| 1 | Mount Water Well Drilling | 116 | 324 | 3,547 |
| 2 | Warthman Drilling Inc. | 71 | 345 | 4,411 |
| 3 | Keen Well And Pump | 50 | 174 | 10,231 |
| 4 | Bapst Inc. | 33 | 66 | 5,348 |
| 5 | B Mowrey Drilling LLC | 24 | 26 | 89 |
| 6 | Hurley's Water Well Drilling | 18 | 36 | 802 |
| 7 | Smith's Well Drilling LLC | 12 | 80 | 1,966 |
| 8 | Gard's Water Well Drilling | 5 | 19 | 160 |
| 9 | Jamison Well Drilling Inc. | 5 | 5 | 11,219 |
| 10 | Central Soft Water | 5 | 5 | 1,489 |
| 11 | K & B Well Drilling Co. | 3 | 6 | 1,837 |
| 12 | Dean's Drilling | 2 | 23 | 1,010 |
| 13 | Beinhower Bros Drilling Co. | 2 | 22 | 3,766 |
| 14 | Aqua Drilling Inc. | 2 | 16 | 430 |
| 15 | Ramsey Drilling | 1 | 43 | 614 |
| 16 | J E Wright Well Drilling | 1 | 14 | 1,126 |
| 17 | Yoder Drilling & Geothermal | 1 | 1 | 1,353 |
| 18 | Flinner Drilling Inc. | 1 | 1 | 8,459 |
| 19 | American Drilling & Pump Service | 1 | 1 | 357 |
| 20 | Cantrell Well Drilling | 1 | 1 | 477 |
| 21 | A & H Bevard Water Well Service | 1 | 1 | 44 |
| 22 | Harley (V J) And Son | — | 186 | 236 |
| 23 | Knisley Well Drilling | — | 182 | 202 |
| 24 | Peck (Carl) Well Drilling | — | 137 | 412 |
| 25 | Morgan Well Drilling | — | 133 | 147 |
| 26 | Ross Water Well Drilling | — | 123 | 544 |
| 27 | Swingle (Donald) Well Drilling | — | 120 | 364 |
| 28 | Miller (Floyd) Well Drilling | — | 98 | 126 |
| 29 | Alliance Water Well Inc. | — | 89 | 458 |
| 30 | Peck Well Drilling | — | 83 | 333 |
| 31 | Helser & Sons Water Well Drilling | — | 78 | 121 |
| 32 | Melick (W O) | — | 76 | 124 |
| 33 | Anders Drilling | — | 73 | 219 |
| 34 | T C Drilling | — | 66 | 70 |
| 35 | Allen Water Well Drilling | — | 62 | 96 |
| 36 | Leindecker Well Drilling | — | 50 | 796 |
| 37 | Mike's Water Well Drilling | — | 39 | 175 |
| 38 | Mcgee Drilling | — | 36 | 56 |
| 39 | R C Barry Company | — | 35 | 3,818 |
| 40 | Kellenbarger & Sons Drilling | — | 34 | 412 |
| 41 | Filkill Water Well Drilling | — | 31 | 318 |
| 42 | Vickroy Well Drilling | — | 31 | 260 |
| 43 | C & L Water Well Drilling | — | 28 | 47 |
| 44 | Suburban Drilling Co. | — | 27 | 246 |
| 45 | Ranger Drilling | — | 27 | 31 |
| 46 | Casey's Well Drilling | — | 24 | 312 |
| 47 | Perry Water Well Drilling | — | 23 | 102 |
| 48 | Fouts Drilling | — | 23 | 61 |
| 49 | Professional Water Well Systems | — | 21 | 624 |
| 50 | Anderson Water Well Drilling | — | 16 | 92 |
| 51 | Sprowls Drilling Co. | — | 14 | 1,348 |
| 52 | Terry & Sons Water Well Drilling | — | 14 | 29 |
