Texas State Highway 21
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| Route information | ||||
| Maintained by TxDOT | ||||
| Length: | 272.7 mi (438.9 km) | |||
| Existed: | before 1917 – present | |||
| Major junctions | ||||
| West end: |
 I-35 at San Marcos
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 US 96 in San Augustine
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| East end: |
 LA 6 near Milam
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| Location | ||||
| Counties: | Hays, Caldwell, Bastrop, Lee, Burleson, Brazos, Madison, Houston, Cherokee, Nacogdoches, San Augustine, Sabine | |||
| Highway system | ||||
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→
SH 130 Toll / US 183 in Mustang Ridge
US 290 near Paige
US 77 near Lincoln
SH 6 / US 190 in Bryan
I-45 / US 190 in Madisonville
US 287 in Crockett
US 69 in Alto
I-69 / US 59 in Nacogdoches
...
Wikipedia