Pincode 603003 have been assigned to 5 locations.

Ammanambakkam , Vallam , Chengalpattu
Meleripakkam , Vallam , Chengalpattu
Nenmeli , Vallam , Chengalpattu
Tiruvadisoolam , Vallam , Chengalpattu
Vallam , Chengalpattu , Chengalpattu