| 53 | Christy (Joe) | — | 13 | 692 |
| 54 | Markle Drilling | — | 13 | 199 |
| 55 | B & B Well Drilling | — | 13 | 134 |
| 56 | Marsh II Drilling | — | 13 | 133 |
| 57 | Riser Frank Drilling | — | 13 | 42 |
| 58 | Hatfield (R A) & Son Inc. | — | 12 | 243 |
| 59 | Barry (R C) | — | 11 | 1,392 |
| 60 | Sarbaugh Drilling | — | 11 | 475 |
| 61 | Poole's Water Well Drilling | — | 11 | 293 |
| 62 | Ferguson (Terry) Drilling | — | 11 | 34 |
| 63 | Wilson (Vance) Well Drilling | — | 10 | 181 |
| 64 | Snedden (Frank) & Sons | — | 10 | 34 |
| 65 | Wilson (Jim) Well Drilling | — | 9 | 1,464 |
| 66 | Buckeye Valley Well Drilling | — | 9 | 721 |
| 67 | Poling Drilling | — | 9 | 485 |
| 68 | Brown Drilling | — | 9 | 152 |
| 69 | Keen Drilling | — | 8 | 436 |
| 70 | H E Peck Drilling | — | 8 | 376 |
| 71 | Hoover Well Drilling | — | 8 | 173 |
| 72 | Price (Dwight E) | — | 8 | 161 |
| 73 | Easterling (D L) | — | 8 | 138 |
| 74 | H & A Water Well Drlg & Pump Svc | — | 8 | 106 |
| 75 | Riser (H E) | — | 8 | 56 |
| 76 | Gobel Well Drilling | — | 7 | 1,184 |
| 77 | Vollmuth (Raymond A) | — | 7 | 946 |
| 78 | Danny's Water Well Drilling | — | 7 | 379 |
| 79 | Robert Davis Well Drilling | — | 7 | 377 |
| 80 | Bohn Bros Well Drilling | — | 7 | 221 |
| 81 | Miller Drilling | — | 7 | 59 |
| 82 | Gobel (Roger L) | — | 7 | 35 |
| 83 | R & C Drilling Co. | — | 7 | 34 |
| 84 | Blair Drilling & Pump Serv LLC | — | 6 | 593 |
| 85 | Smith (R) Water Well Drilling | — | 6 | 190 |
| 86 | Scheideggers Pump Service | — | 6 | 76 |
| 87 | Anderson Drilling & Pump Inc. | — | 5 | 2,933 |
| 88 | Short Drilling | — | 5 | 1,580 |
| 89 | J & O Drilling | — | 5 | 399 |
| 90 | Shamrock Drilling | — | 5 | 315 |
| 91 | Acme Drilling Co. | — | 5 | 38 |
| 92 | Hoffman's Water Well Service | — | 5 | 30 |
| 93 | Jackson & Sons Drilling & Pump Co. | — | 4 | 3,154 |
| 94 | Dan Allen Well Drilling | — | 4 | 493 |
| 95 | Larry Bevard Water Well Drilling | — | 4 | 187 |
| 96 | Doug Frost Drilling | — | 4 | 118 |
| 97 | Snider Drilling Co. | — | 4 | 31 |
| 98 | Mckee Well Drilling | — | 4 | 25 |
| 99 | Quinter Well Drilling LLC | — | 3 | 12,078 |
| 100 | Stage Inc. (Dba R C Barry) | — | 3 | 1,117 |
| 101 | Agua Well Drilling Inc. | — | 3 | 449 |
| 102 | G M Baker & Son | — | 3 | 259 |
| 103 | Charles Allen Water Well Drilling | — | 3 | 235 |
| 104 | Jordan (Emmett M) | — | 3 | 204 |
| 105 | Miller (Clay E) | — | 3 | 122 |
| 106 | Ricketts & Co. | — | 3 | 83 |
| 107 | Lemon (Chester) & Son | — | 3 | 79 |
