State Route 431 was a state route in the U.S. state of Washington. It was an auxiliary route of State Route 4. It started at SR 4 and went north to I-5.^[1]

History

In 1964, a branch of PSH 12 became SR 831. SR 831 was an auxiliary route of U.S. Route 830 and the route was switched to the current designation of SR 4 in 1967. SR 431 was later removed in 1992.

References

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