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In page Hesse:

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Since approximately World War II, a spoken variety of Standard German with dialect substrate has been superseding the traditional dialects mentioned so far. This development knows a north-to-south movement, the north being early to supplant the traditional language, whereas in the south, there is still a considerable part of the population that communicates in South Hessian. In most of the areas, however, the traditional language is close to extinction, whereas until the first half of the 20th century, almost the entire population spoke dialect in almost all situations. The Upper Class started to speak Standard German beginning in the late 19th century, so for decades, the traditional language served as a sociolect.[citation needed]