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Stone description: porous
| Wall Number | Country | State | Classification | Source Sort descending |
|---|---|---|---|---|
| 13LA5 | United States | Wisconsin | Dolomite | La Crosse |
| 10LB20 | United States | Ohio | Sandstone | Lancaster |
| 9LA21 | United States | Ohio | Sandstone | Lancaster |
| 11RB15 | United States | Iowa | Dolomite | Lansing |
| 9Lb44 | United States | Wyoming | Sandstone | Laramie |
| 26WE | United States | Wyoming | Sandstone | Laramie |
| S2-1 | United States | Wyoming | Sandstone | Laramie |
| S2-126 | United States | Wyoming | Sandstone | Laramie |
| 7RA44 | United States | New Mexico | Sandstone | Las Vegas |
| 11RB45 | United States | New Mexico | Sandstone | Las Vegas |
| 8La47 | United States | New Mexico | Sandstone | Las Vegas |
| 11C | United States | Indiana | Limestone | Lawrence Co. |
| 5C | United States | Indiana | Limestone | Lawrence Co. |
| 6RA11 | United States | Pennsylvania | Sandstone | Layton Station Fayette Co. |
| 5RA16 | United States | Ohio | Sandstone | Leesville |
| 13LB29 | Italy | Limestone | Leghorn | |
| 11LB26 | United States | Iowa | Sandstone | Lewis |
| 5RA7 | United States | Ohio | Sandstone | Lewis Mills |
| 12RA13 | United States | Ohio | Dolomite | Lima |
| 10LA11 | United States | Ohio | Dolomite | Lima |
| 5LB27 | Austria | Conglomerate | Lindabrunn | |
| 5RA11 | United States | Ohio | Sandstone | Lithopolis |
| 8RB39 | United States | New Jersey | Sandstone | Little Falls |
| 7LB29 | United States | California | Sandstone | Livermore |
| 6La30 | United States | Kentucky | Sandstone | Livingstone |
| 9LA22 | United States | Ohio | Sandstone | Logan |
| 8RA33 | United States | Colorado | Sandstone | Longmont |
| 11LA33 | United States | Ohio | Limestone | Lumberton |
| 8RB16 | United States | Wisconsin | Limestone | Madison |
| 11RB29 | United States | Virginia | Sandstone | Manassas |
| 8LB35 | United States | Connecticut | Sandstone | Manchester |
| 13RA7 | United States | Minnesota | Dolomite | Mankato |
| 7RA7 | Hungary | Limestone | Mannersdorf | |
| 5RA19 | United States | Ohio | Sandstone | Mansfield |
| 9LB22 | United States | Ohio | Sandstone | Mansfield |
| 12LA16 | United States | Iowa | Dolomite | Maquoketa |
| 7RA5 | Hungary | Limestone | Margarethen Leitha Mts. | |
| 14LA37 | Hungary | Limestone | Margarethen Leitha Mts. | |
| 13LA36 | Hungary | Limestone | Margarethen Leitha Mts. | |
| 7LA4 | Hungary | Limestone | Margarethen Leitha Mts. | |
| 14LB37 | Hungary | Limestone | Margarethen Leitha Mts. | |
| 14RA38 | Hungary | Limestone | Margarethen Leitha Mts. | |
| 7LB9 | Hungary | Limestone | Margarethen Leitha Mts. | |
| 7RB25 | United States | New York | Sandstone | Margarettville |
| 5RA5 | United States | Ohio | Sandstone | Marietta |
| 5RA13 | United States | Ohio | Sandstone | Marietta |
| 6RB21 | United States | Ohio | Sandstone | Marietta |
| 9LB23 | United States | Ohio | Sandstone | Marietta |
| 10La9 | United States | Kansas | Dolomite | Marion Center |
| 11RB9 | United States | Kansas | Dolomite | Marion Center |
| 7RA42 | United States | Michigan | Sandstone | Marquette |
| 7RB42 | United States | Michigan | Sandstone | Marquette |
| 10LA18 | United States | Iowa | Limestone | Marshalltown |
| 5RA1 | United States | Ohio | Sandstone | Massillon |
| 10Lb46 | United States | Wisconsin | Sandstone | Mauston |
| 10Lb47 | United States | Wisconsin | Sandstone | Mauston |
| 9LA36 | United States | New Jersey | Conglomerate | May's Landing Atlantic Co. |
| 6RQ | United States | Ohio | Sandstone | McDermont |
| 8RQ | United States | Ohio | Sandstone | McDermont |
| 17WE | United States | Ohio | Sandstone | McDermott |
| 18WE | United States | Ohio | Sandstone | McDermott |
| 19WE | United States | Ohio | Sandstone | McDermott |
| 13WE | United States | Ohio | Sandstone | McDermott |
| 22EE | United States | Ohio | Sandstone | McDermott |
| 7EE | United States | Ohio | Sandstone | McDermott |
| 9WE | United States | Ohio | Sandstone | McDermott |
| S1-1 | United States | Ohio | Sandstone | McDermott |
| S1-2 | United States | Ohio | Sandstone | McDermott |
| 12WE | United States | Ohio | Sandstone | McDermott |
| 28EE | United States | Ohio | Sandstone | McDermott |
| 6EE | United States | Ohio | Sandstone | McDermott |
| S2-10 | United States | Ohio | Sandstone | McDermott |
| S2-7 | United States | Ohio | Sandstone | McDermott |
| S3-11 | United States | Ohio | Sandstone | McDermott |
| S3-6 | United States | Ohio | Sandstone | McDermott |
| 9RB32 | United States | Missouri | Sandstone | Meadville |
| 9RA18 | United States | Pennsylvania | Sandstone | Meadville |
| 10RB29 | United States | New York | Sandstone | Medina |
| 8LB34 | United States | Minnesota | Sandstone | Mendota |
| 10LA38 | Mexico | Dacite | Mexico State | |
| 13RA22 | United States | Missouri | Sandstone | Miami Station Carroll Co. |
| 8RB20 | United States | Ohio | Sandstone | Middleburg Twp. Cuyahoga Co. |
| 6LB21 | United States | Ohio | Sandstone | Millersburg |
| 5LA7 | United States | Ohio | Sandstone | Millersburg |
| 7RB30 | United States | Texas | Sandstone | Milsap |
| 8RA32 | United States | Texas | Sandstone | Milsap |
| 9RA21 | United States | Ohio | Sandstone | Monclava |
| 6La13 | United States | Pennsylvania | Sandstone | Monongahela City |
| 10RB31 | United States | Texas | Sandstone | Mormon Mills |
| 9RA3 | United States | Colorado | Limestone | Morrison |
| 8RA26 | United States | North Carolina | Sandstone | Morrisville |
| 5LA19 | United States | Ohio | Sandstone | Mt. Gilead |
| 5LA1 | United States | Ohio | Sandstone | Mt. Gilead |
| 14LA14 | United States | Iowa | Dolomite | Mt. Vernon |
| 13RA35 | Spain | Limestone | Murcia, Murcia | |
| 5LB1 | United States | Ohio | Sandstone | N. Hampton |
| 8RB36 | Scotland | Sandstone | Nairn | |
| 9RB38 | United States | Oregon | Sandstone | Near Albany |
| 8RA36 | United States | Missouri | Sandstone | Nevada |
| 5LA13 | United States | Ohio | Sandstone | New Lisbon |