199,349 wells across 13,021 recorded operators, with 502 drilling permits filed in the 24-month window at source refresh.
Daily refresh scheduled from IDNR well-header records. Stored source refresh: 2026-09-16.
Formation summary: Stored source refresh: 2026-09-16. This formation/play summary uses recorded well and operator counts and permit dates in the preceding 24 months at summary refresh. Operator counts do not verify current operations. Summary counts and the separately refreshed permit and DUC lists may have different coverage. This is a capped directory of stored records, not a complete statewide count. Permit list: Stored source refresh: 2026-09-17. At most 50 displayed permit records match the formation name, ordered by permit date. This operator-linked list can differ from the summary permit count; a permit is not proof of drilling or production. This is a capped directory of stored records, not a complete statewide count. DUC list: No stored records are available in this view; this does not establish zero activity. At most 30 displayed records match the formation name, ordered by spud date. A spud date with no reported first production is a DUC proxy, not verified completion status. Elapsed days are computed at source refresh. This is a capped directory of stored records, not a complete statewide count.
Stored source refresh: 2026-09-16. This formation/play summary uses recorded well and operator counts and permit dates in the preceding 24 months at summary refresh. Operator counts do not verify current operations. Summary counts and the separately refreshed permit and DUC lists may have different coverage. This is a capped directory of stored records, not a complete statewide count.
Compiled from Illinois Department of Natural Resources records through a commercial well-data aggregator. Scheduled refreshes do not guarantee that new regulator filings are available. Use the source records to check a specific well.
Stored source refresh: 2026-09-17. At most 50 displayed permit records match the formation name, ordered by permit date. This operator-linked list can differ from the summary permit count; a permit is not proof of drilling or production. This is a capped directory of stored records, not a complete statewide count.
Compiled from Illinois Department of Natural Resources records through a commercial well-data aggregator. Scheduled refreshes do not guarantee that new regulator filings are available. Use the source records to check a specific well.
No stored records are available in this view; this does not establish zero activity. At most 30 displayed records match the formation name, ordered by spud date. A spud date with no reported first production is a DUC proxy, not verified completion status. Elapsed days are computed at source refresh. This is a capped directory of stored records, not a complete statewide count.
Compiled from Illinois Department of Natural Resources records through a commercial well-data aggregator. Scheduled refreshes do not guarantee that new regulator filings are available. Use the source records to check a specific well.
Quick answer: The Illinois Basin formation in Illinois has 199,349 wells on record across 13,021 recorded operators, with 502 drilling permits filed in the 24-month window at source refresh. Its operators with the most wells on record are The Ohio Oil, Marathon Oil Company, The Texas Company, Pure Oil Company and Texaco. Compiled from Illinois Department of Natural Resources (IDNR) well-header records. Summary: Stored source refresh: 2026-09-16. Permit list: Stored source refresh: 2026-09-17. DUC list: No stored records are available in this view; this does not establish zero activity. The lists have separate coverage limits.
The operators with the most well counts targeting the Illinois Basin formation in Illinois:
| # | Operator | Wells in Illinois Basin |
|---|---|---|
| 1 | The Ohio Oil | 10,768 |
| 2 | Marathon Oil Company | 4,511 |
| 3 | The Texas Company | 4,094 |
| 4 | Pure Oil Company | 3,218 |
| 5 | Texaco | 2,426 |
| 6 | Ohio Oil Company | 2,180 |
| 7 | The Pure Oil Company | 1,931 |
| 8 | The Carter Oil | 1,811 |
| 9 | Forest Oil | 1,671 |
| 10 | Magnolia Petroleum Company | 1,602 |
The Illinois counties with the most Illinois Basin activity:
Crawford, White, Lawrence, Wayne, Peoria
