{
  "name": "Top Illinois Oil & Gas Operators by Wells Operated",
  "publisher": "Buckhead Energy",
  "url": "https://www.buckheadenergy.com/top-operators-illinois",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "doi": "https://doi.org/10.5281/zenodo.21442884",
  "dataAsOf": "2026-08-02",
  "count": 100,
  "operators": [
    {
      "rank": 1,
      "operatorSlug": "the-ohio-oil",
      "operatorName": "THE OHIO OIL",
      "wellCount": 10782,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "CRAWFORD",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 2,
      "operatorSlug": "marathon-oil-company",
      "operatorName": "MARATHON OIL COMPANY",
      "wellCount": 4529,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "LAWRENCE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 3,
      "operatorSlug": "the-texas-company",
      "operatorName": "THE TEXAS COMPANY",
      "wellCount": 4094,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "MARION",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 4,
      "operatorSlug": "pure-oil-company",
      "operatorName": "PURE OIL COMPANY",
      "wellCount": 3192,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "RICHLAND",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 5,
      "operatorSlug": "texaco",
      "operatorName": "TEXACO",
      "wellCount": 2427,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "MARION",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 6,
      "operatorSlug": "ohio-oil-company",
      "operatorName": "OHIO OIL COMPANY",
      "wellCount": 2180,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "CRAWFORD",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 7,
      "operatorSlug": "the-pure-oil-company",
      "operatorName": "THE PURE OIL COMPANY",
      "wellCount": 1947,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WAYNE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 8,
      "operatorSlug": "the-carter-oil",
      "operatorName": "THE CARTER OIL",
      "wellCount": 1812,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "FAYETTE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 9,
      "operatorSlug": "forest-oil",
      "operatorName": "FOREST OIL",
      "wellCount": 1678,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "CUMBERLAND",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 10,
      "operatorSlug": "magnolia-petroleum-company",
      "operatorName": "MAGNOLIA PETROLEUM COMPANY",
      "wellCount": 1605,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "MARION",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 11,
      "operatorSlug": "il-state-geological-survey",
      "operatorName": "IL STATE GEOLOGICAL SURVEY",
      "wellCount": 1557,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WILL",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 12,
      "operatorSlug": "national-associated-petroleum-company",
      "operatorName": "NATIONAL ASSOCIATED PETROLEUM COMPANY",
      "wellCount": 1556,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WHITE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 13,
      "operatorSlug": "shell-oil-company",
      "operatorName": "SHELL OIL COMPANY",
      "wellCount": 1483,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "HAMILTON",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 14,
      "operatorSlug": "tide-water-associated-oil-company",
      "operatorName": "TIDE WATER ASSOCIATED OIL COMPANY",
      "wellCount": 1419,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "CRAWFORD",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 15,
      "operatorSlug": "exxon-mobil-corporation",
      "operatorName": "EXXON MOBIL",
      "wellCount": 1299,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "FAYETTE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 16,
      "operatorSlug": "superior-oil-company",
      "operatorName": "SUPERIOR OIL COMPANY",
      "wellCount": 1278,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WHITE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 17,
      "operatorSlug": "union-oil-company-of-california",
      "operatorName": "UNION OIL COMPANY OF CALIFORNIA",
      "wellCount": 1217,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "CLAY",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 18,
      "operatorSlug": "carter-oil-company",
      "operatorName": "CARTER OIL COMPANY",
      "wellCount": 1206,
      "recentPermitCount": 0,
      "ducCount": 1,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "FAYETTE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 19,
      "operatorSlug": "brehm-c-e-drilling-producing",
      "operatorName": "BREHM C E DRILLING & PRODUCING",
      "wellCount": 1167,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WHITE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 20,
      "operatorSlug": "northern-illinois-gas-company",
      "operatorName": "NORTHERN ILLINOIS GAS COMPANY",
      "wellCount": 1116,
      "recentPermitCount": 5,
      "ducCount": 1,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "LIVINGSTON",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 21,
