US Route 60 and Arizona State Route 74 seemingly for a time were co-signed on the Sunkist Highway. Both highways appear signed on the Sunkist Highway on the 1933 Midwest Map of Arizona. US Route 70 would be extended into California during 1934 and multiplexed US Route 60 on the Sunkist Highway. Following US Route 70 being extended into California the original Arizona State Route 74 appears to have been deleted.
The current Arizona State Route 74 was defined during 1962. Arizona State Route 74 was planned with an alignment originating at US Route 60-70-89 in Morristown east to Interstate 17 in New River.