The most recent 50 drilling permits filed for Illinois Basin wells in Illinois:
| Permit Date | Well | API | County | Operator | Lateral (ft) |
|---|---|---|---|---|---|
| 2026-07-30 | Centralia 3-Hor | 121212856800 |
Marion | Ameren Illinois Company | — |
| 2026-07-29 | Centralia 2-Hor | 121212856700 |
Marion | Ameren Illinois Company | — |
| 2026-07-28 | Obc 25-3 | 121992422000 |
Williamson | Keyrock Energy | — |
| 2026-07-27 | Howell 7-B Hor | 121212857000 |
Marion | Schwartz Oil Properties | — |
| 2026-07-27 | Illinois Minerals 19-1 | 120552533600 |
Franklin | Stewart Producers | — |
| 2026-07-27 | Freeburg 19-Hor | 121633175100 |
St Clair | Ameren Illinois Company | — |
| 2026-07-27 | Howell 6-C Hor | 121212856900 |
Marion | Schwartz Oil Properties | — |
| 2026-07-23 | Cox 10-5 | 121933452100 |
White | Loeb Hermanllc | — |
| 2026-07-23 | Boarman 6 | 121672843500 |
Sangamon | Keyrock Energy | — |
| 2026-07-23 | Boarman 7 | 121672843400 |
Sangamon | Keyrock Energy | — |
| 2026-07-23 | Harrelson 1-A | 120552533800 |
Franklin | Gesells Pump Sales Service | — |
| 2026-07-17 | Moondog 1-2 | 121933451900 |
White | Loeb Hermanllc | — |
| 2026-07-14 | Dre - Lewis 1 | 120252954200 |
Clay | Deep Rock Energy | — |
| 2026-07-14 | Eclipse 2-2 | 121933451800 |
White | Loeb Hermanllc | — |
| 2026-07-13 | Moye, Lillis 2-D | 120592590500 |
Gallatin | Dee Drilling | — |
| 2026-07-13 | Fitzgerrell A 10-A | 120552533700 |
Franklin | Gesells Pump Sales Service | — |
| 2026-07-09 | Kirk Wi-3 | 120333857900 |
Crawford | B D Resources | — |
| 2026-07-09 | Kluthe 10 | 120492523800 |
Effingham | Loeb Hermanllc | — |
| 2026-07-09 | Jjmd 1-A | 121072368500 |
Logan | Keyrock Energy | — |
| 2026-07-09 | Kirk Wi-2 | 120333857800 |
Crawford | B D Resources | — |
| 2026-07-08 | Kirk Wi-1 | 120333857700 |
Crawford | B D Resources | — |
| 2026-07-08 | U. S. Steel A 6-A | 120552526801 |
Franklin | Gesells Pump Sales Service | — |
| 2026-07-02 | Raney 1 | 121933452000 |
White | Campbell Energy | — |
| 2026-07-01 | Keller Swd-1 | 120792579100 |
Jasper | Loeb Hermanllc | — |
| 2026-06-30 | 460 Realty Swd 1 | 120652579500 |
Hamilton | Bipetro | — |
| 2026-06-29 | Lewis 3 | 120252954100 |
Clay | Dee Drilling | — |
| 2026-06-29 | Webb - Clark 3 | 120652390402 |
Hamilton | Webb Patrick Oil | — |
| 2026-06-29 | Calvert D-2 | 121930174002 |
White | Dee Drilling | — |
| 2026-06-29 | Vandermark, G. L. 1 | 121013259901 |
Lawrence | Cdg Operations | — |
| 2026-06-25 | Sewu 24 | 120552533300 |
Franklin | Gesells Pump Sales Service | — |
| 2026-06-25 | Chamness 1 | 120552533500 |
Franklin | Keyrock Energy | — |
| 2026-06-25 | Miller 1-7 | 120652579600 |
Hamilton | Bipetro | — |
| 2026-06-25 | Zeigler 1 2 | 120552533400 |
Franklin | Keyrock Energy | — |
| 2026-06-25 | Mclean 1-Swd | 121930419401 |
White | Campbell Energy | — |
| 2026-06-25 | Anselment 3-B | 120652579001 |
Hamilton | Bipetro | — |
| 2026-06-15 | Keller 3-6 | 120792578900 |
Jasper | Loeb Hermanllc | — |
| 2026-06-10 | Gray 17 | 121933450500 |
White | Keepes Petroleum | — |
| 2026-06-09 | Catt 2-A | 121013321000 |
Lawrence | Dee Drilling | — |
| 2026-06-03 | Spidel 10-H-2 | 121852890401 |
Wabash | R S Operating | — |
| 2026-06-03 | Spidel 10-H | 121852836001 |
Wabash | R S Operating | — |
| 2026-06-02 | Illinois Minerals 1-12w | 121992415601 |
Williamson | Gesells Pump Sales Service | — |
| 2026-06-02 | Keller 2-6 | 120792578800 |
Jasper | Loeb Hermanllc | — |
| 2026-05-29 | Loss 4 | 120812533800 |
Jefferson | Mke Producing | — |
| 2026-05-28 | Spidel 11-H | 121852853303 |
Wabash | R S Operating | — |
| 2026-05-22 | Reckling Etal Unit 1-W | 120472304601 |
Edwards | Lynch Darrell | — |
| 2026-05-18 | Hocking, Connie 1 | 121852942500 |
Wabash | Keyrock Energy | — |
| 2026-05-18 | Hertlein 2-B | 121930759401 |
White | Acf Resources | — |
| 2026-05-18 | Rowland 1-8 | 120652579400 |
Hamilton | Bipetro | — |
| 2026-05-18 | Brooks, Dre 1 | 120252954000 |
Clay | Deep Rock Energy | — |
| 2026-05-18 | Henderson 2-B | 120652579200 |
Hamilton | Bipetro | — |
The Illinois Basin is a formation/play group recorded in Illinois, with 199,349 wells on file across 13,021 distinct operators of record. Operators have filed 502 drilling permits targeting the Illinois Basin in the 24-month window at summary refresh. These are stored records, not a live measure of drilling.
