Starr County, Texas
Oil and gas wells in and near ZIP code 78591
- 411wells inside the ZIP
- 864within 3 miles of it
- 8drilling locations in two years
- 176square miles of land
The ZIP code and 3 miles around it
Wells and drilling locations in and around 78591
- Drilling locations8Permits issued in the last two years
- Producing wells392On a lease reporting production now
- Not producing349Shut in, inactive or no lease on record
- Plugged123The state's wellbore record says plugged
The solid line is ZIP code 78591 as the US Census Bureau draws it; the dashed line is 3 miles out. The counts are for everything inside the dashed line: 411 of the wells are inside the ZIP itself. Sources: Railroad Commission of Texas well layers and permit files, US Census Bureau ZIP Code Tabulation Areas and county outlines, town points from GeoNames (CC BY 4.0), base map from USGS The National Map.
Use this map on your site
You may show this map on any site, unchanged. Keep the credit line and its link to Royalty Clerk under the map. The picture updates by itself as the state records new wells and permits.
<a href="https://royaltyclerk.com/texas/zip/78591"><img src="https://royaltyclerk.com/maps/zip/78591.svg" alt="Map of ZIP code 78591, Texas, outlined, with 411 oil and gas wells inside it and 864 within 3 miles of its edge as dots, and 8 drilling locations permitted in two years." width="1000" height="1099" loading="lazy" style="max-width:100%;height:auto;border:0"></a>
<p style="margin:4px 0 0;font-size:14px">Map: <a href="https://royaltyclerk.com/texas/zip/78591">Oil and gas wells in ZIP code 78591, Texas</a> by Royalty Clerk, from Railroad Commission of Texas records</p>In numbers
Wells in 78591 and within 3 miles
| What | Inside 78591 | Within 3 miles |
|---|---|---|
| Producing wells | 201 | 392 |
| Not producing wells | 161 | 349 |
| Plugged wells | 49 | 123 |
| Drilling permits, last 24 months | 7 | 8 |
| All wells | 411 | 864 |
ZIP code 78591 covers 176 square miles of land and 0.2 of water: about 2.3 wells to the square mile.
Drilling locations
The newest drilling permits in and near 78591
| Issued | Lease and well | Where | Operator |
|---|---|---|---|
| 2026-03-27 | MONTALVO, N. R. 62vertical · API 42-427-34817 · permit 0914356Triad O&G, LLC | in 7859126.67918, -98.49749 on OpenStreetMap (opens in a new tab) | Triad O&G, LLC |
| 2026-02-20 | I.V. MONTALVO 'A' 20vertical · API 42-427-34762 · permit 0913510Killam Oil Co., Ltd. | in 7859126.68136, -98.49290 on OpenStreetMap (opens in a new tab) | Killam Oil Co., Ltd. |
| 2025-10-20 | I.V. MONTALVO 'C' 49vertical · API 42-427-34736 · permit 0911186Killam Oil Co., Ltd. | in 7859126.70549, -98.48194 on OpenStreetMap (opens in a new tab) | Killam Oil Co., Ltd. |
| 2025-10-20 | I.V. MONTALVO 'C' 58vertical · API 42-427-34743 · permit 0911185Killam Oil Co., Ltd. | 0.0 mi outside26.70747, -98.47911 on OpenStreetMap (opens in a new tab) | Killam Oil Co., Ltd. |
| 2025-05-01 | HALL, J. F. STATE 30vertical · API 42-427-34791 · permit 0907671Killam Oil Co., Ltd. | in 7859126.61968, -98.52751 on OpenStreetMap (opens in a new tab) | Killam Oil Co., Ltd. |
| 2025-03-07 | MONTALVO, N. R. 62vertical · API 42-427-34817 · permit 0906366Triad O&G, LLC | in 7859126.67918, -98.49749 on OpenStreetMap (opens in a new tab) | Triad O&G, LLC |
| 2025-03-03 | MONTALVO, N. R. 62vertical · API 42-427-34817 · permit 0906294Triad O&G, LLC | in 7859126.67918, -98.49749 on OpenStreetMap (opens in a new tab) | Triad O&G, LLC |
| 2025-01-09 | BENTSEN BROS. - STATE 12vertical · API 42-427-33918 · permit 0904745Merit Energy Company | in 7859126.56431, -98.50987 on OpenStreetMap (opens in a new tab) | Merit Energy Company |
| 2024-08-19 | I.V. MONTALVO 'C' 55vertical · API 42-427-34739 · permit 0902050Killam Oil Co., Ltd. | 0.1 mi outside26.69967, -98.48055 on OpenStreetMap (opens in a new tab) | Killam Oil Co., Ltd. |
| 2024-08-08 | I.V. MONTALVO 'C' 56vertical · API 42-427-34767 · permit 0901825Killam Oil Co., Ltd. | in 7859126.69630, -98.48834 on OpenStreetMap (opens in a new tab) | Killam Oil Co., Ltd. |
| 2024-07-11 | I.V. MONTALVO 'A' 20vertical · API 42-427-34762 · permit 0901123Killam Oil Co., Ltd. | in 7859126.68136, -98.49290 on OpenStreetMap (opens in a new tab) | Killam Oil Co., Ltd. |
| 2024-06-07 | SLICK ESTATE 2vertical · API 42-427-34818 · permit 0900202Royal Production Company, Inc. | 0.3 mi outside26.53657, -98.54702 on OpenStreetMap (opens in a new tab) | Royal Production Company, Inc. |
