Boulder Flats is a census-designated place (CDP) in Fremont County, Wyoming, United States.

[4] According to the United States Census Bureau, the CDP has a total area of 18.2 square miles (47.2 km2), all land.

18.9% of all households were made up of individuals, and 4.1% had someone living alone who was 65 years of age or older.

The majority of Boulder Flats is served by Fremont County School District #14.

A very small portion of the CDP is located within the boundaries of Fremont County School District #21.