Rapperswil-Jona is a municipality in the Wahlkreis (constituency) of See-Gaster in the canton of St. Gallen in Switzerland. Besides Rapperswil and Jona, which were separate municipalities until 2006, the municipality includes Bollingen, Busskirch, Curtiberg, Kempraten-Lenggis, Wagen, and Wurmsbach. The official language of Rapperswil is (the Swiss variety of Standard) German, but the main spoken language is the local variant of the Alemannic Swiss German dialect. Wikipedia