Union Oil
Operator of record for 152 catalogued wells across 5 states. Every well below links to its full registry page.
Filed as: UNION OIL · UNION OIL CO · UNION OIL COMPANY · Union Oil Company
At a glance
Union Oil is the operator of record for 152 catalogued U.S. oil & gas wells in 5 states. 9 (6%) are active, 35 (23%) plugged & abandoned and 3 flagged as orphaned. Its largest concentration is in Michigan, with 98 wells (64% of its portfolio).
Wells operated
152
Active
9
Plugged
35
Orphaned
3
Portfolio by state
| State | Wells |
|---|---|
| Michigan | 98 |
| Kentucky | 26 |
| Ohio | 24 |
| California | 2 |
| Kansas | 2 |
Well mix
- Oil wells
- 34
- Gas wells
- 1
- Shut-in
- 0
- Active share
- 6%
Is this your company?
Claim Union Oil to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Union Oil operate?
Union Oil's catalogued wells are spread across 5 states: Michigan (98), Kentucky (26), Ohio (24), California (2) and Kansas (2). Its 98 Michigan wells are 0.1% of the 85,673 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 Union Oil’s wells are active, plugged or orphaned?
6% of Union Oil's catalogued wells are active, 23 percentage points below the national share of 29%. 23% are plugged & abandoned, against 47% nationally. 3 wells filed under this name are flagged as orphaned — unplugged, with no operator able to plug them.
What kinds of wells does Union Oil operate?
By product class, 34 (22%) are oil wells and 1 (0.7%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is Latham, Thomas E 2 in Isabella, MI at 4,994 ft. The wells listed below sit in Isabella (MI) and Clare (MI). 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 Union Oil
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Latham, Thomas E 2 | 21-073-03946 | Plugged & abandoned | Other type | Isabella, MI | Union Oil Co | 4,994 ft |
| Wille, Stanley E 10 | 21-073-04594 | Other status | Other type | Isabella, MI | Union Oil Co | 4,031 ft |
| Douglas, Bert 1 | 21-035-05501 | Other status | Other type | Clare, MI | Union Oil Co | 3,931 ft |
| Switzer, Berten E 2-A | 21-035-05666 | Other status | Other type | Clare, MI | Union Oil Co | 3,913 ft |
| Bicknell, James S 1-D | 21-035-05506 | Other status | Other type | Clare, MI | Union Oil Co | 3,912 ft |
| Switzer, Floyd O 2 | 21-035-05570 | Other status | Other type | Clare, MI | Union Oil Co | 3,911 ft |
| Switzer, Floyd O 3 | 21-035-05640 | Other status | Other type | Clare, MI | Union Oil Co | 3,908 ft |
| Switzer, Berten E 3-A | 21-035-05667 | Other status | Other type | Clare, MI | Union Oil Co | 3,908 ft |
| Switzer, Bertene 1 | 21-035-05159 | Plugged & abandoned | Other type | Clare, MI | Union Oil Co | 3,908 ft |
| Switzer, Floyd O 1 | 21-035-05465 | Plugged & abandoned | Other type | Clare, MI | Union Oil Co | 3,906 ft |
| Bicknell, James S 4-B | 21-035-05665 | Other status | Other type | Clare, MI | Union Oil Co | 3,903 ft |
| Austin, A & Henry, H 1 | 21-035-05569 | Other status | Other type | Clare, MI | Union Oil Co | 3,901 ft |
Deepest first where depth is published. See all 152 wells →
Frequently asked questions
How many wells does Union Oil operate?
Union Oil is the operator of record for 152 catalogued oil & gas wells, with the largest concentration in Michigan (98). Only wells in states WellCensus has ingested are counted.
How many of Union Oil's wells are still active?
9 of Union Oil's catalogued wells are active; 35 are plugged & abandoned and 3 are flagged as orphaned.
In which states does Union Oil operate wells?
Union Oil is the operator of record for wells in Michigan (98), Kentucky (26), Ohio (24), California (2) and Kansas (2).
Does Union Oil operate mostly oil or gas wells?
34 of Union Oil's catalogued wells are oil wells and 1 are gas wells; the rest are injection, service or unclassified wells.
What is Union Oil's deepest well?
Among wells with a published depth, Latham, Thomas E 2 in Isabella, MI is the deepest at 4,994 ft.
Where Union Oil's wells are
- Oil & gas wells in Michigan· 98 operated by Union Oil
- Oil & gas wells in Kentucky· 26 operated by Union Oil
- Oil & gas wells in Ohio· 24 operated by Union Oil
- Oil & gas wells in California· 2 operated by Union Oil
- Oil & gas wells in Kansas· 2 operated by Union Oil
- 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, “Union Oil — well portfolio”, https://wellcensus.com/operators/union-oil-9716 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).