Eureka is an unincorporated community and census-designated place (CDP) in Clinton County in the U.S. state of Michigan.

As an unincorporated community, Eureka has no legal autonomy of its own but does have its own post office with the 48833 ZIP Code.

[6] U.S. Route 127 runs south–north about 3.0 miles (4.8 km) west of the community and is accessible via Maple Rapids Road.

The post office remains in operation and is located at 7907 North Welling Road in the center of the community.

[13][14] The Eureka Cemetery is located on Hyde Road just south of the center of the community.