| State Highway 21 | ||||
|---|---|---|---|---|
| Route information | ||||
| Maintained by TxDOT | ||||
| Length: | 272.7 mi (438.9 km) | |||
| Existed: | before 1917 – present | |||
| Major junctions | ||||
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| East end: |
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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
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I-45 / US 190 in Madisonville
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I-69 / US 59 in Nacogdoches