What is the deepest oil or gas well catalogued on WellCensus?

Ha Ra Suaa;crdl 9&28-16-14hc 004-Alt in Caddo County, LA reports the greatest published depth: 35,000 ft (measured depth — long horizontal laterals rank high).

Which states publish well depth data?

Depth figures currently come from Kansas, Ohio, Louisiana, Kentucky, Illinois, New Mexico, Wyoming, Colorado, Michigan, New York, North Dakota, Montana, Mississippi, Arkansas, Alabama — states whose registries publish total/measured depth. Depths above 35,000 ft are treated as source errors and excluded.

Deepest wells in America

The 100 deepest catalogued wellbores by published total/measured depth. Depth coverage is honest-but-partial: only KS, OH, LA, KY, IL, NM, WY, CO, MI, NY, ND, MT, MS, AR, AL publish depth today (Oklahoma and California do not), and modern horizontal laterals rank by measured — not vertical — depth. See methodology.

Dataset updated July 2026 . Derived from public data sources.

100 deepest catalogued U.S. oil & gas wells by published depth
Well	API #	Status	Type	Location	Operator	Depth
Ha Ra Suaa;crdl 9&28-16-14hc 004-Alt	17-017-37056	Other status	Other type	Caddo, LA	Apex Natural Gas, LLC	35,000 ft
Farms 19&6-10-10hc 003	17-069-20556	Other status	Other type	Natchitoches, LA	Apex Natural Gas, LLC	35,000 ft
Ha Ra Sum;prst 13&24-11-11hc 007-Alt	17-031-27137	Other status	Other type	De Soto, LA	Expand Operating LLC	35,000 ft
Ha Ra Suaa;crdl 9&28-16-14hc 005-Alt	17-017-37057	Other status	Other type	Caddo, LA	Apex Natural Gas, LLC	35,000 ft
Ha Ra Sum;prst 13&24-11-11hc 006-Alt	17-031-27136	Other status	Other type	De Soto, LA	Expand Operating LLC	35,000 ft
Ha Ra Suaa;crdl 9&28-16-14hc 003-Alt	17-017-37055	Other status	Other type	Caddo, LA	Apex Natural Gas, LLC	35,000 ft
Ha Ra Suaa;crdl 9&28-16-14hc 001	17-017-37053	Other status	Other type	Caddo, LA	Apex Natural Gas, LLC	35,000 ft
Ha Ra Suvv;rush 11&14&52-11-9h 001-Alt	17-081-21949	Other status	Other type	Red River, LA	Expand Operating LLC	35,000 ft
Ha Ra Suff;alva 34&27&22&15 Hc 001-Alt	17-031-27621	Other status	Other type	De Soto, LA	Expand Operating LLC	35,000 ft
Ha Ra Sua;tim 27&22&15-15-16hc 001-Alt	17-017-37035	Other status	Other type	Caddo, LA	Expand Operating LLC	35,000 ft
Ha Ra Suqq;san 3&10-10-12 Hc 002-Alt	17-031-27619	Other status	Other type	De Soto, LA	Expand Operating LLC	35,000 ft
Ha Ra Su81;chc34&3&10-17-15hc 001-Alt	17-017-37048	Other status	Other type	Caddo, LA	Expand Operating LLC	35,000 ft
B 13&12&11&1&2&35 Lhc 001	17-017-37025	Other status	Other type	Caddo, LA	Expand Operating LLC	35,000 ft
Ha Ra Suaa;crdl 9&28-16-14hc 002-Alt	17-017-37054	Other status	Other type	Caddo, LA	Apex Natural Gas, LLC	35,000 ft
Ha Ra Su89;chc27&22&15-17-15hc 001-Alt	17-017-37047	Other status	Other type	Caddo, LA	Expand Operating LLC	35,000 ft
Farms 19&18-10-10hc 001	17-069-20560	Other status	Other type	Natchitoches, LA	Apex Natural Gas, LLC	35,000 ft
