Affiliated fairs are members of the Society for Science network. These competitions exist in nearly every state in the United States as well as over 70 other countries, regions and territories. Fairs are conducted at local, regional, state and national levels and can be affiliated with the International Science and Engineering Fair (ISEF) and/or the Broadcom MASTERS. To compete at ISEF, a 9th-12th grade student must first win the honor through participation at a Society-affiliated fair. Each affiliated fair has a designated number of projects (individual or team) that they may support to come to ISEF.
Fairs affiliated with the Society for the Broadcom MASTERS are eligible to name the top 10% of their 6th - 8th grade participants as Broadcom MASTERS nominees.
Most science fairs in the U.S. and U.S. territories are held from January through March. Fairs outside the U.S. may take place at other times of the year. Students who participate in these fairs must observe the International Rules for Pre-college Science Research.