This 1,676-acre wildlife area lies in the muck farming region of north central Ohio, four miles southwest of the city of Willard. Section Line Road provides access to the area from U.S. Route 224, three miles west of Willard. The area may also be reached by driving west of Bullhead Road from its junction with U.S. Route 224, and continuing 1.5 miles past the village of Celeryville.
Willard Marsh Wildlife Area is quite flat, with little natural drainage. Approximately two-thirds of the area is woodland; the remainder is divided about equally between openland and brushland.