How Can We Help?
ShortTermMissions.com
P.O. Box 16446
St. Louis, MO 63125
Telephone: 479-530-5987
Email: info@ShortTermMissions.com
As of early September 2018, their website shows 116 organizations that sponsor 1,373 short-term mission trips from one week to three years throughout the world. It has a lot of articles and other background information. They are closely associated with M-DAT (described in the General Humanitarian Organizations category of this HelpingWorldwide website).