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Illinois oil and gas wells

207,298 wells on record: 116,568 plugged. Source: Illinois State Geological Survey, data as of 2026-10-17.

Illinois State Geological Survey (ISGS), ILOIL wells database. ISGS records how each well was completed and the company that drilled it, not current production, so wells without a plugging record are shown as status not reported and the company shown is the operator when drilled.

Top 50 operators by wells on record

Operator when drilled	Active	All wells
Ohio Oil Co., The	0	10,709
Marathon Oil Company	0	4,487
Pure Oil Company	0	3,235
Texaco, Inc.	0	2,424
Texas Company, The	0	2,417
Ohio Oil Company	0	2,141
The Pure Oil Company	0	1,898
Carter Oil Co., The	0	1,811
The Texas Company	0	1,675
Forest Oil Corporation	0	1,664
Magnolia Petroleum Company	0	1,601
National Associated Petroleum Co.	0	1,550
IL State Geological Survey	0	1,546
Tide Water Associated Oil Co.	0	1,414
Shell Oil Company	0	1,328
Exxon Corporation	0	1,280
Superior Oil Company	0	1,274
Carter Oil Co.	0	1,196
Brehm, C. E. Drilling & Producing	0	1,066
Northern Illinois Gas Co.	0	1,064
Gulf Refining Company	0	997
Union Oil Company of California	0	916
Associated Oil Production Co.	0	837
Sun Production Co (Sun Oil)	0	804
Mahutska Oil Company	0	780
Texas Co., The	0	772
Petco Petroleum Corp.	0	757
Natural Gas Pipeline Co. of America	0	730
Phillips Petroleum, Co.	0	698
Calvert Drilling, Inc.	0	673
Ashland Oil & Refining Company	0	672
Citation Oil & Gas Corp.	0	667
Alco Oil & Gas Corp.	0	652
Bi-Petro, Inc.	0	632
C. E. Brehm Drilling & Prod.	0	618
McBride, W. C. Inc.	0	611
Campbell Energy, LLC	0	605
Vickery Drilling Co., Inc.	0	573
Kingwood Oil Co.	0	558
Collins Brothers Oil Company	0	544
Granholm & Assoc.	0	540
Illinois State Geological Survey	0	537
George & Wrather Oil	0	530
Oelze, Elmer Jr.	0	515
Christa Oil Company, Inc.	0	513
Illinois Power Co.	0	510
Fulk, Perry	0	504
Skiles Oil Corporation	0	504
Crete Oil Investments, Inc.	0	502
Duncan, Walter	0	502

Wells by county

Adams 1,046
Alexander 69
Bond 1,532
Boone 60
Brown 1,636
Bureau 86
Calhoun 21
Carroll 46
Cass 46
Champaign 834
Christian 2,961
Clark 8,701
Clay 9,516
Clinton 4,666
Coles 2,520
Cook 526
Crawford 25,119
Cumberland 2,710
De Witt 269
DeKalb 79
Douglas 1,030
DuPage 116
Edgar 1,280
Edwards 4,772
Effingham 2,124
Fayette 7,850
Ford 198
Franklin 4,186
Fulton 148
Gallatin 4,042
Greene 142
Grundy 85
Hamilton 6,152
Hancock 233
Hardin 92
Henderson 185
Henry 262
Iroquois 731
Jackson 398
Jasper 4,982
Jefferson 4,655
Jersey 76
Jo Daviess 11
Johnson 48
Kane 321
Kankakee 740
Kendall 373
Knox 186
LaSalle 875
Lake 538
Lawrence 15,740
Lee 83
Livingston 650
Logan 237
Macon 1,015
Macoupin 1,131
Madison 1,937
Marion 10,480
Marshall 28
Mason 78
Massac 144
McDonough 1,264
McHenry 181
McLean 618
Menard 35
Mercer 135
Monroe 518
Montgomery 1,364
Morgan 542
Moultrie 262
Ogle 241
Peoria 280
Perry 663
Piatt 192
Pike 646
Pope 188
Pulaski 116
Putnam 38
Randolph 680
Richland 5,932
Rock Island 62
Saline 2,828
Sangamon 1,690
Schuyler 1,162
Scott 52
Shelby 1,073
St. Clair 1,650
Stark 109
Stephenson 17
Tazewell 161
Union 88
Vermilion 207
Wabash 8,960
Warren 191
Washington 3,312
Wayne 13,563
White 15,847
Whiteside 18
Will 539
Williamson 723
Winnebago 180
Woodford 174