Zofingen () is a city in the canton of Aargau in Switzerland. It is the capital of the district of Zofingen. Zofingen is a walled city and home of an ancient monastic settlement. History In ancient times Zofingen was a settlement of the Celtic Helvetii. In later times the Romans built a manor. The Alemanni settled in the 6th century and formed one of the oldest parishes in Aargau. In the 11th century the House of Frohburg founded a canons monastery. The town was founded in 1201 by the counts of Frohburg. 1231 was the first written mention of Zofingen, which in 1299 came in the possession of the Habsburgs. In 1415 the Bernese conquered the city and in 1528 they introduced the Reformation. Since 1803 Zofingen has belonged to the canton of Aargau and has become a regional center. The neighboring Mühlethal was incorporated in 2002. Geography Zofingen has an area, , of . Of this area, or 18.8% is used for agricultural purposes, while or 47.3% is forested. Of the rest of the land, or 33.1% is settled (buildings or roads), or 0.6% is either rivers or lakes. Of the built up area, industrial buildings made up 4.6% of the total area while housing and buildings made up 17.7% and transportation infrastructure made up 7.0%. while parks, green belts and sports fields made up 3.1%. Out of the forested land, 46.0% of the total land area is heavily forested and 1.4% is covered with orchards or small clusters of trees. Of the agricultural land, 4.3% is used for growing crops and 12.2% is pastures, while 2.3% is used for orchards or vine crops. All the water in the municipality is flowing water. The municipality of Uerkheim is considering a merger on 1 January 2014 into Zofingen. Coat of arms The blazon of the municipal coat of arms is Barry of Four Gules and Argent. Demographics Zofingen has a population () of . , 15.8% of the population are foreign nationals. Over the last 10 years (1997–2007) the population has changed at a rate of 14.7%. Most of the population () speaks German (88.9%), with Italian being second most common ( 3.4%) and Portuguese being third ( 1.4%). The age distribution, , in Zofingen is; 895 children or 8.4% of the population are between 0 and 9 years old and 1,010 teenagers or 9.5% are between 10 and 19.