| 2024-05-31 | BLOCK, E. HEIRS 'B' 4vertical · API 42-427-33060 · permit 0899782Osborn,w.b. Oil & Gas Operations | in 7859126.69659, -98.53340 on OpenStreetMap (opens in a new tab) | Osborn,w.b. Oil & Gas Operations |
| 2024-05-07 | SLICK 1vertical · API 42-427-34808 · permit 0899417Royal Production Company, Inc. | 2.4 mi outside26.48362, -98.56238 on OpenStreetMap (opens in a new tab) | Royal Production Company, Inc. |
| 2024-02-08 | MONTALVO, N. R. 62vertical · API 42-427-34817 · permit 0897026Triad O&G, LLC | in 7859126.67918, -98.49749 on OpenStreetMap (opens in a new tab) | Triad O&G, LLC |
A permit is permission to drill, not a well. Source: Railroad Commission of Texas drilling permits. This week's permits, statewide
Nearest wells
The wells nearest the middle of 78591
- 1Hall, C. M. 170.7 mi SENot producing · API 42-427-32502 · Killam Oil Co., Ltd. · inside 78591
- 2Hall, C. M. 180.8 mi SEProducing · API 42-427-32803 · Killam Oil Co., Ltd. · inside 78591
- 3Hall, C. M. 160.9 mi SNot producing · API 42-427-32364 · Killam Oil Co., Ltd. · inside 78591
- 4Gonzalez, Osbelia Saenz Et Al 11.0 mi ENot producing · API 42-427-32963 · L & B Oil and Gas Equipment, LLC
- 5Hall, C. M. 191.0 mi SENot producing · API 42-427-34645 · Killam Oil Co., Ltd.
- 6Hall, J.f. State 231.2 mi SNot producing · API 42-427-32258 · Killam Oil Co., Ltd. · inside 78591
Who runs them
Operators of the wells in 78591
- 1Merit Energy Company187 wells137 on producing leases
- 2Killam Oil Co., Ltd.71 wells19 on producing leases
- 3Wagner Oil Company46 wells22 on producing leases
- 4Hilcorp Energy Company34 wells19 on producing leases
- 5Orx Resources, L.L.C.16 wells4 on producing leases
- 6Scorpion Operating, Inc.12 wellsnone on a producing lease
- 7Lakeshore Operating, LLC7 wells6 on producing leases
- 8Triad O&G, LLC6 wellsnone on a producing lease
Around it
Towns and ZIP codes around 78591
FAQ
Questions people ask
Are there oil or gas wells near 78591?
Yes. 411 oil and gas wells with a location on the state's map lie inside ZIP code 78591, 201 of them on producing leases, and 864 within 3 miles of its edge. The state issued 8 drilling permits with a well location within 3 miles in the last 24 months, the newest on March 27, 2026.
Is this the same area as the Postal Service's ZIP code?
Nearly. The Postal Service does not publish ZIP code boundaries, so we use the US Census Bureau's ZIP Code Tabulation Area for 78591, built from census blocks where most addresses use that ZIP. The edges can differ from mail delivery by a street or two, and a few ZIP codes (post office boxes, single buildings) have no area of their own.
Do I own minerals under a well in 78591?
A well nearby says nothing about who owns the minerals under it. The county's mineral roll lists who is paid on each producing lease. Search a name to see whether the Starr County roll lists it.
Where do the numbers come from?
Every dot is a well location from the Railroad Commission of Texas well layers, or a drilling permit's surface location from its permit files, issued in the last 24 months. A well counts as producing when its lease reported oil or gas in its newest months, and as plugged when the state's wellbore record says so. Nothing on this page comes from owners or from addresses.
Own land or minerals near 78591?
See whether a county roll lists your name, and get an email when a permit or a new well is filed near you.
Sources
- US Census Bureau, 2020 ZIP Code Tabulation Areas, cartographic boundary file at 1:500,000 (cb_2020_us_zcta520_500k)www2.census.gov/geo/tiger/GENZ2020/shp/cb_2020_us_zcta520_500k.zip · file of May 19, 2023, read November 14, 2026
- Railroad Commission of Texas, well layers and drilling permit fileswww.rrc.texas.gov/resource-center/research/data-sets-available-for-download/ · loaded as the state publishes them; figures kept six hours
- US Census Bureau, cartographic boundary files (county lines), through the us-atlas package 3.0.1www.census.gov/geographies/mapping-files/time-series/geo/cartographic-boundary.html · built into the site with its well maps
- GeoNames, towns and their points (CC BY 4.0)www.geonames.org/ · built into the site with its town pages
- USGS The National Map, basemap services (topo and imagery map under the wells), public domainapps.nationalmap.gov/services/ · tiles drawn under the map when it is made