Erlinsbach is a municipality in the district of Aarau of the canton of Aargau in Switzerland. History Erlinsbach is first mentioned in 1173 as Arnlesbah. In 1220 it was mentioned as Erndespah and in the 14th Century it was known as Erlispach. During the Middle Ages the hamlets of Obererlinsbach and Niedererlinsbach were part of Erlinsbach. They are now in the Canton of Solothurn. In the 14th Century, the hamlet of Edliswil was abandoned, however its exact location is currently unknown. In the 15th or 16th Century, the hamlet of Hard was founded. Geography Erlinsbach has an area, , of . Of this area, 34.7% is used for agricultural purposes, while 53.8% is forested. Of the rest of the land, 10.6% is settled (buildings or roads) and the remainder (0.9%) is non-productive (rivers or lakes). The municipality is located in the Aarau district between the Aare river and Jura Mountains on the border with the Canton of Solothurn. It is near the Salhöhe Pass, a regionally important route over the Jura Mountains. It consists of the village of Erlinsbach and the hamlet of Hard. Coat of arms The blazon of the municipal coat of arms is Divided by Bend wavy Argent in Or a Bend sinister Sable and Azure a Mullet of Five of the first. Demographics Erlinsbach has a population (as of ) of . , 14.9% of the population was made up of foreign nationals. Over the last 10 years the population has grown at a rate of 8.1%. Most of the population () speaks German (90.3%), with Serbo-Croatian being second most common (2.7%) and Italian being third (1.7%). The age distribution, , in Erlinsbach is; 359 children or 10.3% of the population are between 0 and 9 years old and 384 teenagers or 11.0% are between 10 and 19. Of the adult population, 369 people or 10.6% of the population are between 20 and 29 years old. 391 people or 11.2% are between 30 and 39, 588 people or 16.9% are between 40 and 49, and 496 people or 14.2% are between 50 and 59. The senior population distribution is 444 people or 12.8% of the population are between 60 and 69 years old, 280 people or 8.0% are between 70 and 79, there are 147 people or 4.2% who are between 80 and 89, and there are 23 people or 0.7% who are 90 and older.