| 1 | Davidson Well Drilling | 504 | 1,751 | 3,177 |
| 2 | Jamison Well Drilling Inc. | 493 | 854 | 11,219 |
| 3 | Carroll's Well Drilling | 390 | 1,235 | 2,028 |
| 4 | Keen Well And Pump | 191 | 449 | 10,231 |
| 5 | A W Smith Well Drilling | 141 | 517 | 1,041 |
| 6 | Greg Rogers Enterprises | 110 | 219 | 446 |
| 7 | Flinner Drilling Inc. | 77 | 288 | 8,459 |
| 8 | Adams & Sons Pump Service Inc. | 68 | 141 | 169 |
| 9 | Central Soft Water | 64 | 64 | 1,489 |
| 10 | Yoder Drilling & Geothermal | 57 | 57 | 1,353 |
| 11 | Griffith Drilling Co. | 56 | 499 | 854 |
| 12 | J Miller & Sons Drilling | 43 | 49 | 1,124 |
| 13 | Cooper Water Well Drilling | 40 | 663 | 2,153 |
| 14 | Williams Drilling Co. | 33 | 46 | 65 |
| 15 | Alexander W Smith Water Well Serv | 26 | 26 | 150 |
| 16 | American Drilling & Pump Service | 18 | 21 | 357 |
| 17 | Donamarc Water Systems Co. | 15 | 1,056 | 2,417 |
| 18 | Quality Water Systems | 14 | 98 | 2,919 |
| 19 | Dillan Well Drilling Inc. | 13 | 21 | 2,861 |
| 20 | Williams (Nick) Drilling | 12 | 281 | 320 |
| 21 | R H Fowler Well Drilling LLC | 12 | 59 | 844 |
| 22 | Pugh (L E) | 11 | 258 | 1,908 |
| 23 | Anderson Drilling & Pump Inc. | 10 | 101 | 2,933 |
| 24 | Arch's Well & Pump Service | 9 | 24 | 313 |
| 25 | Burgess Drilling Inc. | 7 | 80 | 3,562 |
| 26 | Robert E Burrows Well Drilling | 6 | 7 | 1,615 |
| 27 | Pugh Well Drilling | 5 | 412 | 2,961 |
| 28 | Speedy Drilling Co. | 5 | 120 | 2,142 |
| 29 | Civiello Drilling | 5 | 16 | 1,139 |
| 30 | Jackson Well Services Inc. | 5 | 5 | 93 |
| 31 | Southwind Drilling Company | 4 | 22 | 4,282 |
| 32 | Domer Water Services LLC | 4 | 13 | 145 |
| 33 | Had Inc. | 3 | 154 | 783 |
| 34 | Curry Drilling LLC | 3 | 30 | 1,320 |
| 35 | Patriot Drilling | 3 | 22 | 470 |
| 36 | Denny Herr Well Drilling | 3 | 4 | 654 |
| 37 | National Water Services (Lanc) | 3 | 3 | 91 |
| 38 | Flick's Drilling Inc. | 2 | 31 | 355 |
| 39 | Layne Christensen Co. | 2 | 2 | 33 |
| 40 | Williams (Ronald) Drilling Co. | 1 | 452 | 540 |
| 41 | Robert E Smith Drilling | 1 | 152 | 2,483 |
| 42 | Ohio Drilling Company | 1 | 103 | 409 |
| 43 | Depew Well Drilling | 1 | 24 | 2,080 |
| 44 | Hall Drilling | 1 | 14 | 63 |
| 45 | Smitty's Drilling | 1 | 10 | 253 |
| 46 | A & G Well Drilling Inc. | 1 | 3 | 1,010 |
| 47 | Williams Water Well Drilling | 1 | 3 | 679 |
| 48 | Harley Drilling & Pumps Ltd | 1 | 2 | 1,154 |
| 49 | Moody's OF Dayton Inc. | 1 | 1 | 361 |
| 50 | Davis Drilling | 1 | 1 | 415 |
| 51 | Doug Adams Well Drilling | — | 2,146 | 2,323 |
| 52 | R G Stockert Drilling Co. | — | 1,027 | 3,130 |
