Georgia State Route 120 Loop (Marietta)
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| Alternate route of SR 120 | |
| Maintained by GDOT | |
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| West end |
  SR 5 / SR 120 in Marietta
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| East end |
 SR 3 Conn. / SR 120 in Marietta
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| Location | {{{location}}} |
| Length | 9.0 mi (14 km) |
North and South Marietta Parkway form a ring road in Marietta, Georgia that was once designated as Georgia State Route 120 Loop (SR 120 Loop) before route realignments in 2007. The full loop is approximately 9 miles (14 km) in circumference and has an interchange with Interstate 75 (I-75) twice, once on the north side of Marietta and once on the south side. The southern segment of the road is designated as a part of SR 120 and the northern segment forms SR 120 Alternate (SR 120 Alt.).
A portion of SR 5 has a concurrency with SR 120 Alt. from U.S. Route 41 (US 41) west to the SR 120 mainline.
SR 120 Loop was built over an approximately 20-year span from 1967 to 1989. The first sections complete and open to traffic extended east of US 41 and included the interchanges with then-new I-75, and with mainline SR 120. While the northern part went through what is still farmland as of December 2007[update], the southern part went through existing neighborhoods, destroying several homes and cutting-off several streets, much like I-75 had done previously.
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