| Business | Phone |
| International Electrical Wrkrs 810 N Newton Ave, El Dorado 71730 | (870) 863-9181 |
| Oil Chemical & Atomic Workers 114 1/2 E Elm St, El Dorado 71730 | (870) 862-4191 |
| Plumbers & Pipe Fitters 418 W Main St, El Dorado 71730 | (870) 863-6169 |
| Unisted Steel Workers-America 166 Cooper Dr, El Dorado 71730 | (870) 881-9804 |