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

There is no office of the ONGC in the Arunachal Pradesh to the best of my knowledge

To check the address of the ONGC you can follow the below process

Visit the official site of the ONGC

A page like below will open



Hit on the option for the contact us at the top side

Select the link for the ONGC offices there

Here you can find the address of all the offices of the ONGC