Mercer County

There's more than one place called Mercer County:

United States of America

 * Mercer County (Illinois)
 * Mercer County (Kentucky)
 * Mercer County (Missouri)
 * Mercer County (New Jersey)
 * Mercer County (North Dakota)
 * Mercer County (Ohio)
 * Mercer County (Pennsylvania)
 * Mercer County (West Virginia)