Onstott Road is a pair of intermittent frontage roads that run along alternate sides of Highway 99 between Encinal Road in Lomo and Franklin Road in Yuba City. It is named for John Paxton Onstott.

The northernmost segment is called Onstott Frontage Road and runs on the western (southbound) side of Highway 99 between Encinal Road in Lomo and Eager Road on the border of Sullivan and Berg.

The next segment is called East Onstott Road and begins at Eager Road directly across Highway 99 from where the northernmost segment ends. It runs on the eastern (northbound) side of Highway 99 between there and Butte House Road in Yuba City.

A short segment called West Onstott Road runs on the western side of Highway 99 opposite East Onstott Road. This segment of West Onstott Road runs between Pease Road on the border of Berg and Yuba City and Queens Avenue in Yuba City.

A very short segment called Onstotte Road (with an "e" on the end) leads south from Woodward Street on the west side of Highway 99 in Yuba City and dead-ends.

Another very short segment called East Onstott Road dead-ends slightly farther south, on the east side of Highway 99.

Directly opposite from that, the southernmost segment is alternately called West Onstott Frontage Road or just West Onstott Road and runs south from there to Franklin Road on the border of Yuba City and South Yuba City. Significant places on this segment include Guidera's Harley-Davidson.