| 1 | Bapst Inc. | 328 | 881 | 5,348 |
| 2 | Central Soft Water | 171 | 174 | 1,489 |
| 3 | Stage Inc. (Dba R C Barry) | 150 | 514 | 1,117 |
| 4 | Blair Drilling & Pump Serv LLC | 95 | 294 | 593 |
| 5 | Beinhower Bros Drilling Co. | 85 | 1,011 | 3,766 |
| 6 | Seismic Drilling Co. Inc. | 73 | 125 | 5,783 |
| 7 | J E Wright Well Drilling | 63 | 164 | 1,126 |
| 8 | Cantrell Well Drilling | 45 | 111 | 477 |
| 9 | Keen Well And Pump | 32 | 134 | 10,231 |
| 10 | Mount Water Well Drilling | 29 | 59 | 3,547 |
| 11 | Eaton Well Drilling Inc. | 17 | 79 | 1,309 |
| 12 | Jamison Well Drilling Inc. | 14 | 19 | 11,219 |
| 13 | Bushong Drilling | 13 | 110 | 852 |
| 14 | Underhill Well & Pump Co. LLC | 13 | 78 | 519 |
| 15 | Warthman Drilling Inc. | 9 | 23 | 4,411 |
| 16 | Crabtree Drilling | 6 | 13 | 4,742 |
| 17 | Smith's Well Drilling LLC | 5 | 34 | 1,966 |
| 18 | K & B Well Drilling Co. | 5 | 14 | 1,837 |
| 19 | Moody's OF Dayton Inc. | 3 | 8 | 361 |
| 20 | Ellsworth Well & Pump | 3 | 4 | 1,026 |
| 21 | Jackson & Sons Drilling & Pump Co. | 1 | 178 | 3,154 |
| 22 | Hamilton & Sons Well Drilling | 1 | 3 | 3,862 |
| 23 | G H Bierly Inc. | 1 | 1 | 4,064 |
| 24 | Hurley's Water Well Drilling | 1 | 1 | 802 |
| 25 | Had Inc. | 1 | 1 | 783 |
| 26 | Plummer & Sons | — | 1,992 | 3,365 |
| 27 | R C Barry Company | — | 1,249 | 3,818 |
| 28 | Plummer Brothers | — | 634 | 863 |
| 29 | Ryan (A F) | — | 541 | 653 |
| 30 | New Rome Pump Service | — | 415 | 682 |
| 31 | Short Drilling | — | 367 | 1,580 |
| 32 | Plummer-Mcdannald Drilling | — | 362 | 1,333 |
| 33 | Barry (R C) | — | 360 | 1,392 |
| 34 | Wright (Merle) Well Drilling | — | 354 | 1,044 |
| 35 | Sprowls Drilling Co. | — | 334 | 1,348 |
| 36 | Paul W Wright Drilling | — | 326 | 1,236 |
| 37 | Carter (Elam) | — | 324 | 456 |
| 38 | May (H J) | — | 301 | 338 |
| 39 | Arthur E Plummer & Son | — | 256 | 560 |
| 40 | Vollmuth (Raymond A) | — | 246 | 946 |
| 41 | Lewis (Sam) Well Drilling | — | 245 | 310 |
| 42 | Eaton Well & Pump | — | 240 | 3,329 |
| 43 | Earl Davis Well Drilling | — | 232 | 289 |
| 44 | Underhill Water Well Drilling | — | 184 | 451 |
| 45 | Stebelton (Everett) | — | 179 | 181 |
| 46 | Agua Well Drilling Inc. | — | 171 | 449 |
| 47 | Edmonds Water Well Drilling | — | 169 | 308 |
| 48 | Frazier Drilling | — | 168 | 376 |
| 49 | Kautz Well Drilling | — | 164 | 251 |
| 50 | Wright Well Drilling | — | 163 | 366 |
| 51 | Peacock Well Drilling | — | 161 | 265 |
| 52 | Price Drilling | — | 124 | 184 |
| 53 | Underhill (Charles A SR) | — | 110 | 195 |
| 54 | Goodwin (R H) | — | 101 | 164 |
| 55 | Lewis Bros | — | 100 | 206 |
| 56 | Bauer Well Drilling | — | 98 | 393 |
| 57 | Short Brothers | — | 86 | 374 |
| 58 | Garnes Water Wells | — | 83 | 213 |
| 59 | Sells Well & Water Supply | — | 82 | 97 |
| 60 | Accurate Well Drilling | — | 81 | 111 |
| 61 | Dan Allen Well Drilling | — | 72 | 493 |
| 62 | Porter (M J & M S) | — | 66 | 69 |
| 63 | Professional Water Well Systems | — | 65 | 624 |
| 64 | Ricketts & Co. | — | 59 | 83 |
| 65 | Union County Drilling | — | 54 | 663 |
| 66 | Davis (J C) | — | 53 | 73 |
| 67 | Water Systems Inc. | — | 46 | 196 |
