Whetstone is a census-designated place in Cochise County, Arizona, United States, north of Sierra Vista. The population was 2,617 at the 2010 census. Whetstone was often referred to as the "Y" because the intersection of State routes 82 and 90 had an eastbound lane on 90 and a southbound lane on 82 that created a Y at the intersection. Highway …Whetstone is a census-designated place in Cochise County, Arizona, United States, north of Sierra Vista. The population was 2,617 at the 2010 census. Whetstone was often referred to as the "Y" because the intersection of State routes 82 and 90 had an eastbound lane on 90 and a southbound lane on 82 that created a Y at the intersection. Highway 90 ended one to two miles further north and people traveling north had to go via highway 82 east or west and then north on either highway 83 or highway 80.
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