Sinn lies at a height of 185 to 356 m (607 to 1,168 ft) above sea level at the foot of the Westerwald range, 3 km (1.9 mi) south of Herborn in the Dill valley.

The community consists of the following centres: The Dill valley's fertile slopes and dales were settled quite early on.

Archaeological finds in the countryside around Edingen range through all epochs and have led to the conclusion that the area has been permanently settled since the 4th century BC.

Encouraged by the mining in the Sieg-Dill area, an ironworks came to town and set up shop, soon followed by foundries and metalworking businesses.

The site is believed to have been settled by early Germanic times, as witnessed by finds from the 4th century BC, and the name is also a clue to this.

Villa Haas is a manor house in the style of German Renaissance Revival architecture built in 1892.

The villa, the park and the surrounding streets "Hansastrasse / Rudolfstrasse" are cultural monuments due to their historical and artistical significance.