Its name, at first probably "Geisaha", "the bubbling brook", the original name of the small Hombach, indicates that the small side valley of the Mühlbach was settled soon after the Romans had abandoned their protective wall, the Limes, which also runs through the Geisiger Forest. For a long time Geisig belonged to the county and later to the four lords' court on the Einrich and then to the Nassau office. Ecclesiastically Geisig had initially belonged to the old mother church of the Einrich in Marienfels, before it was assigned to the parish of Dornholzhausen. The chapel at Geisig is first mentioned in 1480. However, it is very likely that a place of prayer, possibly even a pagan place of worship, had already been here before that. The church dates back to the 16th century, i.e. to the time of the Reformation, and was built by an ancestor of the famous Barons vom und zum Stein. A mill was first built near Geisig in 1564; at times four mills were operated. The village had thirteen inhabitants in 1526. Already in 1658 there were 56 inhabitants and in 1871 with 348 almost the present number of 360 inhabitants was reached. The Taunus commune has an area of 412 ha, of which 120 ha are woods and 237 ha are agricultural land, which is managed by 5 full-time farms and some part-time farms.
Lies about 250 m above sea level, on the left and right of the Hombach