Until 1564, Dreikirchen belonged to the Nassau Counts’ domain, after which it passed to the Electorate of Trier. In the 19th century, it belonged to the Duchy of Nassau and thereafter to the Prussian province of Hesse-Nassau. Each of these is documented by an heraldic tincture, namely blue for the community's main membership in Nassau, and red for the Electorate of Trier. Here is also found the community's name in the three stylized silver steeples. The middle and predominant tower refers to the fortress church from the 12th century, the one on the left stands for the chapel in Oberhausen, and the one on the right once again symbolizes unity in depicting the parish church, which was meant to serve both former communities.