| 1 | Jamison Well Drilling Inc. | 378 | 517 | 11,219 |
| 2 | R H Fowler Well Drilling LLC | 180 | 634 | 844 |
| 3 | A W Smith Well Drilling | 125 | 347 | 1,041 |
| 4 | Pugh (L E) | 97 | 1,292 | 1,908 |
| 5 | Alexander W Smith Water Well Serv | 91 | 91 | 150 |
| 6 | Carroll's Well Drilling | 87 | 172 | 2,028 |
| 7 | Depew Well Drilling | 82 | 207 | 2,080 |
| 8 | Central Soft Water | 80 | 80 | 1,489 |
| 9 | Anderson Drilling & Pump Inc. | 69 | 1,522 | 2,933 |
| 10 | Cooper Water Well Drilling | 68 | 1,094 | 2,153 |
| 11 | Donamarc Water Systems Co. | 64 | 947 | 2,417 |
| 12 | Robert E Burrows Well Drilling | 61 | 110 | 1,615 |
| 13 | Arch's Well & Pump Service | 54 | 244 | 313 |
| 14 | Keen Well And Pump | 51 | 84 | 10,231 |
| 15 | Valley Well & Pump Service Inc. | 45 | 742 | 1,409 |
| 16 | Southwind Drilling Company | 29 | 41 | 4,282 |
| 17 | Robert E Smith Drilling | 20 | 1,357 | 2,483 |
| 18 | Pugh Well Drilling | 19 | 2,265 | 2,961 |
| 19 | Davidson Well Drilling | 16 | 44 | 3,177 |
| 20 | Adams & Sons Pump Service Inc. | 15 | 16 | 169 |
| 21 | Flinner Drilling Inc. | 14 | 200 | 8,459 |
| 22 | Patriot Drilling | 14 | 100 | 470 |
| 23 | Jackson Well Services Inc. | 12 | 12 | 93 |
| 24 | Greg Rogers Enterprises | 11 | 12 | 446 |
| 25 | Denny Herr Well Drilling | 9 | 17 | 654 |
| 26 | A & G Well Drilling Inc. | 8 | 97 | 1,010 |
| 27 | Don Burrows Well Drilling | 7 | 33 | 514 |
| 28 | J Miller & Sons Drilling | 7 | 7 | 1,124 |
| 29 | Yoder Drilling & Geothermal | 5 | 5 | 1,353 |
| 30 | Fredebaugh Well Drilling | 3 | 20 | 5,477 |
| 31 | Depew (Levi) Well Drilling | 3 | 10 | 173 |
| 32 | Domer Water Services LLC | 2 | 3 | 145 |
| 33 | Had Inc. | 1 | 114 | 783 |
| 34 | Blazek Well Drilling | 1 | 33 | 1,037 |
| 35 | Aces Well Service | 1 | 1 | 35 |
| 36 | Fowler Drilling Inc. | — | 2,189 | 2,496 |
| 37 | Freed Water Well Drilling | — | 771 | 1,755 |
| 38 | Fowler (H C) | — | 692 | 823 |
| 39 | Colwell Drilling | — | 663 | 1,014 |
| 40 | Alchier Well Drilling | — | 659 | 849 |
| 41 | Frantz Dawson Drilling Co. | — | 459 | 498 |
| 42 | Givens Well Drilling | — | 400 | 576 |
| 43 | Coventry Well & Pump Service | — | 380 | 519 |
| 44 | Urbank Well Drilling | — | 368 | 460 |
| 45 | Fieldman (Herm) | — | 323 | 353 |
| 46 | Murphy (R F) | — | 294 | 410 |
| 47 | Streetsboro Sales & Service | — | 276 | 2,180 |
| 48 | Spencer (A C) | — | 274 | 386 |
| 49 | Urbank Brothers | — | 274 | 332 |
| 50 | Westfall Well Drilling | — | 270 | 846 |
| 51 | Slanker Well Drilling | — | 269 | 794 |
| 52 | Smith (Gerald) Well Drilling | — | 246 | 456 |
| 53 | Yantis (H V) | — | 229 | 358 |
| 54 | Bieri (K E) | — | 141 | 576 |
| 55 | Cranz (Luman P) | — | 140 | 168 |
