On the Main itself, log drivers floated wood from the Frankenwald (forest) down to the Rhine and even as far as Rotterdam.
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In Zapfendorf is found Werk IV of the Bayerische Milchindustrie eGmbH (BMI for short, the “Bavarian Milk Industry”), which was founded in 1952 with the goal of processing and marketing the excess low-fat milk yield.
The first mention of Frohnlach was in the year 1260 when the founder of the Sonnefeld Monastery, Graf Count Henry II von Sonneberg, bought the village of “Otnandus de sleten” (from Kirchschletten near Zapfendorf).