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Stone description: gray
| Wall Number | Country | State | Classification | Source Sort ascending |
|---|---|---|---|---|
| 14RA31 | Austria | Marble | Karst | |
| 12LA14 | United States | Missouri | Limestone | Kansas City |
| 7RB23 | United States | Maine | Gneiss | Jefferson |
| 5LB20 | United States | North Carolina | Gneiss | Jamestown |
| 11RB33 | United States | Oregon | Sandstone | Jacksonville |
| 13LB42 | United States | Illinois | Limestone | Iuka |
| 8B | United States | Minnesota | Granite | Isle |
| 14LB26 | United States | Kansas | Limestone | Irving |
| 10LA20 | United States | Iowa | Limestone | Iowa Falls |
| 9RA12 | United States | Iowa | Limestone | Iowa City |
| 12RB7 | United States | New York | Limestone | Indian Res. Onondaga Co. |
| 5RB8 | United States | Ohio | Sandstone | Independence |
| 9RB23 | United States | Maine | Granite | Hurricane Isl. |
| 13RA13 | United States | Iowa | Dolomite | Humbolt |
| 10RA47 | United States | Tennessee | Syenite | Hiwasee copper mines |
| 11LB42 | United States | North Carolina | Gneiss | Hickory |
| 7RA40 | United States | Montana | Diorite | Helena |
| 10LB43 | United States | New Hampshire | Granite | Hanover |
| 1L6 | Canada | Granite | Halifax Co. | |
| 10RB40 | United States | Maryland | Granite | Gwynn Falls |
| 6LA37 | United States | Connecticut | Granite | Groton |
| 9LB36 | United States | Alabama | Sandstone | Greensport |
| 6RA17 | United States | Pennsylvania | Sandstone | Greensburgh |
| 5LA21 | United States | North Carolina | Gneiss | Greensborough |
| 8RB23 | United States | North Carolina | Granite | Greensborough |
| 5RA8 | United States | Ohio | Sandstone | Greenfield |
| 8La19 | United States | Pennsylvania | Diabase | Goldsboro |
| 5LB16 | United States | Massachusetts | Granite | Gloucester |
| 5LB18 | United States | Massachusetts | Granite | Gloucester |
| 9RB11 | United States | Iowa | Limestone | Givin |
| 6LB16 | United States | Pennsylvania | Diabase | Gettysburg |
| 6rb32 | United States | Colorado | Granite | Georgetown |
| 7RA23 | United States | North Carolina | Granite | Gastonia |
| 6RA36 | United States | Connecticut | Gneiss | Gastonbury |
| 6RA38 | United States | North Carolina | Granite | Gaston Co. |
| S2-133 | United States | Montana | Marble | Gardner |
| 8RA2 | Portugal | Limestone | Freguesias, Coimbra | |
| 6RB2 | United States | Pennsylvania | Sandstone | Franklin |
| 6RB27 | United States | Maine | Granite | Franklin |
| 5LA25 | United States | Maine | Granite | Frankfort |
| 6LB27 | United States | Maine | Granite | Frankfort |
| 16B | United States | Maine | Granite | Frankfort |
| S2-51 | United States | Maine | Granite | Frankfort |
| 9Lb37 | United States | Oregon | Sandstone | Forest Grove |
| 10RA36 | United States | New Hampshire | Granite | Fitzwilliams |
| 10RA38 | United States | New Hampshire | Granite | Fitzwilliams |
| 10LA46 | United States | New Hampshire | Granite | Fitzwilliams |
| 5LB10 | United States | Massachusetts | Granite | Fitchburg |
| 4LB21 | United States | Massachusetts | Granite | Fitchburg |
| 10LA13 | United States | Maryland | Dolomite | Findlay |
| 10RA41 | United States | New Hampshire | Granite | Farmington |
| 5RB41 | United States | South Carolina | Granite | Fairfield Co. |
| 5LB40 | United States | South Carolina | Granite | Fairfield Co. |
| 9LB14 | United States | Iowa | Limestone | Fairfield |
| 5RA12 | United States | Ohio | Sandstone | Euclid |
| 11RB36 | United States | New Hampshire | Granite | Enfield |
| 7RA20 | United States | Ohio | Sandstone | Elyria |
| 6LB41 | United States | South Carolina | Granite | Edgefield Co. |
| 9LB12 | United States | Iowa | Limestone | Earlham |
| 6LB34 | United States | Minnesota | Granite | E. St. Cloud |
| 6LB36 | United States | Connecticut | Granite | E. Canaan |
| 10RB27 | United States | Maine | Granite | E. Blue Hill |
| 10RB44 | United States | New Hampshire | Granite | Durham |
| 14LB22 | United States | Iowa | Limestone | Dudley Sta. Wapello Co. |
| 7RA32 | United States | Minnesota | Sandstone | Dresback |
| 10La32 | United States | Maine | Granite | Dix Island |
| S2-93 | United States | Vermont | Granite | Derby |
| 5LB23 | United States | North Carolina | Granite | Davidson College |
| 14LB28 | United States | Tennessee | Limestone | Davidson Co. |
| 5RB6 | United States | Ohio | Sandstone | Cumberland |
| 10RB18 | United States | Virginia | Marble | Craigsville |
| 13LB27 | United States | Tennessee | Limestone | Cowan |
| 11RA8 | United States | Pennsylvania | Limestone | Cove Statioan Bedford Co. |
| S2-125 | United States | Kansas | Limestone | Cottonwood |
| 5LB28 | United States | California | Tuff | Cordelia |
| S2-77 | United States | New Hampshire | Granite | Concord |
| S2-80 | United States | New Hampshire | Granite | Concord |
| 10LA44 | United States | New Hampshire | Granite | Concord |
| S2-48 | United States | New Hampshire | Granite | Concord |
| 5LB43 | United States | New Hampshire | Granite | Concord |
| 5Lb44 | United States | New Hampshire | Granite | Concord |
| S2-76 | United States | New Hampshire | Granite | Concord |
| 5LA14 | United States | Ohio | Sandstone | Columbus |
| S2-142 | United States | California | Marble | Columbia |
| S2-143 | United States | California | Marble | Columbia |
| 5RB40 | United States | South Carolina | Granite | Columbia |
| 11LB43 | Canada | Sandstone | Cliffton, New Brunswick | |
| 8RA42 | United States | Oregon | Basalt | Clackamas Station Clackamas Co |
| 14RB3 | United States | Illinois | Dolomite | Chicago |
| 6RA26 | United States | Maine | Granite | Chesterville |
| 13RB40 | United States | Illinois | Limestone | Chester |
| 7Lb18 | United States | Pennsylvania | Gneiss | Chester |
| 12RB30 | United States | New York | Marble | Chazy |
| 6LB24 | United States | North Carolina | Granite | Charlotte |
| 8LB26 | United States | North Carolina | Granite | Charlotte |
| 8RA39 | United States | West Virginia | Sandstone | Charleston |
| 5LB39 | United States | South Carolina | Granite | Charleston |
| 11La14 | United States | Iowa | Limestone | Charles City |
| 6RB4 | United States | Pennsylvania | Sandstone | Center Bridge |
| 12LB16 | United States | Iowa | Dolomite | Cedar Falls |