| Business | Phone |
| Bank Of America 3080 Middle Country Rd, Lake Grove 11755 | (631) 000-1111 |
| Bank Of New York 2001 Nesconset Hwy, Lake Grove 11755 | (631) 979-9595 |
| Bank Of Smithtown 2921 Middle Country Rd, Lake Grove 11755 | (631) 588-0700 |
| Chase 313 Smith Haven Mall, Lake Grove 11755 | (516) 935-9935 |
| Citibank 131 Alexander Ave, Lake Grove 11755 | (631) 265-0164 |
| North Fork Bank 143 Alexander Ave, Lake Grove 11755 | (631) 724-3400 |
| Washington Mutual 2003 Smith Haven Plz, Lake Grove 11755 | (631) 979-7624 |