| 68 | Meyer Well Drilling | — | 43 | 758 |
| 69 | Silver Fleet Drilling | — | 42 | 61 |
| 70 | Aqua Drilling Inc. | — | 41 | 430 |
| 71 | Davis Drilling | — | 40 | 415 |
| 72 | Benedict Well Drilling | — | 38 | 58 |
| 73 | Dewitt Drilling Co. | — | 34 | 600 |
| 74 | Bushong (Charles Burton) | — | 34 | 295 |
| 75 | Ryan Well Drilling | — | 33 | 46 |
| 76 | Lehman Well Drilling | — | 32 | 80 |
| 77 | G M Baker & Son | — | 30 | 259 |
| 78 | Robert Davis Well Drilling | — | 27 | 377 |
| 79 | Lehman & Lynn | — | 27 | 59 |
| 80 | Swingle (Robert) | — | 27 | 37 |
| 81 | Cave Well Drilling | — | 26 | 204 |
| 82 | Underhill (James) | — | 26 | 58 |
| 83 | Hayes (Fred M) | — | 25 | 62 |
| 84 | Quinter Well Drilling LLC | — | 23 | 12,078 |
| 85 | B & B Well Drilling | — | 23 | 134 |
| 86 | Hamm (Everett G) | — | 23 | 33 |
| 87 | Layne Ohio (Layne Christensen) | — | 20 | 346 |
| 88 | Leindecker Well Drilling | — | 19 | 796 |
| 89 | Smith (J M) Water Well Drilling | — | 19 | 30 |
| 90 | Lewis & Son Well Drilling | — | 19 | 29 |
| 91 | Sprowls Drilling Co. (Groveport) | — | 17 | 84 |
| 92 | Cooper Water Well Drilling | — | 15 | 2,153 |
| 93 | Gobel Well Drilling | — | 15 | 1,184 |
| 94 | Swingle (Donald) Well Drilling | — | 15 | 364 |
| 95 | Pataskala Well Drilling | — | 15 | 362 |
| 96 | Timberlake (S B) | — | 15 | 37 |
| 97 | Dingess (Mansfield) Well Drilling | — | 15 | 35 |
| 98 | Ruby (Stan) Well Drilling | — | 14 | 750 |
| 99 | Wright (Larry) Drilling | — | 14 | 293 |
| 100 | Dingess (Jay) Well Drilling | — | 13 | 87 |
| 101 | Stone (Roy) | — | 13 | 32 |
| 102 | J & O Drilling | — | 12 | 399 |
| 103 | Garrabrant Well Drilling | — | 12 | 279 |
| 104 | Plummer (Walter) | — | 12 | 27 |
| 105 | Moats Drilling Co. | — | 11 | 196 |
| 106 | Spaulding (Raymond) | — | 11 | 142 |
| 107 | Flinner Drilling Inc. | — | 10 | 8,459 |
| 108 | Suburban Drilling Co. | — | 10 | 246 |
| 109 | C & P Well Drilling | — | 10 | 151 |
| 110 | Harpest (Ron) Well Drilling | — | 9 | 377 |
| 111 | Hines Drilling | — | 9 | 175 |
| 112 | Reynolds Inc. | — | 8 | 186 |
| 113 | Mayle (Paul A) | — | 8 | 27 |
| 114 | National Water Services (Lanc) | — | 7 | 91 |
| 115 | Easterling (D L) | — | 7 | 138 |
| 116 | Mullins Well Drilling | — | 7 | 60 |
| 117 | Riddle Well Drilling | — | 6 | 682 |
| 118 | Charles Allen Water Well Drilling | — | 6 | 235 |
| 119 | Plains Drilling Co. | — | 6 | 179 |
| 120 | M & S Drilling | — | 6 | 29 |
| 121 | Cook Drilling | — | 5 | 251 |
| 122 | Chas Hoover Well Drilling | — | 5 | 180 |
| 123 | Allen Water Well Drilling | — | 5 | 96 |
| 124 | Phillips Drilling Co. | — | 4 | 141 |
| 125 | Ulery Service & Repair | — | 4 | 197 |
| 126 | Lancaster Well Service | — | 4 | 179 |
| 127 | Price (Dwight E) | — | 4 | 161 |
| 128 | M & M Contractors | — | 4 | 79 |
| 129 | Belasco Drilling Inc. | — | 4 | 47 |
| 130 | Summers (Kenneth) | — | 4 | 30 |
| 131 | Ramsey Drilling | — | 3 | 614 |
| 132 | Fyffe (T J) | — | 3 | 747 |
| 133 | Buckeye Valley Well Drilling | — | 3 | 721 |
| 134 | Alliance Water Well Inc. | — | 3 | 458 |
| 135 | Smith & Sons | — | 3 | 448 |
| 136 | Danny's Water Well Drilling | — | 3 | 379 |
