SEVERAL Dublin banks were among the 44 branches closed by AIB yesterday.
They included Annesley Bridge, Templeogue, Terenure, Irish Farm Centre, Smithfield and Rush.
Branches in nearby Dunboyne, Dunshaughlin and Kilcock also closed.
The move is part of a plan to shut 67 outlets by next year.
AIB said the mass closure and amalgamation of some branches followed a review of services and was a bid to return the bank to viability.
Head of branch banking Denis O'Callaghan said many outlets had seen a decline in customer visits.
"We have seen a very significant change in the way our customers wish to do their banking," said Mr O'Callaghan.
"As a result of this, many of our branches have seen a large decline in customer visits."
"Notwithstanding this, branches will remain an important part of AIB's overall distribution strategy and will be complemented by an enhanced online service."
Arrangements have been made with An Post to ensure people who have lost a branch can carry out banking transactions at their local post office.
Customers will be able to make cash and cheque lodgements, withdraw cash and make credit card payments with the An Post service, he said.
Customer account numbers, cheque books, direct debits, standing orders, ATM and debit cards and any credit facilities will not be affected.
On top of the 44 which shut up shop yesterday, three other outlets closed earlier this month, four are expected to shut down in November and the remaining 16 will close in 2013.
To coincide with the closures, AIB launched a community mobile bank service in 32 locations across Ulster, Munster and Connacht.