| Business | Phone |
| 1199 Home Care 611 N Eutaw St, Baltimore 21201 | (410) 685-2229 |
| Afscme 1410 Bush St # B, Baltimore 21230 | (410) 837-3055 |
| Afscme Council 92 190 W Ostend St # 101, Baltimore 21230 | (410) 547-1515 |
| Amalgamated Transit Union 1300 126 W 25th St, Baltimore 21218 | (410) 889-3566 |
| American Postal Workers Union 4 N High St, Baltimore 21202 | (410) 837-4868 |
| Baltimore Building & Constr 5913 Harford Rd, Baltimore 21214 | (410) 426-9415 |
| Baltimore City Fire Officers 1030 S Linwood Ave, Baltimore 21224 | (410) 276-6964 |
| Baltimore Fire Fighters Local 1202 Ridgely St, Baltimore 21230 | (410) 234-0734 |
| Baltimore Mailers Union 888 6000 Erdman Ave, Baltimore 21205 | (410) 485-1069 |
| Baltimore Teachers Union 5800 Metro Dr # 2, Baltimore 21215 | (410) 358-6600 |
| Benefit Office-Local 570 1005 N Point Blvd # 726, Baltimore 21224 | (410) 282-0510 |
| Benefit Systems Management Inc 6650 Belair Rd # 1, Baltimore 21206 | (410) 254-4800 |
| Carpenters District Council 801 W Patapsco Ave, Baltimore 21230 | (410) 355-5555 |
| Cement Masons' Local 43 4324 York Rd # 2, Baltimore 21212 | (410) 243-8255 |
| Operative Plasterers Local 6803 Harford Rd, Baltimore 21234 | (410) 426-1670 |
| District 1199e-Dc Svc Emplys 611 N Eutaw St, Baltimore 21201 | (410) 332-1199 |
| Heavy & Highway Construction 5528 Harford Rd, Baltimore 21214 | (410) 444-1550 |
| Hotel Employees & Restaurant 611 N Eutaw St, Baltimore 21201 | (410) 230-0859 |
| Iatse 114 W Mulberry St, Baltimore 21201 | (410) 685-4141 |
| Iatse-Stage Employees 1111 Park Ave, Baltimore 21201 | (410) 728-6527 |
| Ibew 1101 W Patapsco Ave, Baltimore 21230 | (410) 355-2344 |
| Ila-D Atlantic Coast District 6610 Tributary St, Baltimore 21224 | (410) 631-9000 |
| Industrial Radio Lodge 1561-Ia 3006 Hamilton Ave, Baltimore 21214 | (410) 254-0500 |
| Industrial Union Of Marine 719 E Fort Ave, Baltimore 21230 | (410) 752-3333 |
| Industrial Union Of Marine 28 111 Cherry Hill Rd, Baltimore 21225 | (410) 355-2502 |
| International Association-Mach 3006 Hamilton Ave, Baltimore 21214 | (410) 426-0516 |
| International Chemical Workers 500 E Patapsco Ave, Baltimore 21225 | (410) 355-8551 |
| International Longshoremen's 1104 Hull St, Baltimore 21230 | (410) 752-4547 |
| International Longshoremen's 1345 Hull St, Baltimore 21230 | (410) 727-0578 |
| International Longshoremen's 900 Oldham St, Baltimore 21224 | (410) 675-8499 |
| International Union Local 37 5901 Harford Rd # A, Baltimore 21214 | (410) 254-2030 |
| Laborers International Union 4603 York Rd, Baltimore 21212 | (410) 323-2005 |
| Laborers International Union 609 N Eutaw St, Baltimore 21201 | (410) 332-1600 |
| Maryland Correctional Union 2519 N Calvert St, Baltimore 21218 | (410) 235-8540 |
| Memorial Lodge 1784 Intl Assn 3006 Hamilton Ave, Baltimore 21214 | (410) 254-7842 |