| 108 | Edwards (Fred) | — | 3 | 70 |
| 109 | Glen T Speedy Drilling | — | 3 | 32 |
| 110 | Speedy Drilling Co. | — | 2 | 2,142 |
| 111 | Had Inc. | — | 2 | 783 |
| 112 | Sever Water Well Drilling | — | 2 | 4,250 |
| 113 | Paul W Wright Drilling | — | 2 | 1,236 |
| 114 | Ellis & Morris Drilling Co. | — | 2 | 539 |
| 115 | Snedden (E J) Well Drilling | — | 2 | 456 |
| 116 | Bauer Well Drilling | — | 2 | 393 |
| 117 | Frazier Drilling | — | 2 | 376 |
| 118 | Pataskala Well Drilling | — | 2 | 362 |
| 119 | Lupher Drilling | — | 2 | 295 |
| 120 | Reynolds Inc. | — | 2 | 186 |
| 121 | Chas Hoover Well Drilling | — | 2 | 180 |
| 122 | Lancaster Well Service | — | 2 | 179 |
| 123 | Stewart Well Drilling | — | 2 | 177 |
| 124 | Central Ohio Drilling | — | 2 | 169 |
| 125 | Whitesed (D L) & Son Drilling | — | 2 | 145 |
| 126 | Michel Water Well Drilling | — | 2 | 141 |
| 127 | Applegate (G D) | — | 2 | 88 |
| 128 | James R Moran Drilling Co. | — | 2 | 82 |
| 129 | Spung's Well Drilling | — | 2 | 80 |
| 130 | Combs (John O) | — | 2 | 74 |
| 131 | Reinschell (Lowell) Drilling | — | 2 | 66 |
| 132 | Mullins Well Drilling | — | 2 | 60 |
| 133 | Campbell (Robert) | — | 2 | 30 |
| 134 | Don Burrows Well Drilling | — | 1 | 514 |
| 135 | Moody's OF Dayton Inc. | — | 1 | 361 |
| 136 | Tedrow Water Well Drilling | — | 1 | 577 |
| 137 | Steve Nethers Drilling | — | 1 | 151 |
| 138 | Mcbride Drilling Co. | — | 1 | 744 |
| 139 | J R Wells Water Well Drilling | — | 1 | 520 |
| 140 | Frost Drilling | — | 1 | 386 |
| 141 | S & N Berea Drilling Co. | — | 1 | 331 |
| 142 | Parks Well Drilling | — | 1 | 283 |
| 143 | Garrabrant Well Drilling | — | 1 | 279 |
| 144 | B E Wright Drilling | — | 1 | 260 |
| 145 | Blauser (Grover C) | — | 1 | 247 |
| 146 | Treadway (Gerald) Well Drilling | — | 1 | 225 |
| 147 | Benjamin (C B) | — | 1 | 213 |
| 148 | Cave Well Drilling | — | 1 | 204 |
| 149 | Water Systems Inc. | — | 1 | 196 |
| 150 | Wheeler Drilling Co. | — | 1 | 122 |
| 151 | Hart's Water Well Drilling | — | 1 | 118 |
| 152 | R & J Well Drilling (Randy) | — | 1 | 94 |
| 153 | Pete Clepper Well Drilling | — | 1 | 91 |
| 154 | Phillips Water Well Drilling | — | 1 | 90 |
| 155 | Flanagan Drilling | — | 1 | 88 |
| 156 | Burfield Brothers | — | 1 | 69 |
| 157 | Denman Water Well Drilling | — | 1 | 49 |
| 158 | Dean Drilling | — | 1 | 45 |
| 159 | Mcdaniel Well Drilling | — | 1 | 35 |
| 160 | Sater Well Drilling | — | 1 | 33 |
| 161 | Chuck Mock Water Well Drilling | — | 1 | 33 |