Oil and Natural Gas Corporation (ONGC) The company profile, contact number, contact address and services offered are given below. Oil and Natural Gas Corporation (ONGC) Head Office , Company statement, financial statement Address of the Oil and Natural Gas Corporation (ONGC) Head Office: Oil building Dehradun: 248003 Uttaranchal, India. Oil and Natural Gas Corporation (ONGC) Phone Number: (135) 2752161 2752162 Website of Oil and Natural Gas Corporation (ONGC) : www.ongcindia.com Oil and Natural Gas Corporation (ONGC) Financial Statement : Number of employees - 5001 and above Turnover in Crs - 5000+ Crs Sector - Public Sector