Bern. The construction of the Wynentalbahn railway in 1904 promoted the settlement of local industries. Coat of arms The blazon of the municipal coat of arms is Per bend sinister Or and Azure a Bend counterchanged. Points of interest The castle of Liebegg resides on a hill close to the border to Teufenthal, about three kilometers south-south-east of the village center. The Castle, which dates from the 11th century, is nowadays used as a center for culture, meetings and congresses. Near the village center one finds the "Chornhaus", which, built in 1695, looks very similar to a small castle, because of its tower. Until 1798 it served as a granary and was thereafter used by the municipal administration department for over a century. Since the new parish hall was completed in 1995 it contains a small village museum. The Reformed Church was built from 1661 to 1663 on the site where the previous church had collapsed. It is one of the main works of Protestant church building in the canton of Aargau, and is listed as a heritage site of national significance. The other heritage site of national significance in Gränichen is the Untervogthaus on Lochgasse. Population Gränichen has a population (as of ) of . , 17.6% of the population was made up of foreign nationals. Over the last 10 years the population has grown at a rate of 6.8%. Most of the population () speaks German (90.2%), with Italian being second most common ( 4.1%) and Albanian being third ( 1.5%). Of the rest, 1.1% spoke Serbo Croatian and 0.7% spoke Turkish. The age distribution, , in Gränichen is; 580 children or 9.0% of the population are between 0 and 9 years old and 804 teenagers or 12.5% are between 10 and 19. Of the adult population, 691 people or 10.7% of the population are between 20 and 29 years old. 774 people or 12.0% are between 30 and 39, 1,174 people or 18.2% are between 40 and 49, and 956 people or 14.8% are between 50 and 59. The senior population distribution is 674 people or 10.5% of the population are between 60 and 69 years old, 503 people or 7.8% are between 70 and 79, there are 251 people or 3.9% who are between 80 and 89, and there are 37 people or 0.6% who are 90 and older. , there were 140 homes with 1