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Stone description: porous
| Wall Number | Country | State | Classification | Source Sort descending |
|---|---|---|---|---|
| 6LB20 | United States | Ohio | Sandstone | Sunbury |
| 9LA44 | United States | Florida | Sandstone | Suwannee River |
| 9LB43 | United States | Washington | Sandstone | Tenino |
| 8RB46 | United States | Washington | Sandstone | Tenino |
| 8LB36 | Scotland | Sandstone | Thurso | |
| 14LB12 | United States | Ohio | Dolomite | Tiffin |
| 14RA12 | United States | Ohio | Dolomite | Tiffin |
| 6La16 | United States | Pennsylvania | Sandstone | Titusville |
| 9RA9 | United States | Iowa | Limestone | Tracey Station, Marion Co. |
| 12RB40 | United States | Alabama | Limestone | Turks Cave |
| 9LB21 | United States | Ohio | Sandstone | Twinsburg |
| 9RA20 | United States | Pennsylvania | Sandstone | Uniontown |
| 6LA47 | United States | Louisiana | Sandstone | Unknown |
| 8LB47 | United States | New Mexico | Sandstone | Valencia Co. |
| 10RA14 | United States | Ohio | Dolomite | Van Wert |
| 13RA18 | United States | Iowa | Limestone | Vinton |
| 8LA26 | United States | North Carolina | Sandstone | Wadesboro |
| 6LA3 | United States | Pennsylvania | Sandstone | Wampum |
| 6La4 | United States | Pennsylvania | Sandstone | Wampum |
| 10RB22 | United States | Ohio | Sandstone | Warren |
| 8LA37 | United States | Missouri | Sandstone | Warrensburg |
| 6LA21 | United States | Ohio | Sandstone | Warwick |
| 6LA15 | United States | Pennsylvania | Sandstone | Washington |
| 6La9 | United States | Pennsylvania | Sandstone | Waynesburgh |
| 5LA6 | United States | Ohio | Sandstone | Weller Twp. Richland Co. |
| 8LB39 | United States | West Virginia | Sandstone | Wheeling |
| 10RA13 | United States | Ohio | Dolomite | White House |
| 10RA15 | United States | Ohio | Dolomite | White House |
| 11LB45 | United States | Kentucky | Sandstone | Whitney Co. |
| 6RA30 | United States | Kentucky | Sandstone | Whitney Co. |
| 9LB41 | United States | Indiana | Sandstone | Williamsport |
| 5LA11 | United States | Ohio | Sandstone | Windham |
| 5LA16 | United States | Ohio | Sandstone | Windsor |
| 14RA15 | United States | Iowa | Dolomite | Winterset |
| 5La17 | United States | Ohio | Sandstone | Wooster |
| 9RA42 | United States | Illinois | Sandstone | Xenia |
| 6LB7 | United States | Pennsylvania | Sandstone | Yardleyville |
| 8LB38 | United States | Arizona | Sandstone | Yavapai Co. |
| 14LA12 | United States | Ohio | Dolomite | Yellow Springs |
| 6LB39 | United States | Ohio | Sandstone | Youngstown |
| 5La8 | United States | Ohio | Sandstone | Youngstown |
| 5Lb3 | United States | Ohio | Sandstone | Zanesville |