List of all settlements:
- Ashland, Clay
- Avondale, Clay
- Barnesville, Clay
- Bellair-Meadowbrook Terrace, Clay
- Bellevue, Clay
- Birmingham, Clay
- Bluffton, Clay
- Brazil, Clay
- Byers, Clay
- Carbon, Clay
- Celina, Clay
- Center Point, Clay
- Clay, Clay
- Clay Center, Clay
- Clay Center, Clay
- Clay City, Clay
- Clay City, Clay
- Claycomo, Clay
- Coalmont, Clay
- Corning, Clay
- Dean, Clay
- Delta, Clay
- Dickens, Clay
- Dilworth, Clay
- Edgar, Clay
- Everly, Clay
- Fairfield, Clay
- Felton, Clay
- Fleming Island, Clay
- Flora, Clay
- Fort Gaines, Clay
- Fostoria, Clay
- Georgetown, Clay
- Gladstone, Clay
- Glenaire, Clay
- Glenvil, Clay
- Glyndon, Clay
- Green, Clay
- Green Cove Springs, Clay
- Greenway, Clay
- Harmony, Clay
- Harvard, Clay
- Hawley, Clay
- Hayesville, Clay
- Henrietta, Clay
- Hitterdal, Clay
- Hollins, Clay
- Holt, Clay
- Independence, Clay
- Iola, Clay
- Jolly, Clay
- Kansas City, Clay
- Kearney, Clay
- Keystone Heights, Clay
- Knightsville, Clay
- Knobel, Clay
- Lakeside, Clay
- Liberty, Clay
- Lineville, Clay
- Louisville, Clay
- Manchester, Clay
- McDougal, Clay
- Middleburg, Clay
- Millerville, Clay
- Missouri City, Clay
- Moorhead, Clay
- Morganville, Clay
- Mosby, Clay
- North Kansas City, Clay
- Oakleaf Plantation, Clay
- Oakport, Clay
- Oaks, Clay
- Oakview, Clay
- Oakwood, Clay
- Oakwood Park, Clay
- Oneida, Clay
- Orange Park, Clay
- Peach Orchard, Clay
- Penney Farms, Clay
- Peterson, Clay
- Petrolia, Clay
- Piggott, Clay
- Pleasant Valley, Clay
- Pollard, Clay
- Prathersville, Clay
- Rector, Clay
- Royal, Clay
- Sabin, Clay
- Smithville, Clay
- Spencer, Clay
- St. Francis, Clay
- Staunton, Clay
- Success, Clay
- Sugar Creek, Clay
- Sutton, Clay
- Ulen, Clay
- Vermillion, Clay
- Wakefield, Clay
- Wakonda, Clay
- Webb, Clay
- West Point, Clay
- Xenia, Clay