| Business | Phone |
| Wachovia Bank 310 Heights Rd, Darien 6820 | (203) 655-3455 |
| Wachovia Bank 950 Post Rd, Darien 6820 | (203) 655-7220 |
| Webster Bank 1101 Boston Post Rd, Darien 6820 | (203) 656-4070 |
| Bank Of America 1120 Post Rd, Darien 6820 | (203) 000-1111 |
| Bank Of America 7 Sedgewick Ave, Darien 6820 | (203) 000-1111 |
| Bank Of America Old Kings Hwy N, Darien 6820 | (203) 000-1111 |
| Chase 454 Boston Post Rd, Darien 6820 | (203) 000-1111 |
| Darien Bank & Trust 777 Post Rd, Darien 6820 | (203) 656-0699 |
| Darien Bank & Trust Co 316 Mansfield Ave, Darien 6820 | (203) 656-0898 |
| Darien Rowayton Bank 993 Post Rd, Darien 6820 | (203) 656-3500 |
| Peoples Bank 25 Old Kings Hwy N, Darien 6820 | (203) 655-7617 |
| Peoples Bank 72 Edgerton St, Darien 6820 | (203) 655-9748 |
| Fairfield County Bank 1899 Post Rd, Darien 6820 | (203) 656-2265 |
| First County Bank 19 Corbin Dr, Darien 6820 | (203) 462-4200 |
| Hudson United Bank 20 West Ave, Darien 6820 | (203) 662-5200 |