| Business | Phone |
| Working America 2060 N High St # J, Columbus 43201 | (614) 220-9005 |
| Afl-Cio 395 E Broad St # 300, Columbus 43215 | (614) 224-8271 |
| Afscme 1545 Alum Creek Dr, Columbus 43209 | (614) 252-2898 |
| Afscme 1771 Joyce Ave, Columbus 43219 | (614) 291-1632 |
| Afscme 6805 Oakcreek Dr, Columbus 43229 | (614) 523-7550 |
| American Federation Government 3990 E Broad St, Columbus 43213 | (614) 236-0957 |
| American Postal Workers Union 1820 Northwest Blvd, Columbus 43212 | (614) 486-4837 |
| Asbestos Workers 947 Goodale Blvd # 244, Columbus 43212 | (614) 221-7177 |
| Transport Workers Union 2800 S High St, Columbus 43207 | (614) 491-0357 |
| Transport Workers Union 3099 Sullivant Ave, Columbus 43204 | (614) 276-1607 |
| United Auto Workers Local 3761 Harding Dr, Columbus 43228 | (614) 272-7597 |
| United Industrial Workers 2800 S High St, Columbus 43207 | (614) 497-2446 |
| United Steelworkers Of America 1135 Cleveland Ave, Columbus 43201 | (614) 299-4197 |
| United Steelworkers Of America 2182 Groveport Rd, Columbus 43207 | (614) 444-8391 |
| Baker's Local Union 555 E Rich St # 206, Columbus 43215 | (614) 221-5541 |
| Teamsters Local Union 555 E Rich St # 103, Columbus 43215 | (614) 228-0727 |
| Brewery & Soft Drink Workers 1663 Arlington Ave, Columbus 43212 | (614) 488-5120 |
| Bricklayers Local 1347 W 5th Ave # 204, Columbus 43212 | (614) 481-8155 |
| South Central Oh Regional 1394 Courtright Rd, Columbus 43227 | (614) 236-2440 |
| South Central Ohio District 1394 Courtright Rd, Columbus 43227 | (614) 236-4205 |
| Southside Labor Temple Local 1171 Gilbert St, Columbus 43206 | (614) 443-9003 |
| Sheet Metal Workers 3037 Lamb Ave, Columbus 43219 | (614) 471-1793 |
| Sheet Metal Workers Local 98 3033 Lamb Ave, Columbus 43219 | (614) 471-7892 |
| Carpenters & Joiners Union 1545 Alum Creek Dr, Columbus 43209 | (614) 253-7288 |
| Carpenters Industrial Local 1545 Alum Creek Dr, Columbus 43209 | (614) 252-0530 |
| Cement Masons Union 1347 W 5th Ave, Columbus 43212 | (614) 488-8011 |
| Central Oea Nea Inc 1395 Dublin Rd, Columbus 43215 | (614) 487-9960 |
| Seiu District 1199 Hlthcr 1395 Dublin Rd, Columbus 43215 | (614) 461-1199 |
| Central Ohio Federation-Mscns 1585 Bethel Rd, Columbus 43220 | (614) 457-6371 |
| Roofers Local Union 37 W 2nd Ave, Columbus 43201 | (614) 299-6404 |
| Rwdsu Afl-Cio Intl Union 1571 Parsons Ave, Columbus 43207 | (614) 444-7208 |
| Columbus Building Trades 555 E Rich St # 217, Columbus 43215 | (614) 221-7171 |
| Columbus Education Assn 929 E Broad St, Columbus 43205 | (614) 253-4731 |
| Columbus Firefighters Union 1380 Dublin Rd # 103, Columbus 43215 | (614) 481-8900 |
| Columbus-Franklin County Aflci 1545 Alum Creek Dr, Columbus 43209 | (614) 257-1920 |
| Communications Workers-America 27 Euclid Ave, Columbus 43201 | (614) 294-5265 |
| Communications Workers-America 2991 Sullivant Ave, Columbus 43204 | (614) 279-4310 |
| Communications Workers-America 4140 E Broad St, Columbus 43213 | (614) 236-8065 |
| Professionals Guild Of Ohio 1471 E Broad St, Columbus 43205 | (614) 258-4401 |
| Plumbers & Pipe Fitters Union 1226 Kinnear Rd, Columbus 43212 | (614) 486-8980 |
| Plumbers & Pipe Fitters Union 1230 Kinnear Rd, Columbus 43212 | (614) 486-5203 |
| Plumbers & Pipe Fitters Union 1250 Kinnear Rd, Columbus 43212 | (614) 486-2912 |
| Pace International Union 255 Phillipi Rd, Columbus 43228 | (614) 274-3996 |
| Painters Local Union 1104 Cleveland Ave, Columbus 43201 | (614) 294-5301 |
| Ohio & Vicinity Regional 222 E Town St, Columbus 43215 | (614) 461-4700 |
| Ohio Association-Public School 6805 Oakcreek Dr, Columbus 43229 | (614) 890-4770 |
| Ohio Education Assn 225 E Broad St, Columbus 43215 | (614) 228-4526 |
| Ohio Federation Of Teachers 1251 E Broad St, Columbus 43205 | (614) 258-3240 |
| Ohio Laborer's Lecet 88 N 5th St, Columbus 43215 | (614) 469-4736 |
| Ohio State Bldg & Constr Trade 222 E Town St, Columbus 43215 | (614) 461-6541 |
| Ohio State Building & Constr 236 E Town St # 120, Columbus 43215 | (614) 221-3682 |
| Ohio State Legislative Board 2021 E Dublin Granville # 245, Columbus 43229 | (614) 847-0011 |
| Ohio State Local Union 1557 Parsons Ave, Columbus 43207 | (614) 443-9414 |
| Ohio Valley Council Of Sheet 222 E Town St, Columbus 43215 | (614) 469-4808 |
| National Assn-Letter Carriers 1029 Harrisburg Pike, Columbus 43223 | (614) 279-2778 |
| Millwrights Local Union 3186 E Livingston Ave, Columbus 43227 | (614) 239-0318 |
| Local Retail Wholesale & Dept 1571 Parsons Ave, Columbus 43207 | (614) 443-8811 |
| Iatse Stagehands Local 12 566 E Rich St, Columbus 43215 | (614) 221-3753 |
| Ibew 23 W 2nd Ave, Columbus 43201 | (614) 294-4786 |
| Ibew 3345 S Hamilton Rd, Columbus 43232 | (614) 837-1008 |
| Laborers International Union 620 Alum Creek Dr # 1, Columbus 43205 | (614) 252-1093 |
| Imi 305 Piedmont Rd, Columbus 43214 | (614) 263-3680 |
| International Association-Mach 2625 Winchester Pike, Columbus 43232 | (614) 239-0200 |
| International Union Of Elect 1515 Delashmut Ave, Columbus 43212 | (614) 299-1515 |
| International Union-Oper Engrs 1188 Dublin Rd, Columbus 43215 | (614) 486-5281 |
| Iron Workers Local Union 2867 S High St, Columbus 43207 | (614) 497-0550 |