| 53 | Stoffel Well Drilling | — | 635 | 707 |
| 54 | Freed Water Well Drilling | — | 501 | 1,755 |
| 55 | Jenei Drilling Co. Inc. | — | 462 | 1,390 |
| 56 | Fearon & Feller Inc. | — | 433 | 1,028 |
| 57 | Skolnik (J J) Pump Service | — | 425 | 494 |
| 58 | Culp Drilling Co. | — | 404 | 531 |
| 59 | Palmer Drilling Inc. | — | 397 | 880 |
| 60 | Shetler Well Drilling | — | 367 | 396 |
| 61 | Waltz Everett & Co. Inc. | — | 333 | 1,124 |
| 62 | Quentin Neal Well Drilling | — | 333 | 491 |
| 63 | Bennett Drilling Co. | — | 304 | 1,074 |
| 64 | Rhoades (Paul) | — | 260 | 340 |
| 65 | Waltz (D M) Drilling | — | 223 | 777 |
| 66 | Johnston (Dean L) | — | 201 | 212 |
| 67 | Shoup & Long Well Drilling | — | 188 | 256 |
| 68 | Westfall Well Drilling | — | 160 | 846 |
| 69 | Waltz (Kenneth) & Sons | — | 160 | 195 |
| 70 | Long (T D) Drilling Co. | — | 152 | 189 |
| 71 | Martin (George E) & Son | — | 145 | 148 |
| 72 | Streetsboro Sales & Service | — | 143 | 2,180 |
| 73 | Brogan Well Drilling Co. | — | 140 | 155 |
| 74 | Murphy (R F) | — | 98 | 410 |
| 75 | Mcgill Drilling & Pump | — | 97 | 129 |
| 76 | Kamph's Pump & Well Service | — | 97 | 119 |
| 77 | Mckay & Gould Drilling Inc. | — | 94 | 1,993 |
| 78 | Mid-America Recovery Service | — | 91 | 208 |
| 79 | Spencer (A C) | — | 86 | 386 |
| 80 | James Westfall Well Drilling | — | 85 | 389 |
| 81 | Spencer Drilling Inc. | — | 78 | 261 |
| 82 | Sprowls Drilling Co. | — | 74 | 1,348 |
| 83 | Johnson Hardware Co. | — | 74 | 1,334 |
| 84 | Graham (Parker) | — | 73 | 83 |
| 85 | H L Smith Well Drilling | — | 72 | 180 |
| 86 | Fowler Drilling Inc. | — | 65 | 2,496 |
| 87 | Eddie's Well Drilling | — | 63 | 76 |
| 88 | Quinter Well Drilling LLC | — | 58 | 12,078 |
| 89 | Coventry Well & Pump Service | — | 57 | 519 |
| 90 | Walter's Well Drilling | — | 54 | 1,507 |
| 91 | Mullet Drilling Company Inc. | — | 54 | 2,605 |
| 92 | Rhodes Inc. | — | 52 | 61 |
| 93 | Smith (Gerald) Well Drilling | — | 50 | 456 |
| 94 | H & H Drilling (Alliance) | — | 48 | 136 |
| 95 | Alchier Well Drilling | — | 41 | 849 |
| 96 | Don Smith Well Drilling | — | 41 | 108 |
| 97 | Aultfather Charles Drilling | — | 41 | 105 |
| 98 | Davidson Drilling | — | 37 | 77 |
| 99 | Pittman (Carl F) | — | 35 | 315 |
| 100 | Smith & Sons | — | 34 | 448 |
| 101 | Adams (J E) | — | 33 | 109 |
| 102 | A & A Well Drilling | — | 28 | 237 |
| 103 | Bjaam Environmental Inc. | — | 25 | 156 |
| 104 | Fowler (H C) | — | 25 | 823 |
| 105 | Roth Earth Boring | — | 25 | 231 |
| 106 | William Fait Drilling | — | 23 | 56 |
| 107 | Ruby (Stan) Well Drilling | — | 21 | 750 |
