| Business | Phone |
| Apple Bank For Savings 91 Route 111, Smithtown 11787 | (631) 724-8700 |
| Long Island Commercial Bank 50 Route 111, Smithtown 11787 | (631) 979-0888 |
| Bank Of America 31 Route 111, Smithtown 11787 | (631) 000-1111 |
| Bank Of New York 222 Middle Country Rd, Smithtown 11787 | (631) 979-8600 |
| Bank Of Smithtown 17 Bank Ave, Smithtown 11787 | (631) 724-4823 |
| Chase 42 W Main St, Smithtown 11787 | (516) 935-9935 |
| Citibank 18 E Main St, Smithtown 11787 | (631) 366-2800 |
| North Fork Bank 1 W Main St # 1, Smithtown 11787 | (631) 265-2260 |
| North Fork Bank 82 E Main St, Smithtown 11787 | (631) 724-4500 |
| Roslyn Savings Bank 719 Smithtown Byp, Smithtown 11787 | (631) 265-2600 |
| Suffolk County National Bank 260 Middle Country Rd, Smithtown 11787 | (631) 979-3400 |
| Washington Mutual 138 E Main St, Smithtown 11787 | (631) 979-6015 |