Ha Ra Suf;wilkn3&10&39&15&40hc 001-Alt	17-081-21945	Other status	Other type	Red River, LA	Expand Operating LLC	35,000 ft
Ha Ra Sua;tim 27&22&15-15-16hc 002-Alt	17-017-37036	Other status	Other type	Caddo, LA	Expand Operating LLC	35,000 ft
Ha Ra Suqq;san 3&10-10-12 Hc 001-Alt	17-031-27618	Other status	Other type	De Soto, LA	Expand Operating LLC	35,000 ft
Ha Ra Suf;wilkn 3&10&38&39 Hc 001-Alt	17-081-21944	Other status	Other type	Red River, LA	Expand Operating LLC	35,000 ft
Ha Ra Suff;alva 34&3-11-11 Hc 003-Alt	17-031-27622	Other status	Other type	De Soto, LA	Expand Operating LLC	35,000 ft
Ha Ra Suvv;rush 11&14-11-9 H 001-Alt	17-081-21948	Other status	Other type	Red River, LA	Expand Operating LLC	35,000 ft
Ha Ra Suqq;san 3&10-10-12 Hc 003-Alt	17-031-27620	Other status	Other type	De Soto, LA	Expand Operating LLC	35,000 ft
Farms 19&6-10-10hc 001	17-069-20559	Other status	Other type	Natchitoches, LA	Apex Natural Gas, LLC	35,000 ft
Ha Ra Suh;mes 27&22&15-11-11hc 002-Alt	17-031-27615	Other status	Other type	De Soto, LA	Expand Operating LLC	35,000 ft
Ha Ra Suh;mes 27&22&15-11-11hc 001-Alt	17-031-27614	Other status	Other type	De Soto, LA	Expand Operating LLC	35,000 ft
Ha Ra Suff;alva 34&3-11-11 Hc 004-Alt	17-031-27623	Other status	Other type	De Soto, LA	Expand Operating LLC	35,000 ft
Ha Ra Sua;tim 27&22&15-15-16hc 003-Alt	17-017-37037	Other status	Other type	Caddo, LA	Expand Operating LLC	35,000 ft
Rothenbuhler B UP MNR 4H	34-111-24967	Active	Oil	Monroe, OH	Expand Operating LLC	34,403 ft
Emerson Belle C UP MNR 5H	34-111-24990	Active	Oil	Monroe, OH	Expand Operating LLC	34,098 ft
McFrederick B UP BLT 2H	34-013-21616	Other status	Oil	Belmont, OH	Expand Operating LLC	33,785 ft
Cross Creek A S CRC JF 4H	34-081-21016	Active	Oil	Jefferson, OH	Ascent Resources Utica LLC	33,598 ft
Emerson Belle B UP MNR 3H	34-111-24989	Active	Oil	Monroe, OH	Expand Operating LLC	33,145 ft
Dickson SE CRC JF 6H	34-081-21008	Active	Oil	Jefferson, OH	Ascent Resources Utica LLC	33,014 ft
Emerson Belle A UP MNR 1H	34-111-24988	Active	Oil	Monroe, OH	Expand Operating LLC	32,994 ft
Cross Creek A SE CRC JF 6H	34-081-21017	Other status	Oil	Jefferson, OH	Ascent Resources Utica LLC	32,736 ft
Dickson S CRC JF 4H	34-081-21007	Active	Oil	Jefferson, OH	Ascent Resources Utica LLC	32,736 ft
Dickson E CRC JF 8H	34-081-21009	Active	Oil	Jefferson, OH	Ascent Resources Utica LLC	32,582 ft
Dickson SW CRC JF 2H	34-081-21006	Active	Oil	Jefferson, OH	Ascent Resources Utica LLC	32,570 ft
Ha Ra Suz;14 Oaks 9&21-17-14hc 001	17-017-37026	Other status	Other type	Caddo, LA	Apex Natural Gas, LLC	32,500 ft
Ha Ra Suz;14 Oaks 9&21-17-14hc 003-Alt	17-017-37028	Other status	Other type	Caddo, LA	Apex Natural Gas, LLC	32,500 ft
Ha Ra Suz;14 Oaks 9&21-17-14hc 002-Alt	17-017-37027	Other status	Other type	Caddo, LA	Apex Natural Gas, LLC	32,500 ft
