Bank of India is a type of public sector bank of India.
It was established in the year 1906.
It’s headquarter is located in Mumbai, Maharashtra, India.

As you have asked about the Bank of India Branches in Thrissur, I found following results

AYYANTHOLE
Code: 8556
IFSC: BKID0008556
Akkarapattiakkal Bldg., Ayyanthole, Thrissur,
State:Kerala ,
City:Thrissur,
PIN:680003
Phone No: (0487) 2365668, 2363414,

TRICHUR
Code: 8550
IFSC: BKID0008550
Ward No. 25, Vadakke Madhom Brahmaswam Bldg., M. G. Road, Trichur,
State:Kerala ,
City:Thrissur,
PIN:688001
Phone No: (0487) 2441268 M, 2440884, 2441197 (F),

You can also find the information from the bank website.
Go to Bank of India website.
Then click on India under Branch option, the page open look like




Here select the state and city and you will get the information.