PIN reference: Department of Posts, Ministry of Communications, Government of India, All India Pincode Directory (resource published 2020), under GODL-India. Older source snapshot, downloaded 29 October 2026; underlying CSV date unknown and contents existed by May 2024. Adapted to unique PINs and approximate post-office locations; unreliable coordinates omitted. Not a home-location or coverage guarantee, and not government-endorsed. Original dataset.