As you are asking for Bank of America branches which located in Gaithersburg, so on your demand I am telling its address :

Bank of America NA - Shady Grove Branch
Full Service, brick and mortar office
15930 Shady Grove Road
Gaithersburg, MD, 20877

Bank of America NA - Olde Towne Gaithersburg Branch
Full Service, brick and mortar office
22 North Summit Avenue
Gaithersburg, MD, 20877

Bank of America NA - Gaithersburg Square Branch
Full Service, brick and mortar office
474 North Frederick Avenue
Gaithersburg, MD, 20877

Bank of America NA - Quince Orchard Branch
Full Service, brick and mortar office
1048 Quince Orchard Road
Gaithersburg, MD, 20878

Bank of America NA - Montgomery Village Branch
Full Service, brick and mortar office
19294 Montgomery Village Avenue
Gaithersburg, MD, 20886

For more branches info of Bank of America here is process

Go to Bank of America official website

Click on go option which given under location section on the top side

By click there you will land on its branch location finder page which look like given below