The Swartzentruber Amish are the most well-known and one of the largest and the most conservative subgroups of Old Order Amish. Swartzentruber Amish are considered a subgroup of the Old Order Amish, although they do not fellowship or intermarry with more liberal Old Order Amish. They speak Pennsylvania German as their mother tongue as well as English (with outsiders).
Swartzentruber Amish formed as the result of a division that occurred among the Amish of Holmes County, Ohio in the years 1913–1917. The bishop who broke away was Sam E. Yoder. The Swartzentruber name was applied later, named after bishop Samuel Swartzentruber who succeeded him. In 1932 there was a split among the Swartzentrubers that resulted in the formation the Troyer Amish in Wayne County, Ohio. In the early 1980s several church districts in Minnesota, Tennessee, and Ohio split from the Swartzentruber church districts elsewhere because of disagreements over shunning ("Bann und Meidung"). This group, known as the "Jeck Jeckey Leit" is now affiliated with the Nebraska Amish. In the 1990s two more splits occurred, resulting in three Swartzentruber Amish groups: the Joe Troyer group, the main group, the Mose Miller/Isaac Keim group and the Andy Weaver group. The Swartzentruber Andy Weaver group should not be confused with the Old Order Andy Weaver group. In this three-way split the Andy Weaver group is the most conservative while the Joe Troyer group is at the other end of the spectrum, leaving the Mose Miller group somewhere in between.
Riding in cars is prohibited among the Swartzentruber Amish, except in emergencies, whereas average Old Order Amish are allowed to use cars as long as they do not own them. Swartzentrubers are the most restrictive concerning the use of technologies among all Amish affiliations, see table below.
* Natural gas allowed
Their style of dress tends to be heavier and plainer, especially in the case of women, only the Nebraska Amish dress in a more conservative style. Swartzentruber services tend to be longer, even up to four hours.
Like some other Old Order groups, they avoid the use of electricity and indoor plumbing. Many other common devices and technologies are also disallowed for being too worldly, including Velcro and bicycles. Swartzentruber farms and yards are often unkempt. The Swartzentrubers discourage interest in outward appearance, as such an interest could promote vanity and pride. Their farms can be identified by dirt drives and surrounding roads, while most roads of the Old Order contain either gravel or paving to keep out the mud. The roofs of the houses and outbuildings are often made of tin. The clothing differs from that of the other Old Order Amish in subtle ways: all colors are dark and somber rather than the bright blues and mauves; more common is navy, dark burgundy, and even gray. The dresses of the women, rather than reaching mid-calf, usually reach to the top of the shoes. The tack on the horses and buggies is often all black, rather than brown leather.