Ha Ra Su140;egp 24-13-12-1hc 002-Alt	17-015-25421	Other status	Other type	Bossier, LA	Bpx Operating Company	32,482 ft
Lcv Ra Su78;sorens25-36-1-12hc 001-Alt	17-017-36949	Active	Gas	Caddo, LA	Bpx Operating Company	32,001 ft
Ha Ra Su140;egp 24-13-12-1hc 001-Alt	17-015-25420	Other status	Other type	Bossier, LA	Bpx Operating Company	31,975 ft
State Line Federal 2759 14-26 2B	25-085-22085	Active	Oil	Roosevelt, MT	Oasis Petroleum North America LLC	31,810 ft
Partridge 41-13H	33-025-05043	Active	Oil	Dunn, ND	Marathon Oil Company	31,781 ft
Sunell 11-17h	33-025-05003	Active	Oil	Dunn, ND	Marathon Oil Company	31,669 ft
Clawson 11-18H	33-025-05044	Active	Oil	Dunn, ND	Marathon Oil Company	31,664 ft
Semerad 11-18H	33-025-05045	Active	Oil	Dunn, ND	Marathon Oil Company	31,614 ft
Nystuen 20-17-8-5 1H	33-105-06543	Active	Oil	Williams, ND	Phoenix Operating LLC	31,594 ft
Schindler S U1H	34-111-24985	Active	Oil	Monroe, OH	Rice Drilling D LLC	31,559 ft
Hollyfield CR MON 210H	34-019-22919	Active	Oil	Carroll, OH	EOG Ohio, LLC	31,547 ft
Bjorge 41-18h	33-025-05004	Active	Oil	Dunn, ND	Marathon Oil Company	31,532 ft
Liggett NE ATH HR 5H	34-067-21770	Active	Oil	Harrison, OH	Ascent Resources Utica LLC	31,531 ft
Randall E-M MNR 4HM	34-111-25021	Other status	Oil	Monroe, OH	Expand Operating LLC	31,514 ft
Hollyfield CR MON 6H	34-019-22916	Active	Oil	Carroll, OH	EOG Ohio, LLC	31,500 ft
Owan 5402 43-26 3BU	33-105-06375	Active	Oil	Williams, ND	Oasis Petroleum North America LLC	31,328 ft
EN-Hilleren- 157-94-1336H-1	33-061-05330	Active	Oil	Mountrail, ND	Hess Bakken Investments Ii, LLC	31,140 ft
Willow Gray 2-11-14-23 6H-LL	33-023-01641	Active	Oil	Divide, ND	Phoenix Operating LLC	31,140 ft
Violet Olson 5596 13-5 2B	33-105-06401	Active	Oil	Williams, ND	Whiting Oil And Gas Corporation	31,080 ft
Nystuen 20-17-8-5 2H	33-105-06544	Active	Oil	Williams, ND	Phoenix Operating LLC	31,076 ft
Hollyfield CR MON 8H	34-019-22917	Active	Oil	Carroll, OH	EOG Ohio, LLC	31,072 ft
Hollyfield CR MON 10H	34-019-22918	Active	Oil	Carroll, OH	EOG Ohio, LLC	31,064 ft
Wefler S U1h	34-111-24889	Active	Oil	Monroe, OH	Rice Drilling D LLC	31,036 ft
EN-Hilleren- 157-94-1336H-2	33-061-05500	Active	Oil	Mountrail, ND	Hess Bakken Investments Ii, LLC	30,979 ft
Liggett N ATH HR 3H	34-067-21769	Active	Oil	Harrison, OH	Ascent Resources Utica LLC	30,947 ft
Cv 8630 Ra Sua;lewis 002-D	17-061-20393	Plugged & abandoned	Gas	Lincoln, LA	Riviera Operating, LLC	30,937 ft
Nystuen 20-17-8-5 5H	33-105-06546	Active	Oil	Williams, ND	Phoenix Operating LLC	30,926 ft
Wagner GY CEN 10H	34-059-24677	Active	Oil	Guernsey, OH	EOG Ohio, LLC	30,908 ft
Violet Olson 5596 13-5 4B	33-105-06403	Active	Oil	Williams, ND	Whiting Oil And Gas Corporation	30,900 ft
Liggett NW ATH HR 1H	34-067-21768	Active	Oil	Harrison, OH	Ascent Resources Utica LLC	30,877 ft
Nystuen 20-17-8-5 3H	33-105-06505	Active	Oil	Williams, ND	Phoenix Operating LLC	30,875 ft
