Hillsdale is a town in Garfield County, Oklahoma, United States.

According to the United States Census Bureau, the town has a total area of 0.3 square miles (0.9 km2), all land.

[5] According to the United States Census Bureau,[4] there are approximately 75 people, 36 (±17) households, and 30 (±15) families in the town.

The average family size was approximately 3.13, recorded during the 2021 American Community Survey.

[4] The town’s racial makeup was 93% White, 4% American Indian, and 3% Hispanic or Latino; with 3% indicating two or more races.