 62 and State Route 39 nearly 1.5 miles (2.4 km) west of the unincorporated community of Berlin.
State Route 643 is a two-lane north–south state highway in the central portion of Ohio, a U.S. state. The highway's southern terminus is at a T-intersection with State Route 83 north of Coshocton. Its northern terminus is at a T-intersection with the concurrency of State Route 93 north of Baltic. A section of the route is part of a scenic byway.