| 137 | Blauser (Grover C) | — | 3 | 247 |
| 138 | Bushong (Richard L) | — | 3 | 215 |
| 139 | Hoover Well Drilling | — | 3 | 173 |
| 140 | Phillips Water Well Drilling | — | 3 | 90 |
| 141 | Spung's Well Drilling | — | 3 | 80 |
| 142 | Combs (John O) | — | 3 | 74 |
| 143 | Fouts Drilling | — | 3 | 61 |
| 144 | C & H Water Well Drilling Co. | — | 3 | 55 |
| 145 | Water Boy Drilling | — | 3 | 47 |
| 146 | Snook Well Drilling Company | — | 3 | 30 |
| 147 | Walter's Well Drilling | — | 2 | 1,507 |
| 148 | Harpest Well Drilling | — | 2 | 781 |
| 149 | Gates Well Drilling | — | 2 | 496 |
| 150 | Stewart Well Drilling | — | 2 | 177 |
| 151 | Davis Water Systems | — | 2 | 80 |
| 152 | Keaton Drilling | — | 2 | 39 |
| 153 | Myers (Russell E) | — | 2 | 37 |
| 154 | Robinson (Homer) | — | 2 | 36 |
| 155 | Davis (Carl) | — | 2 | 34 |
| 156 | R & C Drilling Co. | — | 2 | 34 |
| 157 | Roof (Richard) | — | 2 | 25 |
| 158 | Able Well & Pump | — | 1 | 1,093 |
| 159 | Dean's Drilling | — | 1 | 1,010 |
| 160 | Automatic Septic & Well | — | 1 | 1,160 |
| 161 | Boone Water Systems Inc. | — | 1 | 740 |
| 162 | Valley Well & Pump Service Inc. | — | 1 | 1,409 |
| 163 | Minnix Water Systems Inc. | — | 1 | 295 |
| 164 | Mullet Drilling Company Inc. | — | 1 | 2,605 |
| 165 | Ayers Well Drilling | — | 1 | 2,270 |
| 166 | Shorts (John) Well Drilling | — | 1 | 927 |
| 167 | Palmer Drilling Inc. | — | 1 | 880 |
| 168 | Wes Britenstine Well Drilling | — | 1 | 786 |
| 169 | Waltz (D M) Drilling | — | 1 | 777 |
| 170 | Britenstine Well Drilling | — | 1 | 713 |
| 171 | Crane Well Drilling | — | 1 | 695 |
| 172 | Barnes & Sons | — | 1 | 446 |
| 173 | Kerr Corporation | — | 1 | 404 |
| 174 | Fraley Well Drilling | — | 1 | 362 |
| 175 | Complete Well Service | — | 1 | 362 |
| 176 | Oddo & Kimmett Water Well Drilling | — | 1 | 362 |
| 177 | Phillips Well Drilling | — | 1 | 338 |
| 178 | Wolfe's Drilling Co. | — | 1 | 323 |
| 179 | Casey's Well Drilling | — | 1 | 312 |
| 180 | Guy Hayslip & Son Well Drilling | — | 1 | 244 |
| 181 | Beal Well Drilling | — | 1 | 227 |
| 182 | Smith (R) Water Well Drilling | — | 1 | 190 |
| 183 | Wilson (Vance) Well Drilling | — | 1 | 181 |
| 184 | Brown Drilling | — | 1 | 152 |
| 185 | Berry (Gary) Well Drilling | — | 1 | 150 |
| 186 | Hoover Water Systems | — | 1 | 143 |
| 187 | Shorts Water Well Drilling | — | 1 | 138 |
| 188 | Dawson Drilling | — | 1 | 135 |
| 189 | Miller (Clay E) | — | 1 | 122 |
| 190 | Mark Hull Drilling | — | 1 | 117 |
| 191 | King Well Drilling | — | 1 | 103 |
| 192 | Spears (Daniel E) | — | 1 | 73 |
| 193 | Brothers Well Drilling | — | 1 | 72 |
| 194 | Delta Drilling | — | 1 | 71 |
| 195 | Shorts (Wayne) Well Drilling | — | 1 | 54 |
| 196 | Smith (James H) & Sons | — | 1 | 54 |
| 197 | Moran (John T) | — | 1 | 53 |
| 198 | Denman Water Well Drilling | — | 1 | 49 |
| 199 | Bill's Bit Service | — | 1 | 47 |
| 200 | Bevard (Carl) Well Drilling | — | 1 | 40 |
| 201 | Diehl Pump & Supply Co. Inc. | — | 1 | 38 |
| 202 | Mcdaniel Well Drilling | — | 1 | 35 |
| 203 | Bowser-Morner (Dayton) | — | 1 | 30 |
| 204 | Aqua Spring Well Drilling | — | 1 | 28 |
| 205 | Harper (W H) | — | 1 | 27 |