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Stone description: porous
| Wall Number | Country | State | Classification | Source Sort ascending |
|---|---|---|---|---|
| 5LA18 | United States | Ohio | Sandstone | Plymouth |
| 6LA43 | United States | New Jersey | Sandstone | Pleasant Val. |
| 7LB39 | United States | New Jersey | Sandstone | Pleasant Val. |
| 9LA40 | United States | Illinois | Sandstone | Pinckneyville |
| 5LA5 | United States | Ohio | Sandstone | Piketon |
| 5LA9 | United States | Ohio | Sandstone | Piketon |
| 5LA3 | United States | Ohio | Sandstone | Peninsula |
| 11LB31 | United States | Kansas | Sandstone | Pawnee |
| 7LA39 | United States | New Jersey | Sandstone | Patterson |
| 10RA31 | United States | Kansas | Sandstone | Parsons |
| 10RA32 | United States | Kansas | Sandstone | Parsons |
| 11La38 | United States | Tennessee | Sandstone | Parksville |
| 9RB39 | United States | Indiana | Sandstone | Paoli |
| 8RB45 | United States | Wisconsin | Sandstone | Packwaukee |
| 14LA38 | Hungary | Limestone | Oszlopp | |
| 8LA39 | United States | Kansas | Sandstone | Oswego |
| 12LB14 | United States | Missouri | Dolomite | Osage |
| 7LA40 | United States | New Jersey | Sandstone | Orange Mt. |
| 6LB3 | United States | Pennsylvania | Sandstone | Oil City |
| 6RB37 | Mexico | Tuff | Oaxaca State | |
| 5La2 | United States | Ohio | Sandstone | Norwalk |
| 5LA4 | United States | Ohio | Sandstone | Norwalk |
| 6LB12 | United States | Pennsylvania | Sandstone | Norristown |
| 8RA4 | United States | Tennessee | Limestone | Nolensville Pike |
| 5LB2 | United States | Ohio | Sandstone | Newburgh |
| 5LB5 | United States | Ohio | Sandstone | Newburgh |
| 8LA42 | United States | New Jersey | Sandstone | Newark |
| 9RA22 | United States | Ohio | Sandstone | Newark |
| 5LB6 | United States | Ohio | Sandstone | Newark |
| 7LB40 | United States | New Jersey | Sandstone | Newark |
| 6LA20 | United States | Ohio | Sandstone | Newark |
| 9RB24 | Australia | Sandstone | New South Wales | |
| 9LB26 | Australia | Sandstone | New South Wales | |
| 9RB25 | Australia | Sandstone | New South Wales | |
| 9LB27 | Australia | Sandstone | New South Wales | |
| 9RA26 | Australia | Sandstone | New South Wales | |
| 9LA27 | Australia | Sandstone | New South Wales | |
| 4L7 | Australia | Sandstone | New South Wales | |
| 4L8 | Australia | Sandstone | New South Wales | |
| 4R7 | Australia | Sandstone | New South Wales | |
| 4R8 | Australia | Sandstone | New South Wales | |
| 5LB4 | United States | Ohio | Sandstone | New Philadelphia |
| 5LA13 | United States | Ohio | Sandstone | New Lisbon |
| 8RA36 | United States | Missouri | Sandstone | Nevada |
| 9RB38 | United States | Oregon | Sandstone | Near Albany |
| 8RB36 | Scotland | Sandstone | Nairn | |
| 5LB1 | United States | Ohio | Sandstone | N. Hampton |
| 13RA35 | Spain | Limestone | Murcia, Murcia | |
| 14LA14 | United States | Iowa | Dolomite | Mt. Vernon |
| 5LA1 | United States | Ohio | Sandstone | Mt. Gilead |
| 5LA19 | United States | Ohio | Sandstone | Mt. Gilead |
| 8RA26 | United States | North Carolina | Sandstone | Morrisville |
| 9RA3 | United States | Colorado | Limestone | Morrison |
| 10RB31 | United States | Texas | Sandstone | Mormon Mills |
| 6La13 | United States | Pennsylvania | Sandstone | Monongahela City |
| 9RA21 | United States | Ohio | Sandstone | Monclava |
| 7RB30 | United States | Texas | Sandstone | Milsap |
| 8RA32 | United States | Texas | Sandstone | Milsap |
| 6LB21 | United States | Ohio | Sandstone | Millersburg |
| 5LA7 | United States | Ohio | Sandstone | Millersburg |
| 8RB20 | United States | Ohio | Sandstone | Middleburg Twp. Cuyahoga Co. |
| 13RA22 | United States | Missouri | Sandstone | Miami Station Carroll Co. |
| 10LA38 | Mexico | Dacite | Mexico State | |
| 8LB34 | United States | Minnesota | Sandstone | Mendota |
| 10RB29 | United States | New York | Sandstone | Medina |
| 9RB32 | United States | Missouri | Sandstone | Meadville |
| 9RA18 | United States | Pennsylvania | Sandstone | Meadville |
| 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 |
| 28EE | United States | Ohio | Sandstone | McDermott |
| S1-2 | United States | Ohio | Sandstone | McDermott |
| 12WE | 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 |
| 6RQ | United States | Ohio | Sandstone | McDermont |
| 8RQ | United States | Ohio | Sandstone | McDermont |
| 9LA36 | United States | New Jersey | Conglomerate | May's Landing Atlantic Co. |
| 10Lb46 | United States | Wisconsin | Sandstone | Mauston |
| 10Lb47 | United States | Wisconsin | Sandstone | Mauston |
| 5RA1 | United States | Ohio | Sandstone | Massillon |
| 10LA18 | United States | Iowa | Limestone | Marshalltown |
| 7RA42 | United States | Michigan | Sandstone | Marquette |
| 7RB42 | United States | Michigan | Sandstone | Marquette |
| 11RB9 | United States | Kansas | Dolomite | Marion Center |
| 10La9 | United States | Kansas | Dolomite | Marion Center |
| 5RA13 | United States | Ohio | Sandstone | Marietta |
| 6RB21 | United States | Ohio | Sandstone | Marietta |
| 9LB23 | United States | Ohio | Sandstone | Marietta |
| 5RA5 | United States | Ohio | Sandstone | Marietta |
| 7RB25 | United States | New York | Sandstone | Margarettville |
| 7LB9 | Hungary | Limestone | Margarethen Leitha Mts. |