Oil and Natural Gas Corporation Limited (ONGC) is an Indian multinational oil and gas company headquartered in Dehradun, Uttarakhand, India.

It is a Public Sector Undertaking (PSU) of the Government of India.

There is no office of ONGC located in USA below I am providing you the details of ONGC Subsidiaries:

List of ONGC Subsidiaries:

ONGC Videsh:

Presence of ONGC Videsh Limited (OVL) in Latin America;

Brazil (Block BC-10, BM-SEAL-4, BM-BAR-1, BM-ES-42, BM-S-73 & S-74)
Colombia (Block LLA-69, RC-8, RC-9, RC-10, SSJN-7 & CPO-5)
Cuba (Block N-25, N-26, N-27, N-28, N-29 N-34, N-35 & N-36 Block)
Venezuela (Block San Cristobal, Block Carabobo-1)

Presence of ONGC Videsh Limited (OVL) in CIS & Far-East;

Vietnam (Block 06.1, 127, 128)
Myanmar (Block A-1, A-3, AD-2, AD-3 & AD-9, Pipeline Project- PipeCo-1, PipeCo-2)
Russia (Block Sakhalin-I, 69, 70–1, 70–2, 70–3, 77, 80, 85–1, 85–2 and 86)(15% shares in csjc vancourneft company of vancour)
Kazakhstan (Satpayev Exploration Block)

Presence of ONGC Videsh Limited (OVL) in Africa;

Libya (Block NC-189, 81–1, Contract Area 43)
Nigeria (Block OPL 279, OPL 285, Block-2)
Sudan & South Sudan (GNOP/GNPOC/GPOC- 1, 2 & 4, Block 5A, Pipeline- Khartoum-Port Project)
Mozambique (Rovuma Area 1 Offshore)

Presence of ONGC Videsh Limited (OVL) in Middle East;

Iraq (Exploration Block-8)
Syria (Al Furat (4 PSA), Block-XXIV)
"Mangalore Refinery and Petrochemicals Limited":

Contact:

Office Address :
Tel Bhavan
Dehradun : 248003
Uttaranchal ,India .
Oil and Natural Gas Corporation (ONGC) Phone Number : (135) 2752161 2752162