Illinois Oil and Gas Wells Map
WellsMap USA maps 207,254 oil and gas wells in Illinois, from Illinois State Geological Survey records (updated September 2026). 48,501 are listed as active and 116,724 as plugged, abandoned or never drilled. Wells are spread across 102 counties and 14,781 operators.
207,254Wells
48,501Active
90,309Oil wells
2,130Gas wells
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Illinois wells by type
| Type | Wells | Share |
|---|---|---|
| Oil | 90,083 | 43% |
| Dry hole | 54,150 | 26% |
| Injection / disposal | 24,062 | 12% |
| Unknown type | 21,360 | 10% |
| Test hole | 11,814 | 5.7% |
| Gas | 2,130 | 1.0% |
| Monitoring | 1,424 | 0.7% |
| Storage | 1,029 | 0.5% |
| Water | 959 | 0.5% |
| Oil & gas | 226 | 0.1% |
| Other | 17 | 0.0% |
Illinois wells by status
| Status | Wells | Share |
|---|---|---|
| Plugged | 116,558 | 56% |
| Active | 48,501 | 23% |
| Unknown status | 34,474 | 17% |
| Temporarily abandoned | 4,969 | 2.4% |
| Permitted | 2,586 | 1.2% |
| Cancelled / never drilled | 166 | 0.1% |
Counties with the most oil and gas wells in Illinois
| County | Wells | Active |
|---|---|---|
| Crawford | 25,116 | 7,806 |
| White | 15,686 | 4,884 |
| Lawrence | 15,670 | 5,283 |
| Wayne | 13,549 | 3,132 |
| Marion | 10,381 | 4,206 |
| Clay | 9,534 | 2,236 |
| Wabash | 8,726 | 1,934 |
| Clark | 8,689 | 1,581 |
| Fayette | 7,844 | 2,481 |
| Hamilton | 6,167 | 1,491 |
| Richland | 5,893 | 1,268 |
| Jasper | 4,983 | 949 |
| Edwards | 4,770 | 933 |
| Clinton | 4,761 | 1,188 |
| Jefferson | 4,660 | 1,027 |
| Franklin | 4,165 | 976 |
| Gallatin | 4,010 | 1,037 |
| Washington | 3,300 | 767 |
| Christian | 2,994 | 587 |
| Saline | 2,832 | 430 |
Top oil and gas operators in Illinois by well count
| Operator | Wells | Active |
|---|---|---|
| Ohio Oil Co., The | 10,709 | 3,623 |
| Marathon Oil Company | 4,487 | 1,423 |
| Pure Oil Company | 3,235 | 1,049 |
| Texaco, Inc. | 2,424 | 948 |
| Texas Company, The | 2,417 | 1,223 |
| Ohio Oil Company | 2,141 | 638 |
| The Pure Oil Company | 1,898 | 445 |
| Carter Oil Co., The | 1,811 | 526 |
| The Texas Company | 1,675 | 572 |
| Forest Oil Corporation | 1,664 | 241 |
| Magnolia Petroleum Company | 1,601 | 763 |
| National Associated Petroleum Co. | 1,550 | 302 |
| IL State Geological Survey | 1,546 | 0 |
| Tide Water Associated Oil Co. | 1,414 | 302 |
| Shell Oil Company | 1,328 | 424 |
| Exxon Corporation | 1,280 | 439 |
| Superior Oil Company | 1,274 | 532 |
| Carter Oil Co. | 1,196 | 471 |
| Brehm, C. E. Drilling & Producing | 1,066 | 160 |
| Northern Illinois Gas Co. | 1,064 | 2 |
Illinois wells drilled by decade
| Decade | Wells spudded |
|---|---|
| 1860s | 2 |
| 1880s | 8 |
| 1890s | 10 |
| 1900s | 9,925 |
| 1910s | 8,274 |
| 1920s | 1,114 |
| 1930s | 8,000 |
| 1940s | 29,204 |
| 1950s | 41,159 |
| 1960s | 25,833 |
| 1970s | 15,023 |
| 1980s | 28,712 |
| 1990s | 7,960 |
| 2000s | 6,209 |
| 2010s | 5,775 |
| 2020s | 1,187 |
Based on the 188,395 wells with a recorded spud date.
About this data
Well locations, types and statuses come from public records published by Illinois State Geological Survey, retrieved September 2026. Counties missing from the source records are assigned from each well's location. Records can be incomplete or out of date; check with the regulator before relying on them.