The Spaceport of India sits in Nellore district, with two launch pads and a third for sounding rockets

Background

ISRO's own centre page gives the address of the Satish Dhawan Space Centre (SDSC) SHAR as Sriharikota Range PO - 524 124, Nellore District, Andhra Pradesh, with Shri S. Muthuchezhian as Director.
The page calls SDSC SHAR, Sriharikota, the Spaceport of India, responsible for providing launch base infrastructure for the Indian Space Programme.
Its facilities cover solid propellant processing, static testing of solid motors, launch vehicle integration and launch operations, and range operations comprising a telemetry, tracking and command network and a mission control centre.
The centre has two launch pads from where the rocket launching operations of PSLV and GSLV are carried out, and a separate launch pad for launching sounding rockets.
Its threefold mandate is to produce solid propellant boosters for ISRO's launch vehicle programmes, to provide infrastructure for qualifying subsystems and solid rocket motors and carrying out the necessary tests, and to provide launch base infrastructure for satellites and launch vehicles.