Mason Oil
Operator of record for 172 catalogued wells across 3 states. Every well below links to its full registry page.
Filed as: MASON OIL CO · MASON OIL COMPANY · MASON OIL COMPANY INC · MASON OIL INC · …
At a glance
Mason Oil is the operator of record for 172 catalogued U.S. oil & gas wells in 3 states. 25 (15%) are active, 116 (67%) plugged & abandoned and 6 flagged as orphaned. Its largest concentration is in Illinois, with 135 wells (78% of its portfolio).
Wells operated
172
Active
25
Plugged
116
Orphaned
6
Portfolio by state
| State | Wells |
|---|---|
| Illinois | 135 |
| Oklahoma | 21 |
| Kentucky | 16 |
Well mix
- Oil wells
- 91
- Gas wells
- 1
- Shut-in
- 1
- Active share
- 15%
Is this your company?
Claim Mason Oil to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Mason Oil operate?
Mason Oil's catalogued wells are spread across 3 states: Illinois (135), Oklahoma (21) and Kentucky (16). Its 135 Illinois wells are 0.1% 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 Mason Oil’s wells are active, plugged or orphaned?
15% of Mason Oil's catalogued wells are active, 14 percentage points below the national share of 29%. 67% are plugged & abandoned, against 47% nationally. 1 wells (0.6%) are shut-in — unplugged but idle. 6 wells filed under this name are flagged as orphaned — unplugged, with no operator able to plug them.
What kinds of wells does Mason Oil operate?
By product class, 91 (53%) are oil wells and 1 (0.6%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is Swick, Ray 1 in Cumberland, IL at 4,810 ft. The wells listed below sit in Cumberland (IL), Jasper (IL), Lawrence (IL), Richland (IL) and Clay (IL). State filings spell the name 5 ways; WellCensus merges exact-normalized spellings only, so subsidiaries and affiliates keep their own pages.
Notable wells operated by Mason Oil
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Swick, Ray 1 | 12-035-22134 | Plugged & abandoned | Other type | Cumberland, IL | Mason Oil Company | 4,810 ft |
| Hammer, Robert 1 | 12-079-23332 | Plugged & abandoned | Oil | Jasper, IL | Mason Oil Company | 4,400 ft |
| Barkley 1 | 12-035-22140 | Plugged & abandoned | Other type | Cumberland, IL | Mason Oil Company | 4,360 ft |
| Buckler, C. 1 | 12-079-23605 | Plugged & abandoned | Oil | Jasper, IL | Mason Oil Company | 4,329 ft |
| Dillier, Harold 1 | 12-035-22138 | Plugged & abandoned | Other type | Cumberland, IL | Mason Oil Company | 4,312 ft |
| Cassil, John 1 | 12-101-27805 | Plugged & abandoned | Injection | Lawrence, IL | Mason Oil Company | 3,391 ft |
| Bursott-Hawkins Com 1 | 12-159-23896 | Plugged & abandoned | Oil | Richland, IL | Mason Oil Company | 3,200 ft |
| Bursott-Hawkins Comm. 2 | 12-159-23897 | Plugged & abandoned | Oil | Richland, IL | Mason Oil Company | 3,198 ft |
| Ernest, T. A. 2 | 12-079-02067 | Plugged & abandoned | Other type | Jasper, IL | Mason Oil Company | 3,177 ft |
| Hasler, Ira 1 | 12-025-26047 | Plugged & abandoned | Oil | Clay, IL | Mason Oil Company | 3,092 ft |
| Sowers 1 | 12-079-23578 | Plugged & abandoned | Other type | Jasper, IL | Mason Oil Company | 3,050 ft |
| Correll 1-A | 12-159-23909 | Plugged & abandoned | Other type | Richland, IL | Mason Oil Company | 3,040 ft |
Deepest first where depth is published. See all 172 wells →
Frequently asked questions
How many wells does Mason Oil operate?
Mason Oil is the operator of record for 172 catalogued oil & gas wells, with the largest concentration in Illinois (135). Only wells in states WellCensus has ingested are counted.
How many of Mason Oil's wells are still active?
25 of Mason Oil's catalogued wells are active; 116 are plugged & abandoned and 6 are flagged as orphaned.
In which states does Mason Oil operate wells?
Mason Oil is the operator of record for wells in Illinois (135), Oklahoma (21) and Kentucky (16).
Does Mason Oil operate mostly oil or gas wells?
91 of Mason Oil's catalogued wells are oil wells and 1 are gas wells; the rest are injection, service or unclassified wells.
What is Mason Oil's deepest well?
Among wells with a published depth, Swick, Ray 1 in Cumberland, IL is the deepest at 4,810 ft.
Where Mason Oil's wells are
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, “Mason Oil — well portfolio”, https://wellcensus.com/operators/mason-oil-7793 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).