List of all settlements:
- Aledo, Mercer
- Athens, Mercer
- Beulah, Mercer
- Bluefield, Mercer
- Bluewell, Mercer
- Bramwell, Mercer
- Brush Fork, Mercer
- Burgin, Mercer
- Celina, Mercer
- Chickasaw, Mercer
- Clark, Mercer
- Coldwater, Mercer
- Ewing Township, Mercer
- Farrell, Mercer
- Fort Recovery, Mercer
- Fredonia, Mercer
- Golden Valley, Mercer
- Greenville, Mercer
- Grove City, Mercer
- Groveville, Mercer
- Hamilton Square, Mercer
- Harrodsburg, Mercer
- Hazen, Mercer
- Hermitage, Mercer
- Hightstown, Mercer
- Hopewell, Mercer
- Jackson Center, Mercer
- Jamestown, Mercer
- Joy, Mercer
- Keithsburg, Mercer
- Lake Latonka, Mercer
- Lashmeet, Mercer
- Lawrenceville, Mercer
- Matherville, Mercer
- Matoaka, Mercer
- Mendon, Mercer
- Mercer, Mercer
- Mercer, Mercer
- Mercerville, Mercer
- Montcalm, Mercer
- Montezuma, Mercer
- New Boston, Mercer
- New Lebanon, Mercer
- North Henderson, Mercer
- Oakvale, Mercer
- Pennington, Mercer
- Pick City, Mercer
- Princeton, Mercer
- Princeton, Mercer
- Princeton, Mercer
- Princeton Junction, Mercer
- Reynolds Heights, Mercer
- Robbinsville, Mercer
- Rockford, Mercer
- Salvisa, Mercer
- Sandy Lake, Mercer
- Seaton, Mercer
- Sharon, Mercer
- Sharpsville, Mercer
- Sheakleyville, Mercer
- Sherrard, Mercer
- St. Henry, Mercer
- Stanton, Mercer
- Stoneboro, Mercer
- Trenton, Mercer
- Twin Rivers, Mercer
- Viola, Mercer
- West Middlesex, Mercer
- Wheatland, Mercer
- White Horse, Mercer
- Windsor, Mercer
- Yardville, Mercer
- Zap, Mercer