| 108 | Kisner Drilling Co. | — | 20 | 186 |
| 109 | Davis (Carl) | — | 20 | 34 |
| 110 | Stoffer Drilling | — | 20 | 34 |
| 111 | Marion Kornhaus Well Drilling | — | 19 | 565 |
| 112 | Adams Drilling | — | 19 | 30 |
| 113 | Floyd's Water Well Drilling | — | 17 | 65 |
| 114 | Carl Lemon Well Drilling | — | 16 | 163 |
| 115 | Valley Well & Pump Service Inc. | — | 15 | 1,409 |
| 116 | Crowner Drilling Inc. | — | 14 | 1,190 |
| 117 | Mcgill Well Drilling | — | 14 | 128 |
| 118 | Jackson & Sons Drilling & Pump Co. | — | 13 | 3,154 |
| 119 | Frantz Dawson Drilling Co. | — | 10 | 498 |
| 120 | Starkey Water Well Drilling | — | 10 | 32 |
| 121 | Marion Harvey & Co. | — | 9 | 376 |
| 122 | Kisner (J H) | — | 9 | 177 |
| 123 | Hinton Drilling Co. | — | 9 | 165 |
| 124 | Ferguson Drilling | — | 9 | 129 |
| 125 | Mark Hull Drilling | — | 9 | 117 |
| 126 | Smith's Well Drilling LLC | — | 8 | 1,966 |
| 127 | Economy Well Drillers | — | 8 | 1,188 |
| 128 | G & J Drilling | — | 8 | 254 |
| 129 | K & S Well Drilling | — | 8 | 161 |
| 130 | Lemon (Chester) & Son | — | 8 | 79 |
| 131 | Grim Water Systems | — | 8 | 71 |
| 132 | Ohio Rotary Drilling Co. Inc. | — | 8 | 66 |
| 133 | Larry's Well Drilling | — | 8 | 57 |
| 134 | Colwell Drilling | — | 7 | 1,014 |
| 135 | Hull Well Drilling | — | 7 | 426 |
| 136 | Scott (Oakey) Well Drilling | — | 7 | 281 |
| 137 | Holman (Dwight) Drilling | — | 6 | 1,708 |
| 138 | C E Burrows & Sons | — | 6 | 1,701 |
| 139 | Templeton Well Drilling | — | 6 | 1,364 |
| 140 | Smith Drilling Co. Inc. | — | 6 | 988 |
| 141 | Sugarcreek Drilling | — | 6 | 333 |
| 142 | Graham Water Services | — | 5 | 1,347 |
| 143 | Readshaw Well Drilling | — | 5 | 422 |
| 144 | Sheets Machinery | — | 5 | 381 |
| 145 | Edgar Drilling | — | 5 | 143 |
| 146 | J M Drilling | — | 5 | 32 |
| 147 | Dean's Drilling | — | 4 | 1,010 |
| 148 | Robison Drilling | — | 4 | 443 |
| 149 | Frost Drilling | — | 4 | 386 |
| 150 | Layne Ohio (Layne Christensen) | — | 4 | 346 |
| 151 | Hall's Water Well Drilling | — | 4 | 234 |
| 152 | Wolverton (Ken) Well Drilling | — | 4 | 221 |
| 153 | Brown Drilling | — | 4 | 152 |
| 154 | Shoup (Andrew) | — | 4 | 105 |
| 155 | L & R Drilling | — | 4 | 48 |
| 156 | Johnston (H A) | — | 4 | 41 |
| 157 | Ferguson (Terry) Drilling | — | 4 | 34 |
| 158 | Ripley (S Glenn) | — | 4 | 32 |
| 159 | Harper (W H) | — | 4 | 27 |
| 160 | Clearwater Drilling | — | 3 | 44 |
| 161 | Plummer-Mcdannald Drilling | — | 3 | 1,333 |
| 162 | Givens Well Drilling | — | 3 | 576 |
| 163 | Water Systems Inc. | — | 3 | 196 |
| 164 | Burgan Drilling | — | 3 | 129 |
