Sins is a municipality in the district of Muri in the canton of Aargau in Switzerland. Sins has an area, as of 2009, of 20.3 square kilometers…Sins is a municipality in the district of Muri in the canton of Aargau in Switzerland. Sins has an area, as of 2009, of 20.3 square kilometers. Of this area, 14.64 km² or 72.1% is used for agricultural purposes, while 3.54 km² or 17.4% is forested. Of the rest of the land, 1.95 km² or 9.6% is settled, 0.1 km² or 0.5% is either rivers or lakes and 0.01 km² or 0.0% is unproductive land.