Illgau is a municipality in Schwyz District in the canton of Schwyz in Switzerland. Illgau is first mentioned in 1370 as Ilgoe. Illgau has an area, as of 2006, of 10.9 km2. Of this area, 62 % is used for agricultural purposes. Of the rest of the land, 2.9% is settled and the remainder is non-productive. It consists of the village sections of Illgau, Vorder Oberberg and Hinter Oberberg as well as scattered farm houses. All of the farm houses, up to about the 1,300 m level are occupied throughout the year. Illgau has a population of 802; as of 2007, 1.6% of the population was made up of foreign nationals. Over the last 10 years the population has grown at a rate of 7%. Most of the population speaks German, with Albanian being second most common and Russian being third; as of 2000 the gender distribution of the population was 49.2 % female. The age distribution, as of 2008, in Illgau is. 241 people or 33.4% are 20 to 39, 166 people or 23.0% are 40 to 64. The senior population distribution is 45 people or 6.2% are 65 to 74.
There are 19 people or 2.6% who are 70 to 79 and 8 people or 1.11% of the population who are over 80. As of 2000 there are 248 households. 31 or about 12.5% are large households, with at least five members. In the 2007 election the most popular party was the SVP; the next three most popular parties were the CVP, the SPS and the FDP. The entire Swiss population is well educated. In Illgau about 55.2% of the population have completed either non-mandatory upper secondary education or additional higher education. Illgau has an unemployment rate of 0.96%. As of 2005, there were 70 people employed in the primary economic sector and about 28 businesses involved in this sector. 63 people are employed in the secondary sector and there are 8 businesses in this sector. 71 people are employed with 14 businesses in this sector. From the 2000 census, 698 or 96.8% are Roman Catholic, while less than 5 people belonged to the Swiss Reformed Church. There are 6. 9 belong to no church, are agnostic or atheist, 6 individuals did not answer the question.
The Urnerboden is a village in the high valley of Urner Boden, an alp and a small high Alpine permanent settlement in the Swiss canton of Uri. At 8 kilometres in length, it is believed to be the largest alp in Switzerland, it forms a disconnected part of the municipality of Spiringen, separated from the rump of that municipality by some 8 kilometres of the municipality of Unterschächen and by the Klausen Pass. The Urner Boden is traversed by the eastern approach road to the Klausen Pass to the west, from the village of Linthal in the canton of Glarus; the Klausen Pass provides the only direct connection to the rest of the municipality of Spiringen and canton of Uri that lie to the west of the pass. The pass road is closed between October and May, during this period the Urner Boden is only accessible from the east via Linthal, involving a road journey between the two halves of the municipality of some 126 kilometres. In summer, PostBus Switzerland operates a bus service which provides several daily return journeys to Linthal and Spiringen.