Biberstein () is a municipality in the district of Aarau of the canton of Aargau in Switzerland.
thumb|Aerial view (1954)
Geography
Biberstein is located on the north bank of the Aar River near Aarau. The town is a 17-minute bus ride from downtown Aarau. The neighboring communities are Auenstein to the east, Küttigen to the west, Rohr to the south, Rupperswil to the south-east and Thalheim to the north-east. The community of Biberstein occupies of which is wooded.
Biberstein has an area, , of . Of this area, 34.8% is used for agricultural purposes, while 50.6% is forested. Of the rest of the land, 10% is settled (buildings or roads) and the remainder (4.6%) is non-productive (rivers or lakes). In the 13th century the Count of Habsburg-Laufenburg built a castle, Schloss Biberstein, and the surrounding village to limit the territorial expansion of the Counts of Kyburg. The castle's position on the banks of the Aar River allowed them to collect tolls on the Aar ship traffic. Near the castle there was also a ferry that operated between Biberstein and Rohr until the beginning of the Second World War when it was replaced with a bridge.
Demographics
Biberstein has a population (as of ) of . , 10.2% of the population was made up of foreign nationals. Over the last 10 years the population has grown at a rate of 24.1%. Most of the population () speaks German (94.7%), with English being second most common ( 1.0%) and Albanian being third ( 0.8%).
The age distribution, , in Biberstein is; 130 children or 9.6% of the population are between 0 and 9 years old and 111 teenagers or 8.2% are between 10 and 19. Of the adult population, 123 people or 9.1% of the population are between 20 and 29 years old. 159 people or 11.8% are between 30 and 39, 226 people or 16.7% are between 40 and 49, and 251 people or 18.6% are between 50 and 59. The senior population distribution is 197 people or 14.6% of the population are between 60 and 69 years old, 123 people or 9.1% are between 70 and 79, there are 30 people or 2.2% who are between 80 and 89, and there are 3 people or 0.2% who are 90 and older.
, there were 28 homes with 1 or 2 persons in the household, 168 homes with 3 or 4 persons in the household, and 230 homes with 5 or more persons in the household. The average number of people per household was 2.42 individuals.
In the 2007 federal election the most popular party was the SVP which received 30.4% of the vote. The next three most popular parties were the SP (25.7%), the FDP (16.2%) and the Green Party (9.8%).
Sights
The village of Biberstein is designated as part of the Inventory of Swiss Heritage Sites.
Economy
, Biberstein had an unemployment rate of 0.72%. , there were 24 people employed in the primary economic sector and about 8 businesses involved in this sector. 9 people are employed in the secondary sector and there are 5 businesses in this sector. 162 people are employed in the tertiary sector, with 25 businesses in this sector.
Religion
From the , 236 or 21.4% are Roman Catholic, while 678 or 61.6% belonged to the Swiss Reformed Church. Of the rest of the population, there are 2 individuals (or about 0.18% of the population) who belong to the Christian Catholic faith.