An alumni chapter in Tallinn was established in 1921.

At one point, there were over 165 alumni chapters, some as far away as China.

Individual alumni chapters still exercise significant power over chapter governance.

There is still an alumni chapter that holds a reunion every 10 years, the first being held in 1997.

Of the forty-three alumni chapters and clubs that have been established in the United States, thirteen are active.

The alumni chapters provide educational and networking opportunities for members.

Many alumni chapters use the more common office titles such as: president, vice-president, secretary, and treasurer.

As of 2011, Sigma Chi has 149 alumni chapters around the world.

Thunderbird has more than 40,000 alumni and 150 alumni chapters in 141 countries throughout the world.

At the University of Bridgeport, alumni chapters are being formed.