The city of Ambarnath, in the Indian state of Maharashtra, is also a part of the Mumbai Metropolitan Region. It falls within the territorial boundaries of the Thane district. The city is often spelled as Ambernath. The name Ambarnath translates to the Lord of the Sky and refers to Lord Shiva. The city is the site of an old temple dedicated to Lord Shiva, from 1060 AD. Like all suburbs of Mumbai, the railway track divides the city of Ambarnath into Ambarnath East and Ambarnath West. Ambarnath west has developed as an industrial zone and it has numerous small and large chemical factories. The government of India has set up an Ordnance Factory in the region, which is slowly developing a residential neighborhood in the area. There is a large safety matchstick manufacturing facility of WIMCO is located in this region along with more than 150 large-scale industries such as textile, aerospace, chemicals, edible goods and electrical hardware. Ambarnath East is mostly a residential area. The famous Shiva temple is located in Ambarnath East along with several residential and sporting complexes.
In 1964 the head office of Indian Overseas Bank was inaugurated at Mount Road. The Indian Overseas Bank has been the first public sector bank to introduce mobile banking services using Wireless Application Protocol(WAP). On 29 August 2003, the Indian Overseas Bank has opened an extension counter at Bambalapitiya, Ceylon. In 2005, the IOB began a representative office in Guangzhou; China followed which the bank opened another representative office in Kuala Lumpur and Dubai, UAE. In 2007 The bank took over Bharat Overseas Bank. After three years, Malaysia granted a commercial banking license to a local bank jointly owned by Bank Of Baroda, Indian Overseas Bank, and the Andhra Bank. The new bank named, India International Bank (IIB Malaysia), began its operations in 2012 in Kuala Lumpur and had a large population of Indians. The Andhra Bank has a 25% stake in its joint-venture, BOB owns 40%, and remaining 35% is with IOB. On 31 August 2013, the Indian Overseas Bank has incorporated an offshore banking unit in Colombo, Sri Lanka. The bank also converted its existing Extension Counter at Ceylon into a full-fledged branch. In 2014-15, the IOB bank has crossed the target of 3000 ATMs as on 2014.IOB also launched m passbook app as a new mobile banking initiative.