As of 2023, the bank with the largest customer base in India is the State Bank of India (SBI).

With over 450 million account holders, SBI has firmly cemented its position as the leading bank in the country's highly competitive banking sector.

Several factors have contributed to SBI's dominant market share.

Firstly, its extensive branch network, with over 22,000 branches and 62,000 ATMs spread across India, provides unparalleled accessibility to customers, even in remote areas.

This expansive reach, coupled with a diverse range of banking services, has made SBI the go-to choice for millions of Indians, from rural farmers to urban professionals. - https://indiafocusguide.com/blog/which-bank-most-customers-india/?unique_id_rwzvsq61

Dominance in India's Banking Landscape: Uncovering the Factors Behind the Market Leader