JPMorgan Chase Bank, N.A. , doing business as Chase, is a national bank that constitutes the consumer and commercial banking subsidiary of financial services firm JPMorgan Chase. The bank was known as Chase Manhattan Bank until it merged with J.P. Morgan & Co. in 2000. Chase Manhattan Bank was formed by the merger of the Chase National Bank and the Bank of the Manhattan Company in 1955. The bank is headquartered in Chicago, since its merger with Bank One Corporation in 2004.