| Business | Phone |
| Willadsen Lund Engineering 902 S Cleveland Ave, Sioux Falls 57103 | (605) 338-6950 |
| Bartlett & West Engineering 300 N Dakota Ave, Sioux Falls 57104 | (605) 274-7415 |
| Stockwell Engineers 211 E 14th St # 200, Sioux Falls 57104 | (605) 338-6668 |
| Clark Engineering 1410 W Russell St, Sioux Falls 57104 | (605) 331-2505 |
| Schmitz-Kalda Assoc Inc 320 N Main Ave # A, Sioux Falls 57104 | (605) 332-8241 |
| Ehrhart Griffin & Assoc 300 N Dakota Ave, Sioux Falls 57104 | (605) 339-7215 |
| R F Sayre & Assoc 216 S Duluth Ave, Sioux Falls 57104 | (605) 332-7211 |