| 56 | R G Stockert Drilling Co. | — | 114 | 3,130 |
| 57 | Quentin Neal Well Drilling | — | 106 | 491 |
| 58 | Nichols Well Drilling | — | 102 | 271 |
| 59 | Rowan Drilling Co. | — | 102 | 121 |
| 60 | Hensel Drilling | — | 100 | 110 |
| 61 | James Westfall Well Drilling | — | 98 | 389 |
| 62 | Anders Drilling | — | 97 | 219 |
| 63 | Wershing (Roy E) | — | 93 | 615 |
| 64 | H L Smith Well Drilling | — | 84 | 180 |
| 65 | Doug Adams Well Drilling | — | 82 | 2,323 |
| 66 | Smith & Sons | — | 71 | 448 |
| 67 | Snyder (L E) | — | 71 | 88 |
| 68 | Johnson Hardware Co. | — | 65 | 1,334 |
| 69 | Max Herr Well & Pump Service LLC | — | 63 | 2,176 |
| 70 | Bean & Son | — | 59 | 74 |
| 71 | Don Smith Well Drilling | — | 56 | 108 |
| 72 | Feiber (J M) | — | 56 | 90 |
| 73 | A & A Well Drilling | — | 55 | 237 |
| 74 | Sparks Drilling | — | 55 | 113 |
| 75 | Rhoades (Paul) | — | 54 | 340 |
| 76 | Baldwin Qualified Well Drilling | — | 53 | 176 |
| 77 | Branecky (Joseph) | — | 50 | 275 |
| 78 | Wolverton (Ken) Well Drilling | — | 49 | 221 |
| 79 | Williams (Ronald) Drilling Co. | — | 46 | 540 |
| 80 | Fisher's Well Drilling | — | 45 | 92 |
| 81 | Larry's Well Drilling | — | 45 | 57 |
| 82 | C E Burrows & Sons | — | 44 | 1,701 |
| 83 | Graham Water Services | — | 42 | 1,347 |
| 84 | Quinter Well Drilling LLC | — | 41 | 12,078 |
| 85 | Ohio Drilling Company | — | 38 | 409 |
| 86 | Roth Earth Boring | — | 37 | 231 |
| 87 | Hall Drilling | — | 37 | 63 |
| 88 | Jenei Drilling Co. Inc. | — | 34 | 1,390 |
| 89 | Aqua Drilling Inc. | — | 34 | 430 |
| 90 | Graham (W R) | — | 34 | 190 |
| 91 | Hickman (Charles W) | — | 31 | 157 |
| 92 | Waltz (Kenneth) & Sons | — | 24 | 195 |
| 93 | Weekley Well Drilling | — | 24 | 29 |
| 94 | Culp Drilling Co. | — | 23 | 531 |
| 95 | Boreman Drilling | — | 23 | 156 |
| 96 | Lininger Drilling & Pumps Inc. | — | 22 | 491 |
| 97 | Hatfield (R A) & Son Inc. | — | 22 | 243 |
| 98 | Hamilton (J D JR) | — | 22 | 159 |
| 99 | Wadsworth Supply Co. | — | 19 | 78 |
| 100 | Ripley (S Glenn) | — | 19 | 32 |
| 101 | Marion Kornhaus Well Drilling | — | 18 | 565 |
| 102 | Mack Drilling | — | 18 | 353 |
| 103 | Lemon (Chester) & Son | — | 18 | 79 |
| 104 | Nemeth Plumbing & Heating | — | 18 | 34 |
| 105 | Templeton Well Drilling | — | 17 | 1,364 |
| 106 | Brown Drilling | — | 17 | 152 |
| 107 | Gene's Water Service Inc. | — | 15 | 176 |
| 108 | Bjaam Environmental Inc. | — | 14 | 156 |
| 109 | Schneider Well Drilling Inc. | — | 13 | 253 |
| 110 | Blocksom (P L) | — | 13 | 206 |
| 111 | Suburban Pump Company | — | 13 | 130 |
| 112 | Harley Drilling & Pumps Ltd | — | 12 | 1,154 |
| 113 | Fearon & Feller Inc. | — | 12 | 1,028 |
