| Business | Phone |
| Watertown Educational Employee 920 2nd Ave Se, Watertown 57201 | (605) 882-6933 |
| Watertown Employee's Fed Cu 1620 4th St Ne, Watertown 57201 | (605) 882-2357 |
| Sioux Valley Credit Union 316 E Kemp, Watertown 57201 | (605) 882-2706 |
| Sioux Valley Federal Cu 316 E Kemp, Watertown 57201 | (605) 886-8913 |