Three branches of ISRO are located in Gujarat – Space Applications Centre (SAC), Physical Research Laboratory (PRL), Development and Educational Communication Unit (DECU). All of them are located in Ahmedabad. You can read about the Indian Space Research Organisation [ISRO Notes for UPSC] at the given link.

Further readings:

1. GSLV Mk III – A Comprehensive Overview of Medium Lift Launch Vehicle
2. Mars Orbiter Mission (MOM) – A Complete Overview of Mangalyaan Mission