| Business | Phone |
| Afl-Cio Labor Management 501 Ne 27th St, Oklahoma City 73105 | (405) 528-2409 |
| Aft 2915 N Classen Blvd, Oklahoma City 73106 | (405) 528-2381 |
| Amalgamated Transit Union 993 320 Sw 25th St, Oklahoma City 73109 | (405) 631-5669 |
| American Federation Government 4444 S Douglas Blvd, Oklahoma City 73150 | (405) 733-3852 |
| American Federation-Employees 3000 Tower Dr # 708, Oklahoma City 73115 | (405) 670-2656 |
| American Federation-Employees 3400 S Western Ave, Oklahoma City 73109 | (405) 631-5531 |
| American Federation-Teachers 2915 N Classen Blvd # 222, Oklahoma City 73106 | (405) 528-0801 |
| American Postal Workers Union 320 Sw 5th St, Oklahoma City 73125 | (405) 232-7656 |
| American Postal Workers Union 5700 S Portland Ave, Oklahoma City 73119 | (405) 685-5700 |
| Arkansas Regional Council 914 1/2 W California Ave, Oklahoma City 73106 | (405) 235-4732 |
| Asbestos Workers Local Union 5350 S Western Ave, Oklahoma City 73109 | (405) 632-6767 |
| Brick Layers Local Union 5 212 Ne 27th St, Oklahoma City 73105 | (405) 528-5609 |
| Communications Workers-America 5408 N Santa Fe Ave, Oklahoma City 73118 | (405) 528-6016 |
| Electricians Joint Apprntcshp 208 N Klein Ave, Oklahoma City 73106 | (405) 232-3836 |
| Electricians Local Union 1141 1141 Nw 1st St, Oklahoma City 73106 | (405) 236-5449 |
| Electricians Local Union 1141 1700 Se 15th St, Oklahoma City 73129 | (405) 670-4777 |
| Iatse Local 112 400 W Sheridan Ave, Oklahoma City 73102 | (405) 232-4793 |
| International Association-Mach 2401 S Harvey Ave, Oklahoma City 73109 | (405) 634-4466 |
| International Union-Elevator 3815 N Santa Fe Ave, Oklahoma City 73118 | (405) 521-9385 |
| International Union-Oper Engrs 9412 N Robinson Ave, Oklahoma City 73114 | (405) 848-7400 |
| Iron Workers Union 617 Sw 29th St, Oklahoma City 73109 | (405) 632-6154 |
| National Assn-Letter Carriers 221 S Eagle Ln, Oklahoma City 73128 | (405) 789-2220 |
| National Post Office Mail 2601 Purdue Dr, Oklahoma City 73128 | (405) 680-9430 |
| Uaw Local 286 9134 S Walker Ave, Oklahoma City 73139 | (405) 635-1542 |
| Oklahoma City Firefighters 157 Nw 6th St, Oklahoma City 73102 | (405) 232-9543 |
| Painters & Allied Trades Local 1919 S Santa Fe Ave, Oklahoma City 73109 | (405) 235-4145 |
| Plumbers & Pipe Fitters 4335 Sw 44th St, Oklahoma City 73119 | (405) 682-4571 |
| Plumbers & Pipefitters Health 4337 Sw 44th St, Oklahoma City 73119 | (405) 682-4581 |
| Professional Fire Fighters 6103 Melrose Ln, Oklahoma City 73127 | (405) 789-0061 |
| Western Oklahoma Building Cncl 5350 S Western Ave # 217, Oklahoma City 73109 | (405) 616-0141 |
| Transport Workers Union 2401 1/2 Sw 45th St, Oklahoma City 73119 | (405) 685-4337 |
| Uaw 2310 Sw 89th St, Oklahoma City 73159 | (405) 691-4900 |
| Uaw 7125 S Air Depot Blvd, Oklahoma City 73135 | (405) 732-7330 |
| Uaw 7447 Se 74th St, Oklahoma City 73135 | (405) 733-1599 |
| Union-North America Laborers' 38 Ne 28th St, Oklahoma City 73105 | (405) 525-8877 |
| United Steelworkers Of America 6815 Nw 10th St # 2, Oklahoma City 73127 | (405) 495-8303 |
| Teamsters Local Union 3528 W Reno Ave, Oklahoma City 73107 | (405) 947-2333 |
| Sheet Metal Workers Local 124 1404 Nw 1st St, Oklahoma City 73106 | (405) 232-1453 |
| Roofers Local 143 111 Ne 26th St, Oklahoma City 73105 | (405) 524-4243 |