| 1 | Jamison Well Drilling Inc. | 347 | 503 | 11,219 |
| 2 | Depew Well Drilling | 268 | 1,715 | 2,080 |
| 3 | Keen Well And Pump | 90 | 110 | 10,231 |
| 4 | Central Soft Water | 86 | 86 | 1,489 |
| 5 | Flinner Drilling Inc. | 60 | 453 | 8,459 |
| 6 | Patriot Drilling | 42 | 244 | 470 |
| 7 | Robert E Burrows Well Drilling | 33 | 34 | 1,615 |
| 8 | A W Smith Well Drilling | 27 | 47 | 1,041 |
| 9 | R H Fowler Well Drilling LLC | 26 | 76 | 844 |
| 10 | Landrum Drilling & Pump | 22 | 201 | 299 |
| 11 | Depew (Levi) Well Drilling | 22 | 32 | 173 |
| 12 | Pugh (L E) | 17 | 54 | 1,908 |
| 13 | Anderson Drilling & Pump Inc. | 13 | 86 | 2,933 |
| 14 | Alexander W Smith Water Well Serv | 13 | 13 | 150 |
| 15 | Donamarc Water Systems Co. | 8 | 138 | 2,417 |
| 16 | J Miller & Sons Drilling | 8 | 8 | 1,124 |
| 17 | Yoder Drilling & Geothermal | 7 | 7 | 1,353 |
| 18 | Southwind Drilling Company | 5 | 6 | 4,282 |
| 19 | Jackson Well Services Inc. | 5 | 5 | 93 |
| 20 | Harley Drilling & Pumps Ltd | 4 | 519 | 1,154 |
| 21 | Valley Well & Pump Service Inc. | 4 | 139 | 1,409 |
| 22 | Pugh Well Drilling | 4 | 112 | 2,961 |
| 23 | Carroll's Well Drilling | 4 | 25 | 2,028 |
| 24 | Davidson Well Drilling | 4 | 6 | 3,177 |
| 25 | Robert E Smith Drilling | 3 | 695 | 2,483 |
| 26 | Arch's Well & Pump Service | 2 | 23 | 313 |
| 27 | Domer Water Services LLC | 2 | 6 | 145 |
| 28 | Depew (Russell) Well Drilling | 2 | 5 | 64 |
| 29 | Wayne Drilling | 1 | 2 | 40 |
| 30 | Adams & Sons Pump Service Inc. | 1 | 1 | 169 |
| 31 | Williams (Nick) Drilling | 1 | 1 | 320 |
| 32 | Graham Water Services | — | 1,272 | 1,347 |
| 33 | Wershing (Roy E) | — | 403 | 615 |
| 34 | Slanker Well Drilling | — | 327 | 794 |
| 35 | West Salem Drilling Co. | — | 287 | 530 |
| 36 | Johnson Hardware Co. | — | 174 | 1,334 |
| 37 | Mack Drilling | — | 154 | 353 |
| 38 | Graham (W R) | — | 147 | 190 |
| 39 | Gene's Water Service Inc. | — | 147 | 176 |
| 40 | Graham (E F) | — | 144 | 159 |
| 41 | Had Inc. | — | 132 | 783 |
| 42 | Frost Drilling | — | 120 | 386 |
| 43 | Fowler Drilling Inc. | — | 108 | 2,496 |
| 44 | C & K Well Drilling | — | 93 | 113 |
| 45 | Freed Water Well Drilling | — | 88 | 1,755 |
| 46 | Alchier Well Drilling | — | 84 | 849 |
| 47 | Shorts Water Well Drilling | — | 76 | 138 |
| 48 | Baldwin Qualified Well Drilling | — | 74 | 176 |
| 49 | Streetsboro Sales & Service | — | 70 | 2,180 |
| 50 | Smith (Gerald) Well Drilling | — | 69 | 456 |
| 51 | Smith & Sons | — | 69 | 448 |
| 52 | Yates (John W) | — | 66 | 66 |
| 53 | Fitzsimmons (Luke) | — | 65 | 190 |
| 54 | Bieri (K E) | — | 61 | 576 |
| 55 | R G Stockert Drilling Co. | — | 58 | 3,130 |
| 56 | Wadsworth Supply Co. | — | 58 | 78 |
| 57 | Cole (C E) | — | 58 | 70 |
| 58 | Cooper Water Well Drilling | — | 55 | 2,153 |
| 59 | Alert Well Drilling Co. | — | 49 | 138 |
| 60 | Fowler (H C) | — | 44 | 823 |