| Oriole Branch 2701 W Patapsco Ave # 105, Baltimore 21230 | (410) 525-2444 |
| Painters Local Union 1af Of L 518 S Broadway, Baltimore 21231 | (410) 276-5960 |
| Baltimore Carpenters Council 1407 Rome Rd, Baltimore 21227 | (410) 737-9670 |
| Baltimore County Classified 28 E Susquehanna Ave, Baltimore 21286 | (410) 821-9299 |
| Baltimore County Federation 25 W Chesapeake Ave # 208, Baltimore 21204 | (410) 296-1875 |
| Baltimore Newspaper Graphic 7 Leslie Ave, Baltimore 21236 | (410) 882-6900 |
| Baltimore Pipe Trades Federal 7830 Philadelphia Rd, Baltimore 21237 | (410) 866-3651 |
| Bricklayers & Allied Craftwork 1718 Dundalk Ave, Baltimore 21222 | (410) 633-9052 |
| Seafarer's International Union 2315 Essex St, Baltimore 21224 | (410) 327-4900 |
| Seiu Md Dc State Council 605 N Eutaw St, Baltimore 21201 | (410) 547-6991 |
| Sheet Metal Workers Local 100 4705 Erdman Ave, Baltimore 21205 | (410) 732-1849 |
| State Council 54 613 N Eutaw St, Baltimore 21201 | (410) 547-6991 |
| Steelworkers Hall 540 Dundalk Ave, Baltimore 21224 | (410) 633-7400 |
| Teamsters Local 570 Union 6910 Eastern Ave, Baltimore 21224 | (410) 284-5081 |
| Truck Drivers & Helpers 1030 S Dukeland St, Baltimore 21223 | (410) 566-5700 |
| Uaw 1010 S Holdham St, Baltimore 21224 | (410) 276-8790 |
| Uaw 2122 Broening Hwy, Baltimore 21224 | (410) 276-5022 |
| Uaw Federal Credit Union 1811 Portal St, Baltimore 21224 | (410) 633-1993 |
| Uaw Region 8 1103 N Point Blvd, Baltimore 21224 | (410) 284-1500 |
| Unite Here 9 W Mulberry St, Baltimore 21201 | (410) 659-2191 |
| United Automobile Workers 239 1010 Oldham St, Baltimore 21224 | (410) 276-8789 |
| United Food Commercial Workers 1425 Woodall St, Baltimore 21230 | (410) 539-2483 |
| United Furniture Workers Afl 416 E 31st St, Baltimore 21218 | (410) 235-0208 |
| United Steelworkers Of America 550 Dundalk Ave, Baltimore 21224 | (410) 633-9220 |
| United Union Of Security Guard 2701 W Patapsco Ave # 107, Baltimore 21230 | (410) 646-3120 |
| Distillery Workers Union Local 1335 Linden Ave, Baltimore 21227 | (410) 242-2966 |
| Washington-Baltimore Newspaper 415 Saint Paul Pl, Baltimore 21202 | (410) 752-6930 |
| Graphic Communications Intl 7701 Belair Rd, Baltimore 21236 | (410) 668-8185 |
| Iron Workers 2008 Merritt Ave, Baltimore 21222 | (410) 284-4750 |
| Ironworkers Apprentice Trng 2008 Merritt Ave, Baltimore 21222 | (410) 282-6650 |
| Laborers District Council 8600 Lasalle Rd # 114, Baltimore 21286 | (410) 823-8388 |
| Local 130 Iue-Afl-Cio Intl Unn 1335 Linden Ave, Baltimore 21227 | (410) 247-1233 |
| United Auto Aerospace & Agricl 3 Riverton Rd, Baltimore 21220 | (410) 686-9292 |
| United Food & Commercial Wrkrs 21 West Rd, Baltimore 21204 | (410) 337-2700 |
| United Steelworkers Of America 8019 Corporate Dr # H, Baltimore 21236 | (410) 931-6900 |