      "operatorSlug": "gulf-refining-company",
      "operatorName": "GULF REFINING COMPANY",
      "wellCount": 1010,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "CLINTON",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 22,
      "operatorSlug": "sun-production-co-sun-oil",
      "operatorName": "SUN PRODUCTION CO SUN OIL",
      "wellCount": 987,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WHITE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 23,
      "operatorSlug": "phillips-petroleum-company",
      "operatorName": "PHILLIPS PETROLEUM COMPANY",
      "wellCount": 964,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WHITE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 24,
      "operatorSlug": "associated-oil-production-company",
      "operatorName": "ASSOCIATED OIL PRODUCTION COMPANY",
      "wellCount": 845,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "CRAWFORD",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 25,
      "operatorSlug": "campbell-energy",
      "operatorName": "CAMPBELL ENERGY",
      "wellCount": 808,
      "recentPermitCount": 34,
      "ducCount": 3,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WHITE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 26,
      "operatorSlug": "mahutska-oil-company",
      "operatorName": "MAHUTSKA OIL COMPANY",
      "wellCount": 780,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "CRAWFORD",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 27,
      "operatorSlug": "the-texas",
      "operatorName": "THE TEXAS",
      "wellCount": 774,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "MARION",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 28,
      "operatorSlug": "petco-petroleum",
      "operatorName": "PETCO PETROLEUM",
      "wellCount": 764,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "FAYETTE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 29,
      "operatorSlug": "natural-gas-pipeline-co-of-america",
      "operatorName": "NATURAL GAS PIPELINE CO OF AMERICA",
      "wellCount": 738,
      "recentPermitCount": 12,
      "ducCount": 2,
      "producingWellCount": 0,
      "topFormation": "Wisconsin Arch",
      "topCounty": "KANKAKEE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 30,
      "operatorSlug": "mcbride-w-c",
      "operatorName": "MCBRIDE W C",
      "wellCount": 719,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "LAWRENCE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 31,
      "operatorSlug": "zanetisjohn-mestate-of",
      "operatorName": "ZANETISJOHN MESTATE OF",
      "wellCount": 706,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "JASPER",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 32,
      "operatorSlug": "alco-oil-gas",
      "operatorName": "ALCO OIL & GAS",
      "wellCount": 686,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "HENDERSON",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 33,
      "operatorSlug": "citation-oil-gas-corp",
      "operatorName": "CITATION OIL & GAS",
      "wellCount": 679,
      "recentPermitCount": 54,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "MARION",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 34,
      "operatorSlug": "calvert-drilling",
      "operatorName": "CALVERT DRILLING",
      "wellCount": 675,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "RICHLAND",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 35,
      "operatorSlug": "ashland-oil-refining",
      "operatorName": "ASHLAND OIL & REFINING",
      "wellCount": 672,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "CRAWFORD",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 36,
      "operatorSlug": "bipetro",
      "operatorName": "BIPETRO",
      "wellCount": 647,
      "recentPermitCount": 30,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "MC DONOUGH",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 37,
      "operatorSlug": "c-e-brehm-drilling-production",
      "operatorName": "C E BREHM DRILLING & PRODUCTION",
      "wellCount": 619,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "HAMILTON",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 38,
      "operatorSlug": "southern-community",
      "operatorName": "Southern Community",
      "wellCount": 586,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WABASH",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 39,
      "operatorSlug": "vickery-drilling",
      "operatorName": "VICKERY DRILLING",
      "wellCount": 579,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Wisconsin Arch",
      "topCounty": "LA SALLE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 40,
      "operatorSlug": "kingwood-oil-company",
      "operatorName": "KINGWOOD OIL COMPANY",
      "wellCount": 578,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "HAMILTON",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 41,
      "operatorSlug": "r-k-petroleum-corp",
      "operatorName": "R K PETROLEUM",
      "wellCount": 565,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WHITE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 42,
