The Aarberg District is a constitutional district of the canton of Bern, Switzerland. While being an administrative district with power, its capital was the town of Aarberg. The district contains 12 municipalities covering an area of 153 km2 (59 sq mi):CH-3270 Aarberg CH-3282 Bargen CH-3257 Grossaffoltern CH-3283 Kallnach CH-3273 Kappelen CH-3250 Lyss CH-3045 Meikirch CH-3283 Niederried bei Kallnach CH-3271 Radelfingen CH-3255 Rapperswil CH-3054 Schüpfen CH-3267 Seedorf