| 114 | Frost Drilling | — | 12 | 386 |
| 115 | Carl Lemon Well Drilling | — | 12 | 163 |
| 116 | Bennett Drilling Co. | — | 11 | 1,074 |
| 117 | Tonkin Well Drilling | — | 11 | 31 |
| 118 | Jackson & Sons Drilling & Pump Co. | — | 10 | 3,154 |
| 119 | Wright (Merle) Well Drilling | — | 10 | 1,044 |
| 120 | Smith's Well Drilling LLC | — | 9 | 1,966 |
| 121 | Griffith Drilling Co. | — | 9 | 854 |
| 122 | Valley Well Drilling Co. | — | 9 | 53 |
| 123 | Wright Well Drilling | — | 8 | 366 |
| 124 | Hupp Well & Pump Co. | — | 8 | 317 |
| 125 | Holman (Dwight) Drilling | — | 7 | 1,708 |
| 126 | Ayers Well Drilling | — | 7 | 2,270 |
| 127 | Pittman (Carl F) | — | 7 | 315 |
| 128 | Hamilton (Frank S) | — | 7 | 40 |
| 129 | Williams (Nick) Drilling | — | 6 | 320 |
| 130 | Mullet Drilling Company Inc. | — | 6 | 2,605 |
| 131 | Hrubik Well Drilling | — | 6 | 433 |
| 132 | Spencer Drilling Inc. | — | 6 | 261 |
| 133 | Brogan Well Drilling Co. | — | 6 | 155 |
| 134 | HD Sonic Drilling Inc. | — | 6 | 86 |
| 135 | Davis (J C) | — | 6 | 73 |
| 136 | Rhodes Inc. | — | 6 | 61 |
| 137 | Aqua Spring Well Drilling | — | 6 | 28 |
| 138 | Peck Well Drilling | — | 5 | 333 |
| 139 | Suburban Drilling Co. | — | 5 | 246 |
| 140 | Field Well Drilling | — | 5 | 210 |
| 141 | J M Drilling | — | 5 | 32 |
| 142 | Pichan Well Drilling | — | 4 | 701 |
| 143 | Burkhead Drilling & Excavating | — | 4 | 229 |
| 144 | Kamph's Pump & Well Service | — | 4 | 119 |
| 145 | C & K Well Drilling | — | 4 | 113 |
| 146 | Graham (Parker) | — | 4 | 83 |
| 147 | Depew (Russell) Well Drilling | — | 4 | 64 |
| 148 | Walter's Well Drilling | — | 3 | 1,507 |
| 149 | Quality Water Systems | — | 3 | 2,919 |
| 150 | Williams Drilling Co. | — | 3 | 65 |
| 151 | Waltz (D M) Drilling | — | 3 | 777 |
| 152 | Ruby (Stan) Well Drilling | — | 3 | 750 |
| 153 | Skolnik (J J) Pump Service | — | 3 | 494 |
| 154 | Harpest (Ron) Well Drilling | — | 3 | 377 |
| 155 | Hamilton (H S) & Sons | — | 3 | 346 |
| 156 | Lovely (Hershel) Well Drilling | — | 3 | 117 |
| 157 | Action Well Drilling | — | 3 | 71 |
| 158 | Mcfarland Drilling Co. | — | 3 | 71 |
| 159 | Belasco Drilling Inc. | — | 3 | 47 |
| 160 | Smith (J M) Water Well Drilling | — | 3 | 30 |
| 161 | Landrum Drilling & Pump | — | 2 | 299 |
| 162 | Crowner Drilling Inc. | — | 2 | 1,190 |
| 163 | Jones Drilling | — | 2 | 631 |
| 164 | Smith Drilling Contractors | — | 2 | 609 |
| 165 | Stoltz (H L) & Son | — | 2 | 261 |
| 166 | B E Wright Drilling | — | 2 | 260 |
| 167 | G M Baker & Son | — | 2 | 259 |
| 168 | Scott (R G) | — | 2 | 247 |
| 169 | K & S Well Drilling | — | 2 | 161 |
| 170 | Shorts Water Well Drilling | — | 2 | 138 |
