| Global Volunteers St Paul, MN | 800-487-1074 |
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| Alpine Interface Montville, CT | 800-368-5056 |
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| Volunteers For Peace Over 100 Countries, VT | 802-259-2759 |
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| Kindred Spirits Tour & Travel Empire, CO | 877-589-8860 |
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| Grasshopper Adventures Phranakorn Bangkok, Thailand | 66-87-929-5208 |
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| Elite World Tours Naugatuck, CT | 888-723-0208 |
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| Senior Corps Washington, DC | 202-606-6818 |
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| Thomson Safaris Watertown, MA | 800-235-0289 |
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| Chefs for Humanity New York, NY | 000-000-0000 |
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| Volunteer Vacation Safari Reston, VA | 866-ECO-RESORTS |
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| United Planet Boston, MA | 800-292-2316 |
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| Hands Up Holidays London, England | 44-0207-193-1062 |
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| Global Citizens Network St Paul, MN | 800-644-9292 |
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| Global Service Corps San Francisco, CA | 415-788-3666 |
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| Enkosini Eco Experience Seattle, WA | 206-604-2664 |
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| CultureXplorers Philadelphia, PA | 866-877-2507 |
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| IIPT - International Institute for Peace Through Tourism Stowe, VT | 802-253-2658 |
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| Operation Loango , Netherlands | 31-26-370-5567 |
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| South African Friends Mossel Bay, South Africa | 27-444981269 |
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| Abercrombie & Kent Oak Brook, IL | 630-954-2944 |
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| Biosphere Expeditions Marina Del Rey, CA | 800-407-5761 |
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| Mali Volunteer Vacation Bandiagara Mali, Africa | 614-595-1864 |
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| Relief Riders International Various Locations Rajasthan, India | 413-329-5876 |
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| Summer Volunteer Program Otavalo Imbabura, Ecuador | 614-595-1864 |
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| Volunteer Vacations Avalon, CA | 310-510-2595 |
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