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State highway numbers

• TX: 51
  • Until 1957: 227, FM 1214, (US 67), 51
  • Until 1939: N/A, (US 67), 137, 143, (US 87), 51
• OK: 134, (US 287)
• CO: (US 287, US 50), 51, (US 138), 166
• NE: 27, (US 30), 19
• SD: 79, US 85A

Except for a bit of the Potash Highway in SD and possibly NE, there were no auto trails along US 385.