      "operatorSlug": "george-wrather-oil",
      "operatorName": "GEORGE & WRATHER OIL",
      "wellCount": 547,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WABASH",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 43,
      "operatorSlug": "collins-brothers-oil-company",
      "operatorName": "COLLINS BROTHERS OIL COMPANY",
      "wellCount": 545,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "HAMILTON",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 44,
      "operatorSlug": "duncan-walter",
      "operatorName": "DUNCAN WALTER",
      "wellCount": 542,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "COLES",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 45,
      "operatorSlug": "granholm-assoc",
      "operatorName": "GRANHOLM & ASSOC",
      "wellCount": 540,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "MONTGOMERY",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 46,
      "operatorSlug": "illinois-state-geological-survey",
      "operatorName": "ILLINOIS STATE GEOLOGICAL SURVEY",
      "wellCount": 536,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "COOK",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 47,
      "operatorSlug": "christa-oil-company",
      "operatorName": "CHRISTA OIL COMPANY",
      "wellCount": 527,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "CRAWFORD",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 48,
      "operatorSlug": "oelze-elmer-jr",
      "operatorName": "OELZE ELMER JR",
      "wellCount": 519,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WASHINGTON",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 49,
      "operatorSlug": "shakespeare-oil",
      "operatorName": "SHAKESPEARE OIL",
      "wellCount": 516,
      "recentPermitCount": 0,
      "ducCount": 1,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WAYNE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 50,
      "operatorSlug": "illinois-power-company",
      "operatorName": "ILLINOIS POWER COMPANY",
      "wellCount": 511,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "ST CLAIR",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 51,
      "operatorSlug": "skiles-oil",
      "operatorName": "SKILES OIL",
      "wellCount": 510,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "CRAWFORD",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 52,
      "operatorSlug": "crete-oil-investments",
      "operatorName": "CRETE OIL INVESTMENTS",
      "wellCount": 506,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "CRAWFORD",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 53,
      "operatorSlug": "hydrocarbon-survey",
      "operatorName": "HYDROCARBON SURVEY",
      "wellCount": 504,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "HENRY",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 54,
      "operatorSlug": "fulk-perry",
      "operatorName": "FULK PERRY",
      "wellCount": 504,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "RICHLAND",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 55,
      "operatorSlug": "sohio-petroleum-company",
      "operatorName": "SOHIO PETROLEUM COMPANY",
      "wellCount": 499,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "MARION",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 56,
      "operatorSlug": "hf-sinclair-corporation",
      "operatorName": "HF Sinclair Corporation",
      "wellCount": 477,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WHITE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 57,
      "operatorSlug": "elysium-energy",
      "operatorName": "ELYSIUM ENERGY",
      "wellCount": 477,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WHITE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 58,
      "operatorSlug": "gallagher-victor-r",
      "operatorName": "GALLAGHER VICTOR R",
      "wellCount": 436,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "FRANKLIN",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 59,
      "operatorSlug": "pioneer-oil",
      "operatorName": "PIONEER OIL",
      "wellCount": 428,
      "recentPermitCount": 10,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "CRAWFORD",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 60,
      "operatorSlug": "farrar-oil",
      "operatorName": "FARRAR OIL",
      "wellCount": 423,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "FRANKLIN",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 61,
      "operatorSlug": "gulf-oil",
      "operatorName": "GULF OIL",
      "wellCount": 422,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WHITE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 62,
      "operatorSlug": "coy-oil",
      "operatorName": "COY OIL",
      "wellCount": 418,
      "recentPermitCount": 0,
      "ducCount": 0,
      "producingWellCount": 0,
      "topFormation": "Illinois Basin",
      "topCounty": "WHITE",
      "dataAsOf": "2026-08-02"
    },
    {
      "rank": 63,
      "operatorSlug": "the-nation-oil-company",
      "operatorName": "THE NATION OIL COMPANY",
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  ]
}