| 61 | Mellert (Kenneth A) | — | 42 | 78 |
| 62 | Urbank Well Drilling | — | 41 | 460 |
| 63 | Boreman Drilling | — | 40 | 156 |
| 64 | Hatfield (R A) & Son Inc. | — | 38 | 243 |
| 65 | Crowner Drilling Inc. | — | 36 | 1,190 |
| 66 | Schneider Well Drilling Inc. | — | 36 | 253 |
| 67 | Hoffman Drilling Co. | — | 35 | 98 |
| 68 | Mack (Robert E) | — | 35 | 64 |
| 69 | Wood Drilling | — | 33 | 112 |
| 70 | Cranz (Luman P) | — | 26 | 168 |
| 71 | Devore Drilling Co. | — | 26 | 36 |
| 72 | Urbank Brothers | — | 24 | 332 |
| 73 | Ohio Drilling Company | — | 23 | 409 |
| 74 | Marion Kornhaus Well Drilling | — | 23 | 565 |
| 75 | Mcclelland (Harry) & Son | — | 22 | 198 |
| 76 | Coventry Well & Pump Service | — | 21 | 519 |
| 77 | Ruby (Stan) Well Drilling | — | 20 | 750 |
| 78 | Jackson & Sons Drilling & Pump Co. | — | 19 | 3,154 |
| 79 | Colwell Drilling | — | 19 | 1,014 |
| 80 | Gordon & Sons Water Well Drilling | — | 14 | 25 |
| 81 | Hardman Drilling | — | 12 | 1,288 |
| 82 | Short Drilling | — | 11 | 1,580 |
| 83 | Stoltz (H L) & Son | — | 11 | 261 |
| 84 | H L Smith Well Drilling | — | 10 | 180 |
| 85 | Sprowls Drilling Co. (Groveport) | — | 10 | 84 |
| 86 | Stolzfus (Eli) | — | 10 | 47 |
| 87 | Roberts (Edward) Well Drilling | — | 9 | 108 |
| 88 | Fisher's Well Drilling | — | 9 | 92 |
| 89 | Massey Drilling Inc. | — | 9 | 43 |
| 90 | Johnson Excavating | — | 9 | 27 |
| 91 | Doug Adams Well Drilling | — | 8 | 2,323 |
| 92 | Stoltz Well Drilling | — | 8 | 685 |
| 93 | Aqua Drilling Inc. | — | 8 | 430 |
| 94 | Feiber (J M) | — | 8 | 90 |
| 95 | Hoffman's Water Well Service | — | 8 | 30 |
| 96 | Mullet Drilling Company Inc. | — | 7 | 2,605 |
| 97 | Frantz Dawson Drilling Co. | — | 6 | 498 |
| 98 | Burkhead Drilling & Excavating | — | 6 | 229 |
| 99 | T-Drilling | — | 6 | 210 |
| 100 | Harley (R S) | — | 6 | 164 |
| 101 | Bennett Drilling Co. | — | 5 | 1,074 |
| 102 | Schuster Well Drilling | — | 5 | 1,026 |
| 103 | Nichols Well Drilling | — | 5 | 271 |
| 104 | D & L Drilling LLC (Old) | — | 5 | 88 |
| 105 | Adams Drilling | — | 5 | 30 |
| 106 | Fredebaugh Well Drilling | — | 4 | 5,477 |
| 107 | Jenei Drilling Co. Inc. | — | 4 | 1,390 |
| 108 | Spencer (A C) | — | 4 | 386 |
| 109 | Robert Davis Well Drilling | — | 4 | 377 |
| 110 | A & A Well Drilling | — | 4 | 237 |
| 111 | Hall Drilling | — | 4 | 63 |
| 112 | Don Burrows Well Drilling | — | 3 | 514 |
| 113 | Bjaam Environmental Inc. | — | 3 | 156 |
| 114 | Quentin Neal Well Drilling | — | 3 | 491 |
| 115 | Murphy (R F) | — | 3 | 410 |
| 116 | Aqua Spring Well Drilling | — | 3 | 28 |
| 117 | K & B Well Drilling Co. | — | 2 | 1,837 |
| 118 | Denny Herr Well Drilling | — | 2 | 654 |
| 119 | Sprowls Drilling Co. | — | 2 | 1,348 |
| 120 | Shafer Well Drilling | — | 2 | 862 |
| 121 | Snell Well Drilling & Pumps | — | 2 | 688 |
| 122 | Diederich & Sons Drilling | — | 2 | 663 |
