Mar Oil
Operator of record for 13 catalogued wells across 2 states. Every well below links to its full registry page.
Filed as: MAR OIL COMPANY · Mar Oil Co.
At a glance
Mar Oil is the operator of record for 13 catalogued U.S. oil & gas wells in 2 states. 9 (69%) are active, 3 (23%) plugged & abandoned. Its largest concentration is in Ohio, with 12 wells (92% of its portfolio).
Wells operated
13
Active
9
Plugged
3
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| Ohio | 12 |
| Illinois | 1 |
Well mix
- Oil wells
- 12
- Gas wells
- 0
- Shut-in
- 0
- Active share
- 69%
Is this your company?
Claim Mar Oil to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Mar Oil operate?
Mar Oil's catalogued wells are spread across 2 states: Ohio (12) and Illinois (1). Its 12 Ohio wells are 0.0% of the 242,052 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 Mar Oil’s wells are active, plugged or orphaned?
69% of Mar Oil's catalogued wells are active, 40 percentage points above the national share of 29%. 23% are plugged & abandoned, against 47% nationally. None of the wells filed under this name is flagged as orphaned.
What kinds of wells does Mar Oil operate?
By product class, 12 (92%) are oil wells and 0 (0%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is Hackworth 2 Hz in Wyandot, OH at 3,534 ft. The wells listed below sit in Wyandot (OH), Marion (OH) and Lawrence (IL). State filings spell the name 2 ways; WellCensus merges exact-normalized spellings only, so subsidiaries and affiliates keep their own pages.
Notable wells operated by Mar Oil
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Hackworth 2 Hz | 34-175-20368 | Active | Oil | Wyandot, OH | Mar Oil Company | 3,534 ft |
| Roszman 1-H | 34-101-20220 | Active | Oil | Marion, OH | Mar Oil Company | 3,288 ft |
| Hensel 1 | 34-175-20336 | Active | Oil | Wyandot, OH | Mar Oil Company | 2,833 ft |
| Doornbos 1 | 34-101-20210 | Active | Oil | Marion, OH | Mar Oil Company | 2,035 ft |
| Leslie 1 | 34-175-20339 | Plugged & abandoned | Oil | Wyandot, OH | Mar Oil Company | 2,027 ft |
| Roszman 1 | 34-101-20208 | Active | Oil | Marion, OH | Mar Oil Company | 1,982 ft |
| Annabelle 1 | 34-175-20345 | Plugged & abandoned | Oil | Wyandot, OH | Mar Oil Company | 1,960 ft |
| Born(Swiw #3) 1 | 34-175-20341 | Active | Injection | Wyandot, OH | Mar Oil Company | 1,771 ft |
| Hazel 1 | 34-175-20346 | Plugged & abandoned | Oil | Wyandot, OH | Mar Oil Company | 1,720 ft |
| Mar Oil 1 | 34-101-20215 | Active | Oil | Marion, OH | Mar Oil Company | 1,419 ft |
| Hackworth 1 | 34-175-20340 | Active | Oil | Wyandot, OH | Mar Oil Company | 1,410 ft |
| Kerr, J. B. Jr. | 12-101-07798 | Active | Oil | Lawrence, IL | Mar Oil Co. | 982 ft |
Deepest first where depth is published. See all 13 wells →
Frequently asked questions
How many wells does Mar Oil operate?
Mar Oil is the operator of record for 13 catalogued oil & gas wells, with the largest concentration in Ohio (12). Only wells in states WellCensus has ingested are counted.
How many of Mar Oil's wells are still active?
9 of Mar Oil's catalogued wells are active; 3 are plugged & abandoned.
In which states does Mar Oil operate wells?
Mar Oil is the operator of record for wells in Ohio (12) and Illinois (1).
Does Mar Oil operate mostly oil or gas wells?
12 of Mar Oil's catalogued wells are oil wells and 0 are gas wells; the rest are injection, service or unclassified wells.
What is Mar Oil's deepest well?
Among wells with a published depth, Hackworth 2 Hz in Wyandot, OH is the deepest at 3,534 ft.
Where Mar 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, “Mar Oil — well portfolio”, https://wellcensus.com/operators/mar-oil-86125 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).