Duncan Walter
Operator of record for 520 catalogued wells across 5 states. Every well below links to its full registry page.
Filed as: DUNCAN WALTER · DUNCAN, WALTER · Duncan, Walter · Duncan, Walter Inc.
At a glance
Duncan Walter is the operator of record for 520 catalogued U.S. oil & gas wells in 5 states. 75 (14%) are active, 414 (80%) plugged & abandoned and 7 flagged as orphaned. Its largest concentration is in Illinois, with 347 wells (67% of its portfolio).
Wells operated
520
Active
75
Plugged
414
Orphaned
7
Portfolio by state
| State | Wells |
|---|---|
| Illinois | 347 |
| Kentucky | 88 |
| Oklahoma | 80 |
| Wyoming | 3 |
| Montana | 2 |
Well mix
- Oil wells
- 235
- Gas wells
- 7
- Shut-in
- 2
- Active share
- 14%
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Claim your operator profileWhere does Duncan Walter operate?
Duncan Walter's catalogued wells are spread across 5 states: Illinois (347), Kentucky (88), Oklahoma (80), Wyoming (3) and Montana (2). Its 347 Illinois wells are 0.2% of the 174,478 catalogued in that state — its largest share of any state. Counts cover only states whose registries WellCensus has ingested with operator names; wells in Nebraska and Texas (location indexes) and in states without a registry ingest are not yet attributed to any operator.
How many of Duncan Walter’s wells are active, plugged or orphaned?
14% of Duncan Walter's catalogued wells are active, 14 percentage points below the national share of 29%. 80% are plugged & abandoned, against 47% nationally. 2 wells (0.4%) are shut-in — unplugged but idle. 7 wells filed under this name are flagged as orphaned — unplugged, with no operator able to plug them.
What kinds of wells does Duncan Walter operate?
By product class, 235 (45%) are oil wells and 7 (1%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is Federal 1-4 in Campbell, WY at 8,950 ft. The wells listed below sit in Campbell (WY), Powder River (MT), Hill (MT), Union (KY), Hamilton (IL) and Webster (KY) and other counties. State filings spell the name 4 ways; WellCensus merges exact-normalized spellings only, so subsidiaries and affiliates keep their own pages.
Notable wells operated by Duncan Walter
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Federal 1-4 | 49-005-22648 | Plugged & abandoned | Oil | Campbell, WY | Duncan Walter | 8,950 ft |
| Imperial Am Patented 1 | 49-005-21452 | Plugged & abandoned | Oil | Campbell, WY | Duncan Walter | 8,087 ft |
| Johnson Pet Patented 1 | 49-005-22531 | Plugged & abandoned | Oil | Campbell, WY | Duncan Walter | 8,084 ft |
| Warner 1 | 25-075-21812 | Plugged & abandoned | Other type | Powder River, MT | Duncan, Walter | 5,420 ft |
| Hansen 1 | 25-041-21302 | Plugged & abandoned | Other type | Hill, MT | Duncan, Walter | 4,143 ft |
| Proctor, C S 1 | KGS record 2038865 | Plugged & abandoned | Other type | Union, KY | Duncan, Walter | 3,720 ft |
| Martin Grace Charlie 1 | 12-065-01006 | Plugged & abandoned | Other type | Hamilton, IL | Duncan, Walter | 3,580 ft |
| Hanagan 1 | 12-065-00629 | Plugged & abandoned | Other type | Hamilton, IL | Duncan, Walter | 3,558 ft |
| Swain, Mary C 1 | 16-233-02098 | Plugged & abandoned | Other type | Webster, KY | Duncan, Walter | 3,516 ft |
| Smith Heirs 1 | 12-065-01948 | Plugged & abandoned | Other type | Hamilton, IL | Duncan, Walter | 3,495 ft |
| U.S. Steel Corp. - Kearney 1 | 12-055-01309 | Plugged & abandoned | Other type | Franklin, IL | Duncan, Walter | 3,479 ft |
| Wasson H E 1 | 12-047-00895 | Plugged & abandoned | Oil | Edwards, IL | Duncan, Walter | 3,450 ft |
Deepest first where depth is published. See all 520 wells →
Frequently asked questions
How many wells does Duncan Walter operate?
Duncan Walter is the operator of record for 520 catalogued oil & gas wells, with the largest concentration in Illinois (347). Only wells in states WellCensus has ingested are counted.
How many of Duncan Walter's wells are still active?
75 of Duncan Walter's catalogued wells are active; 414 are plugged & abandoned and 7 are flagged as orphaned.
In which states does Duncan Walter operate wells?
Duncan Walter is the operator of record for wells in Illinois (347), Kentucky (88), Oklahoma (80), Wyoming (3) and Montana (2).
Does Duncan Walter operate mostly oil or gas wells?
235 of Duncan Walter's catalogued wells are oil wells and 7 are gas wells; the rest are injection, service or unclassified wells.
What is Duncan Walter's deepest well?
Among wells with a published depth, Federal 1-4 in Campbell, WY is the deepest at 8,950 ft.
Where Duncan Walter's wells are
- Oil & gas wells in Illinois· 347 operated by Duncan Walter
- Oil & gas wells in Kentucky· 88 operated by Duncan Walter
- Oil & gas wells in Oklahoma· 80 operated by Duncan Walter
- Oil & gas wells in Wyoming· 3 operated by Duncan Walter
- Oil & gas wells in Montana· 2 operated by Duncan Walter
- Largest U.S. well operators
- All well operators
About this data
Source: State oil & gas regulator registries (operator of record as filed, exact-normalized across states) plus the USGS United States Documented Orphaned Well Database (2026), as published October 10, 2026 — WellCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: WellCensus, “Duncan Walter — well portfolio”, https://wellcensus.com/operators/duncan-walter-40 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).