Y-O Ranch is a census-designated place (CDP) in Platte County, Wyoming, United States.

[4] According to the United States Census Bureau, the CDP has a total area of 2.4 square miles (6.2 km2), all land.

14.5% of all households were made up of individuals, and 3.6% had someone living alone who was 65 years of age or older.

About 13.6% of families and 19.3% of the population were below the poverty line, including 25.5% of those under the age of eighteen and none of those 65 or over.

Public education in the community of Y-O Ranch is provided by Platte County School District #1.