As part of the vault experiment, all jumpsuit extruders in this vault failed after 6 months. The eventual total lack of clothing, combined with Mormon religious sensibilities, resulted in the single largest block of social data collected during the vault program.
The following is based on Van Buren and is not canon.
In 2062, many Mormon congregations came together to purchase places in Vault 70. The vault was opened in 2190, and its inhabitants founded the town of New Jerusalem.