Frontier Oil
Operator of record for 301 catalogued wells across 5 states. Every well below links to its full registry page.
Filed as: FRONTIER OIL CO · FRONTIER OIL CORP · Frontier Oil Co. · Frontier Oil Co., Inc. · …
At a glance
Frontier Oil is the operator of record for 301 catalogued U.S. oil & gas wells in 5 states. 2 (0.7%) are active, 269 (89%) plugged & abandoned and 4 flagged as orphaned. Its largest concentration is in Kansas, with 249 wells (83% of its portfolio).
Wells operated
301
Active
2
Plugged
269
Orphaned
4
Portfolio by state
| State | Wells |
|---|---|
| Kansas | 249 |
| Kentucky | 44 |
| Illinois | 5 |
| California | 2 |
| New Mexico | 1 |
Well mix
- Oil wells
- 62
- Gas wells
- 8
- Shut-in
- 0
- Active share
- 1%
Is this your company?
Claim Frontier Oil to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Frontier Oil operate?
Frontier Oil's catalogued wells are spread across 5 states: Kansas (249), Kentucky (44), Illinois (5), California (2) and New Mexico (1). Its 249 Kansas wells are 0.1% of the 473,140 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 Frontier Oil’s wells are active, plugged or orphaned?
0.7% of Frontier Oil's catalogued wells are active, 28 percentage points below the national share of 29%. 89% are plugged & abandoned, against 47% nationally. 4 wells filed under this name are flagged as orphaned — unplugged, with no operator able to plug them.
What kinds of wells does Frontier Oil operate?
By product class, 62 (21%) are oil wells and 8 (3%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is W. D. Arnold 'A' 1 in Clark, KS at 7,020 ft. The wells listed below sit in Clark (KS), Wallace (KS), Gray (KS), Comanche (KS) and Logan (KS). 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 Frontier Oil
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| W. D. Arnold 'A' 1 | 15-025-01001 | Plugged & abandoned | Other type | Clark, KS | Frontier Oil Company | 7,020 ft |
| Bouziden 1 | 15-025-20670 | Plugged & abandoned | Other type | Clark, KS | Frontier Oil Company | 5,500 ft |
| Burket 1 | 15-025-20680 | Plugged & abandoned | Other type | Clark, KS | Frontier Oil Company | 5,400 ft |
| Mills 1 | 15-199-20174 | Plugged & abandoned | Other type | Wallace, KS | Frontier Oil Company | 5,230 ft |
| Isaac 1 | 15-069-20228 | Plugged & abandoned | Other type | Gray, KS | Frontier Oil Company | 5,207 ft |
| Hufford 1 | 15-069-20229 | Plugged & abandoned | Other type | Gray, KS | Frontier Oil Company | 5,085 ft |
| Audrey 1 | 15-069-20233 | Plugged & abandoned | Other type | Gray, KS | Frontier Oil Company | 5,018 ft |
| Moeschl 3 | 15-069-20237 | Plugged & abandoned | Other type | Gray, KS | Frontier Oil Company | 5,000 ft |
| Einsel A 1 | 15-033-01003 | Plugged & abandoned | Other type | Comanche, KS | Frontier Oil Company | 4,963 ft |
| Moeschl 2 | 15-069-20236 | Plugged & abandoned | Other type | Gray, KS | Frontier Oil Company | 4,940 ft |
| Markel 1 | 15-069-20230 | Plugged & abandoned | Other type | Gray, KS | Frontier Oil Company | 4,845 ft |
| Clark 'A' 1 | 15-109-20475 | Plugged & abandoned | Oil | Logan, KS | Frontier Oil Company | 4,800 ft |
Deepest first where depth is published. See all 301 wells →
Frequently asked questions
How many wells does Frontier Oil operate?
Frontier Oil is the operator of record for 301 catalogued oil & gas wells, with the largest concentration in Kansas (249). Only wells in states WellCensus has ingested are counted.
How many of Frontier Oil's wells are still active?
2 of Frontier Oil's catalogued wells are active; 269 are plugged & abandoned and 4 are flagged as orphaned.
In which states does Frontier Oil operate wells?
Frontier Oil is the operator of record for wells in Kansas (249), Kentucky (44), Illinois (5), California (2) and New Mexico (1).
Does Frontier Oil operate mostly oil or gas wells?
62 of Frontier Oil's catalogued wells are oil wells and 8 are gas wells; the rest are injection, service or unclassified wells.
What is Frontier Oil's deepest well?
Among wells with a published depth, W. D. Arnold 'A' 1 in Clark, KS is the deepest at 7,020 ft.
Where Frontier Oil's wells are
- Oil & gas wells in Kansas· 249 operated by Frontier Oil
- Oil & gas wells in Kentucky· 44 operated by Frontier Oil
- Oil & gas wells in Illinois· 5 operated by Frontier Oil
- Oil & gas wells in California· 2 operated by Frontier Oil
- Oil & gas wells in New Mexico· 1 operated by Frontier 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, “Frontier Oil — well portfolio”, https://wellcensus.com/operators/frontier-oil-13348 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).