| 123 | Treadway (William) Well Drilling | — | 2 | 640 |
| 124 | Givens Well Drilling | — | 2 | 576 |
| 125 | Rex Drilling Co. | — | 2 | 478 |
| 126 | Fieldman (Herm) | — | 2 | 353 |
| 127 | Harley (V J) And Son | — | 2 | 236 |
| 128 | Anders Drilling | — | 2 | 219 |
| 129 | Marsh II Drilling | — | 2 | 133 |
| 130 | FW Eikleberry & Son | — | 2 | 111 |
| 131 | Hensel Drilling | — | 2 | 110 |
| 132 | Ohio Rotary Drilling Co. Inc. | — | 2 | 66 |
| 133 | Water Well Drilling & Supply Co. | — | 2 | 56 |
| 134 | Valley Well Drilling Co. | — | 2 | 53 |
| 135 | Ripley (S Glenn) | — | 2 | 32 |
| 136 | Quinter Well Drilling LLC | — | 1 | 12,078 |
| 137 | Hamilton & Sons Well Drilling | — | 1 | 3,862 |
| 138 | Walter's Well Drilling | — | 1 | 1,507 |
| 139 | Griffith Drilling Co. | — | 1 | 854 |
| 140 | Speedy Drilling Co. | — | 1 | 2,142 |
| 141 | Quality Water Systems | — | 1 | 2,919 |
| 142 | Holman (Dwight) Drilling | — | 1 | 1,708 |
| 143 | Plummer & Sons | — | 1 | 3,365 |
| 144 | Mckay & Gould Drilling Inc. | — | 1 | 1,993 |
| 145 | C E Burrows & Sons | — | 1 | 1,701 |
| 146 | Wilson (Jim) Well Drilling | — | 1 | 1,464 |
| 147 | Economy Well Drillers | — | 1 | 1,188 |
| 148 | Waltz Everett & Co. Inc. | — | 1 | 1,124 |
| 149 | Westfall Well Drilling | — | 1 | 846 |
| 150 | Hofacker (Roy) | — | 1 | 814 |
| 151 | Pichan Well Drilling | — | 1 | 701 |
| 152 | Smith Drilling Contractors | — | 1 | 609 |
| 153 | Agua Well Drilling Inc. | — | 1 | 449 |
| 154 | Robison Drilling | — | 1 | 443 |
| 155 | Hoover (J B) | — | 1 | 375 |
| 156 | Wright Well Drilling | — | 1 | 366 |
| 157 | Flick's Drilling Inc. | — | 1 | 355 |
| 158 | Layne Ohio (Layne Christensen) | — | 1 | 346 |
| 159 | Rhoades (Paul) | — | 1 | 340 |
| 160 | Fisher's Water Well Service | — | 1 | 310 |
| 161 | Anderson Water Well | — | 1 | 293 |
| 162 | Bach Brothers Drilling Co. | — | 1 | 288 |
| 163 | Brogan Well Drilling Co. | — | 1 | 155 |
| 164 | Mccullough (Gilbert) | — | 1 | 129 |
| 165 | Rowan Drilling Co. | — | 1 | 121 |
| 166 | Kamph's Pump & Well Service | — | 1 | 119 |
| 167 | Mark Hull Drilling | — | 1 | 117 |
| 168 | Don Smith Well Drilling | — | 1 | 108 |
| 169 | HD Sonic Drilling Inc. | — | 1 | 86 |
| 170 | Yarrish (John) | — | 1 | 85 |
| 171 | Ricketts & Co. | — | 1 | 83 |
| 172 | Larsen (N W) | — | 1 | 81 |
| 173 | Lehman Well Drilling | — | 1 | 80 |
| 174 | Lemon (Chester) & Son | — | 1 | 79 |
| 175 | Albert (D D) | — | 1 | 72 |
| 176 | Grim Water Systems | — | 1 | 71 |
| 177 | Action Well Drilling | — | 1 | 71 |
| 178 | Larry's Well Drilling | — | 1 | 57 |
| 179 | Shorts (Wayne) Well Drilling | — | 1 | 54 |
| 180 | Smith (James H) & Sons | — | 1 | 54 |
| 181 | Belasco Drilling Inc. | — | 1 | 47 |
| 182 | Shanker Well Drilling | — | 1 | 42 |
| 183 | Shorts (Russ) Well Drilling | — | 1 | 33 |
| 184 | Bowser-Morner (Dayton) | — | 1 | 30 |
| 185 | Weekley Well Drilling | — | 1 | 29 |