| Business | Phone |
| Afl Cio Outplacement Abitibi 15628 Garrett Rd, Houston 77044 | (281) 456-0773 |
| Afl-Cio 2506 Sutherland St, Houston 77023 | (713) 923-9473 |
| Alpa 3808 World Houston Pkwy A, Houston 77032 | (281) 987-3636 |
| American Federation-State Empl 2600 Hamilton St 121, Houston 77004 | (713) 928-3738 |
| American Federation-Tv & Radio 2020 North Loop W, Houston 77018 | (713) 686-4614 |
| American Maritime Officers 1717 Turning Basin Dr 450, Houston 77029 | (713) 659-8836 |
| American Postal Workers Union 102 W Tidwell Rd, Houston 77022 | (713) 691-0235 |
| American Postal Workers Union 256 N Sam Houston Pkwy E # 112, Houston 77060 | (281) 405-9536 |
| American Postal Workers Union 4600 Aldine Bender Rd, Houston 77032 | (281) 227-9800 |
| Amfa Local 18 9001 Airport Blvd, Houston 77061 | (713) 947-0144 |
| Bakery & Confectionery Workers 14602 County Cress Dr, Houston 77047 | (713) 290-1660 |
| Benefit Resource Inc 8441 Gulf Fwy 304, Houston 77017 | (713) 643-9300 |
| Intl Brotherhood-Boilermakers 340 N Sam Houston Pkwy E 210, Houston 77060 | (281) 260-9330 |
| Bricklayers & Allied Craftsmen 1445 North Loop W 175, Houston 77008 | (281) 862-0133 |
| Bricklayers Apprenticeship 9105 Edgebrook St, Houston 77075 | (713) 941-5668 |
| Brotherhood Of Maintenance 350 N Sam Houston Pkwy E 202, Houston 77060 | (281) 931-4443 |
| Carpenters Local Union 551 2600 Hamilton St, Houston 77004 | (713) 659-7851 |
| Chauffeurs Inc 8626 Alcott Dr, Houston 77080 | (713) 465-2152 |
| Communications Workers-America 1520 Pease St, Houston 77002 | (713) 571-7035 |
| Communications Workers-America 1730 Jefferson St, Houston 77003 | (713) 495-0210 |
| Communications Workers-America 333 N Belt Dr E 240, Houston 77060 | (281) 448-3100 |
| Construction Craft Corp 2704 Sutherland St, Houston 77023 | (713) 926-4228 |
| District 2a-Ttwiseu 1221 Pierce St, Houston 77002 | (713) 659-8843 |
| Forever Working Labor Calendar 6100 Hillcroft St 2, Houston 77081 | (713) 984-1555 |
| Meat Cutters & Allied Food 408 4201 Caroline St, Houston 77004 | (713) 526-5121 |
| Masters Mates & Pilots 8150 South Loop E 207, Houston 77017 | (713) 649-8812 |
| Marine Engineers Beneficial 316 Broadway St, Houston 77012 | (713) 923-9424 |
| Gulf Coast District Council 12600 N Featherwood Dr, Houston 77034 | (281) 484-5535 |
| Machinist 4865 Gulf Fwy, Houston 77023 | (713) 928-9318 |
| Harris County Deputies Or 3605 Katy Fwy, Houston 77007 | (713) 802-1096 |
| Local 1 Seiu 4299 San Felipe St 200, Houston 77027 | (713) 403-8800 |
| Local 896 3030 North Fwy, Houston 77009 | (713) 626-3896 |
| Local Union 724 2600 Hamilton St 109, Houston 77004 | (713) 659-1535 |
| Laborers International Union 1717 Turning Basin Dr, Houston 77029 | (713) 672-7755 |
| Houston Alliance Of Postal 2408 Eagle St, Houston 77004 | (713) 528-3603 |
| Houston Black Firefighters 4101 San Jacinto St, Houston 77004 | (713) 524-5640 |
| Houston Bldg & Const Trades 2704 Sutherland St, Houston 77023 | (713) 923-4662 |
| Houston Gulf Coast Building 2704 Sutherland St, Houston 77023 | (713) 926-4433 |
| Houston Paraprofession Staff 5511 Austin St, Houston 77004 | (713) 807-7477 |
| Houston Police Officers Union 1602 State St, Houston 77007 | (713) 237-0283 |
| Houston Police Patrolmen's 1900 North Loop W 540, Houston 77018 | (713) 864-2925 |
| I-A-T-S-E Stage Employees 3030 North Fwy, Houston 77009 | (713) 697-3999 |
| Iacp Labor Union 3808 World Houston Pkwy, Houston 77032 | (281) 227-7159 |
| Iama 6640 Long Point Rd, Houston 77055 | (713) 688-7601 |
| Iatse Local 3030 North Fwy B184, Houston 77009 | (713) 695-8007 |
| Ibew 1445 North Loop W 400, Houston 77008 | (713) 861-5881 |
| Ibew 1475 North Loop W, Houston 77008 | (713) 869-8900 |
| Ila 7437 Avenue L, Houston 77011 | (713) 921-6357 |
| Ila 7811 Harrisburg Blvd, Houston 77012 | (713) 923-1693 |
| Ila Local 7524 Avenue N, Houston 77012 | (713) 923-2839 |
| International Assoc-Machinists 6640 Long Point Rd, Houston 77055 | (713) 686-9464 |
| International Brotherhood 18096 Kings Row Ln Wbstr, Houston 77058 | (281) 333-0423 |
| International Union-Oper Engrs 8441 Gulf Fwy 302, Houston 77017 | (713) 847-0006 |
| Iron Workers 7400 Dahlia St, Houston 77012 | (713) 928-3361 |
| Jatc 2507 Galveston Rd, Houston 77017 | (713) 649-0201 |
| National Assn-Letter Carriers 2414 Broadway St, Houston 77012 | (713) 641-2366 |
| National Maritime Union 1221 Pierce St, Houston 77002 | (713) 571-7871 |