| 165 | Hensel Drilling | — | 3 | 110 |
| 166 | Sprowls Drilling Co. (Groveport) | — | 3 | 84 |
| 167 | Dean Drilling | — | 3 | 45 |
| 168 | Bloo Drilling | — | 3 | 29 |
| 169 | Buckeye Drilling | — | 3 | 29 |
| 170 | Moravy Drilling Inc. | — | 2 | 875 |
| 171 | Jones Drilling | — | 2 | 631 |
| 172 | Newbold (Durward J) | — | 2 | 439 |
| 173 | Fieldman (Herm) | — | 2 | 353 |
| 174 | Hatfield (R A) & Son Inc. | — | 2 | 243 |
| 175 | Unger Well Drilling | — | 2 | 123 |
| 176 | FW Eikleberry & Son | — | 2 | 111 |
| 177 | Fait Drilling | — | 2 | 103 |
| 178 | Scarlott Well Drilling | — | 2 | 94 |
| 179 | Mcintosh Water Well Drilling | — | 2 | 44 |
| 180 | Johnson Excavating | — | 2 | 27 |
| 181 | Fredebaugh Well Drilling | — | 1 | 5,477 |
| 182 | Beinhower Bros Drilling Co. | — | 1 | 3,766 |
| 183 | Hall And Jenkins Well Drilling | — | 1 | 968 |
| 184 | Persing Water Well Drilling | — | 1 | 1,373 |
| 185 | Wayne Drilling | — | 1 | 40 |
| 186 | Landrum Drilling & Pump | — | 1 | 299 |
| 187 | Short Drilling | — | 1 | 1,580 |
| 188 | Wilson (Jim) Well Drilling | — | 1 | 1,464 |
| 189 | Slanker Well Drilling | — | 1 | 794 |
| 190 | Roberts (Willard) Well Drilling | — | 1 | 635 |
| 191 | Smith Drilling Contractors | — | 1 | 609 |
| 192 | Ellis & Morris Drilling Co. | — | 1 | 539 |
| 193 | Rex Drilling Co. | — | 1 | 478 |
| 194 | Urbank Well Drilling | — | 1 | 460 |
| 195 | Shulaw Well Drilling | — | 1 | 425 |
| 196 | Anderson Water Well | — | 1 | 293 |
| 197 | Vanderpool (Herbert) | — | 1 | 272 |
| 198 | Scott (R G) | — | 1 | 247 |
| 199 | Tracy (Hershel) | — | 1 | 197 |
| 200 | Wilson (Vance) Well Drilling | — | 1 | 181 |
| 201 | Sean Speedy Drilling | — | 1 | 167 |
| 202 | Scott Drilling | — | 1 | 135 |
| 203 | Cox Drilling LLC | — | 1 | 131 |
| 204 | Rowan Drilling Co. | — | 1 | 121 |
| 205 | Accurate Well Drilling | — | 1 | 111 |
| 206 | Donley (Walter) | — | 1 | 97 |
| 207 | D & L Drilling LLC (Old) | — | 1 | 88 |
| 208 | Ace Drilling | — | 1 | 88 |
| 209 | Reynolds (B A) | — | 1 | 88 |
| 210 | Dunbar Drilling Co. | — | 1 | 85 |
| 211 | Action Well Drilling | — | 1 | 71 |
| 212 | H & K Drilling | — | 1 | 66 |
| 213 | Morrison (R G) | — | 1 | 59 |
| 214 | Hall's Drilling | — | 1 | 42 |
| 215 | Cap Drilling | — | 1 | 36 |
| 216 | Wilhelm's Drilling Service | — | 1 | 33 |
| 217 | Spencer Associates | — | 1 | 32 |
| 218 | A-1 Well Drilling | — | 1 | 31 |
| 219 | Smith (J M) Water Well Drilling | — | 1 | 30 |
| 220 | Weekley Well Drilling | — | 1 | 29 |
| 221 | Hicks Well Drilling & Pump Service | — | 1 | 27 |
| 222 | Western Reserve Drlg & Equip Co. | — | 1 | 26 |