Recorded formation activity provides regional context. It does not establish ownership, future production, royalty payments or a value for an individual tract. Consult qualified professionals about your specific interest.
Browse listed Illinois oil & gas formations & plays · Download the Illinois formations dataset (CSV)
199,349 wells target the Illinois Basin in Illinois, worked by 13,021 recorded operators, per IDNR well-header records. Summary: Stored source refresh: 2026-09-16. Permit list: Stored source refresh: 2026-09-17. DUC list: No stored records are available in this view; this does not establish zero activity. The lists have separate coverage limits.
By well count, the operators with the most Illinois Basin wells on record in Illinois are The Ohio Oil, Marathon Oil Company, The Texas Company, Pure Oil Company and Texaco. The full ranking is in the table on this page. Summary: Stored source refresh: 2026-09-16. Permit list: Stored source refresh: 2026-09-17. DUC list: No stored records are available in this view; this does not establish zero activity. The lists have separate coverage limits.
Operators filed 502 drilling permits targeting the Illinois Basin in the 24-month window at source refresh, per IDNR records. Summary: Stored source refresh: 2026-09-16. Permit list: Stored source refresh: 2026-09-17. DUC list: No stored records are available in this view; this does not establish zero activity. The lists have separate coverage limits.
Operators filed 502 new drilling permits targeting the Illinois Basin in Illinois in the 24-month window at source refresh. New permits and spuds record reported activity stages; they do not establish ongoing drilling, per IDNR records. Summary: Stored source refresh: 2026-09-16. Permit list: Stored source refresh: 2026-09-17. DUC list: No stored records are available in this view; this does not establish zero activity. The lists have separate coverage limits.
Illinois Basin activity in Illinois includes 199,349 wells on record and 13,021 recorded operators, led by The Ohio Oil, Marathon Oil Company, The Texas Company, Pure Oil Company and Texaco, with 502 drilling permits filed in the 24-month window at source refresh — from Illinois Department of Natural Resources (IDNR) well-header records. Summary: Stored source refresh: 2026-09-16. Permit list: Stored source refresh: 2026-09-17. DUC list: No stored records are available in this view; this does not establish zero activity. The lists have separate coverage limits.
The primary counties recorded for Illinois Basin in Illinois are Crawford, White, Lawrence, Wayne, Peoria. Summary: Stored source refresh: 2026-09-16. Permit list: Stored source refresh: 2026-09-17. DUC list: No stored records are available in this view; this does not establish zero activity. The lists have separate coverage limits.
Value depends on your net mineral acres or royalty decimal, the operator, the remaining drilling locations, and current oil and gas prices. This page is informational only, not a valuation. Summary: Stored source refresh: 2026-09-16. Permit list: Stored source refresh: 2026-09-17. DUC list: No stored records are available in this view; this does not establish zero activity. The lists have separate coverage limits.
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Formation: Illinois Basin
State: Illinois
Total wells: 199,349
Recorded operators: 13,021
Permits 24mo: 502
Last refresh: 2026-09-16
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