| Banking & Credit | Address | |
| 1 | ♠ Columbia Bank | 655 Fremont St, Colusa, CA 95932 |
| 2 | ♠ First Northern Bank | 558 Market St, Colusa, CA 95932 |
| 3 | ♠ Wells Fargo Bank | 501 Market St, Colusa, CA 95932 |
| 4 | ♠ Tri Counties Bank | 600 Market St, Colusa, CA 95932 |
| 5 | ♠ Colusa-Glenn Farm Credit | 2970 Davison Ct, Colusa, CA 95932 |
| 6 | ♠ Accounting By Nicol | 1004 Market St, Colusa, CA 95932 |