Ranch to Market Road 620
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| Route information | ||||
| Length: | 23.329 mi (37.544 km) | |||
| Existed: | 1945 – present | |||
| Major junctions | ||||
| West end: |
 SH 71 in Bee Cave
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 SH 45 in Austin US 183 in Austin
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| East end: |
 I-35 in Round Rock
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| Location | ||||
| Counties: | Travis, Williamson | |||
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Ranch to Market Road 620, Ranch Road 620, or RM 620 is a Ranch to Market Road in the U.S. state of Texas maintained by the Texas Department of Transportation (TxDOT). The 27.1-mile (43.6 km) road begins at SH 71 in Bee Cave in Travis County west of Austin passing along southeastern Lake Travis, western Austin, and several suburban communities west and north of Austin before ending at Bus. I-35-L in Round Rock in Williamson County. The road has major intersections with I-35, US 183, and SH 45.
The road opened in 1945 as a Farm to Market Road. The road is now officially designated by TxDOT as Urban Road 620, but all Urban Roads in Texas retain their former Farm or Ranch to Market highway signs.
RM 620 was originally designated in 1945 as Farm to Market Road 620 from Round Rock to SH 29, the former designation of US 183 south of Liberty Hill before 1951. In 1946, the road was extended to the Travis County line. Two years later, the road was extended to the former community of Hickmuntown, also called Four Points, at the location of the current intersection with RM 2222. The road was completed in 1952 when it was extended to SH 71, known locally before 1965 as RM 93. The road received its Ranch to Market designation in 1956, and its Urban Road designation in 1995. The SH 45 toll road running along a portion of RM 620 opened in 2006. In 2013, the section from IH-35 to BI 35-L was cancelled and given to the city of Round Rock.
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