| 171 | H & H Drilling (Alliance) | — | 2 | 136 |
| 172 | Murral Drilling | — | 2 | 89 |
| 173 | Foltz Well Drilling | — | 2 | 79 |
| 174 | Darrell's Water Well Drilling | — | 2 | 58 |
| 175 | William Fait Drilling | — | 2 | 56 |
| 176 | Moody & Associates Inc. | — | 2 | 33 |
| 177 | Adams Drilling | — | 2 | 30 |
| 178 | Buckeye Drilling | — | 2 | 29 |
| 179 | Seismic Drilling Co. Inc. | — | 1 | 5,783 |
| 180 | G H Bierly Inc. | — | 1 | 4,064 |
| 181 | Burgess Drilling Inc. | — | 1 | 3,562 |
| 182 | Hall And Jenkins Well Drilling | — | 1 | 968 |
| 183 | D & L Drilling LLC | — | 1 | 310 |
| 184 | Minnix Water Systems Inc. | — | 1 | 295 |
| 185 | Wayne Drilling | — | 1 | 40 |
| 186 | Mckay & Gould Drilling Inc. | — | 1 | 1,993 |
| 187 | Wilson (Jim) Well Drilling | — | 1 | 1,464 |
| 188 | Sprowls Drilling Co. | — | 1 | 1,348 |
| 189 | Paul W Wright Drilling | — | 1 | 1,236 |
| 190 | Economy Well Drillers | — | 1 | 1,188 |
| 191 | Waltz Everett & Co. Inc. | — | 1 | 1,124 |
| 192 | Smith Drilling Co. Inc. | — | 1 | 988 |
| 193 | Palmer Drilling Inc. | — | 1 | 880 |
| 194 | Stoffel Well Drilling | — | 1 | 707 |
| 195 | Snell Well Drilling & Pumps | — | 1 | 688 |
| 196 | Stoltz Well Drilling | — | 1 | 685 |
| 197 | Roberts (Willard) Well Drilling | — | 1 | 635 |
| 198 | Agua Well Drilling Inc. | — | 1 | 449 |
| 199 | Layne Ohio (Layne Christensen) | — | 1 | 346 |
| 200 | Sugarcreek Drilling | — | 1 | 333 |
| 201 | Wright (Larry) Drilling | — | 1 | 293 |
| 202 | Scott (Oakey) Well Drilling | — | 1 | 281 |
| 203 | Clinton Well Drillers | — | 1 | 256 |
| 204 | A-1 Water Service | — | 1 | 252 |
| 205 | J & J Builders | — | 1 | 240 |
| 206 | S & S Well Drilling | — | 1 | 214 |
| 207 | Mid-America Recovery Service | — | 1 | 208 |
| 208 | Markle Drilling | — | 1 | 199 |
| 209 | Mcclelland (Harry) & Son | — | 1 | 198 |
| 210 | Smith (R) Water Well Drilling | — | 1 | 190 |
| 211 | Fitzsimmons (Luke) | — | 1 | 190 |
| 212 | Mike Herr Well & Pump | — | 1 | 179 |
| 213 | Halls Well Drilling | — | 1 | 149 |
| 214 | Mark Hull Drilling | — | 1 | 117 |
| 215 | Hoffman Drilling Co. | — | 1 | 98 |
| 216 | Flanagan Drilling | — | 1 | 88 |
| 217 | Reynolds (B A) | — | 1 | 88 |
| 218 | Mellert (Kenneth A) | — | 1 | 78 |
| 219 | Scheideggers Pump Service | — | 1 | 76 |
| 220 | Ohio Rotary Drilling Co. Inc. | — | 1 | 66 |
| 221 | Stoffer Drilling | — | 1 | 34 |
| 222 | Northcoast Drilling Service Inc. | — | 1 | 32 |
| 223 | Starkey Water Well Drilling | — | 1 | 32 |
| 224 | C & R Water Well Drilling | — | 1 | 28 |
| 225 | Harper (W H) | — | 1 | 27 |
| 226 | Spencer (Marvin J) | — | 1 | 25 |
| 227 | Gordon & Sons Water Well Drilling | — | 1 | 25 |