Oa A0406 001	17-099-21637	Shut-in	Other type	St Martin, LA	Highlander Oil & Gas Assets LLC	30,862 ft
Nystuen 20-17-8-5 4H	33-105-06545	Active	Oil	Williams, ND	Phoenix Operating LLC	30,850 ft
Willow Gray 2-11-14-23 5H	33-023-01640	Active	Oil	Divide, ND	Phoenix Operating LLC	30,844 ft
Wagner GY CEN 210H	34-059-24678	Active	Oil	Guernsey, OH	EOG Ohio, LLC	30,825 ft
BL-JE Ulven- 155-96-0322H-1	33-105-06242	Active	Oil	Williams, ND	Hess Bakken Investments Ii, LLC	30,800 ft
Pearl Ne Wel Jf 9h	34-081-21002	Active	Oil	Jefferson, OH	Ascent Resources Utica LLC	30,744 ft
Barber Ridge 210606 4A	34-111-24981	Active	Oil	Monroe, OH	Gulfport Appalachia LLC	30,735 ft
Collectors Triangle S U4h	34-111-24845	Active	Oil	Monroe, OH	Rice Drilling D LLC	30,715 ft
BL-JE Ulven- 155-96-0322H-2	33-105-06243	Active	Oil	Williams, ND	Hess Bakken Investments Ii, LLC	30,705 ft
Bella SE CDZ HR 4H	34-067-21740	Active	Oil	Harrison, OH	Ascent Resources Utica LLC	30,689 ft
Roth D 8h	34-111-24812	Active	Oil	Monroe, OH	Expand Operating LLC	30,676 ft
Pelletier JN SAL 1H	34-081-20993	Active	Oil	Jefferson, OH	EOG Ohio, LLC	30,655 ft
Schindler S U2H	34-111-24984	Active	Oil	Monroe, OH	Rice Drilling D LLC	30,635 ft
Rystedt 5892 31-28 2B	33-061-05389	Shut-in	Oil	Mountrail, ND	Oasis Petroleum North America LLC	30,565 ft
Pfalzgraf U5H	34-111-24991	Other status	Oil	Monroe, OH	Rice Drilling D LLC	30,546 ft
Pelletier JN SAL 3H	34-081-20994	Active	Oil	Jefferson, OH	EOG Ohio, LLC	30,539 ft
Arnaudet 007	17-001-21271	Plugged & abandoned	Oil	Acadia, LA	Two Bayous, Inc.	30,494 ft
Roth B 4h	34-111-24811	Active	Oil	Monroe, OH	Expand Operating LLC	30,493 ft
Randall L-M MNR 15HM	34-111-25024	Other status	Oil	Monroe, OH	Expand Operating LLC	30,478 ft
Beros SE 15HU	34-059-24720	Active	Oil	Guernsey, OH	Inr Ohio LLC	30,391 ft
Larke CR BRN 6H	34-019-22872	Active	Oil	Carroll, OH	EOG Ohio, LLC	30,335 ft
Felix 9-16-21-28 5H	25-085-22049	Active	Oil	Roosevelt, MT	Kraken Operating, LLC	30,302 ft
Felix 9-16-21-28 4H	25-085-22048	Active	Oil	Roosevelt, MT	Kraken Operating, LLC	30,293 ft
Feiring State 5793 13-16 3BU	33-061-05524	Active	Oil	Mountrail, ND	Oasis Petroleum North America LLC	30,250 ft
Miller D-M MNR 4HM	34-111-24972	Other status	Oil	Monroe, OH	Expand Operating LLC	30,133 ft
Wiley D 8h	34-111-24797	Active	Oil	Monroe, OH	Expand Operating LLC	30,130 ft
Angelo 210720 2a	34-081-20890	Active	Oil	Jefferson, OH	Gulfport Appalachia LLC	30,126 ft

Maximum published depth by state

State	Max depth	Catalogued wells
Louisiana	35,000 ft	225,721
Ohio	34,403 ft	242,049
Montana	31,810 ft	42,009
North Dakota	31,781 ft	43,680
Illinois	29,864 ft	174,493
Colorado	29,046 ft	124,327
New Mexico	28,133 ft	141,088
Michigan	27,242 ft	85,673
Wyoming	25,830 ft	129,955
Mississippi	25,500 ft	34,924
Alabama	21,928 ft	15,091
Arkansas	17,825 ft	33,791
Kentucky	16,108 ft	193,973
New York	15,921 ft	46,514
Kansas	11,300 ft	474,051