Kammersrohr is a municipality in the district of Lebern in the canton of Solothurn in Switzerland.

The municipality, located in the Lebern district, is the smallest municipality in Switzerland, both in population and surface area and is situated on a terrace in the southern foothills of the Jura Mountains.

[4] The blazon of the municipal coat of arms is Argent a Mullet Gules between two Reed plants Vert fructed Sable and with two leaves each issuant from a Mount of 3 Coupeaux of the third.

[8] Most of the population (as of 2000[update]) spoke German (37 or 94.9%), with the rest speaking English (1 or 2.6%) and Polish (1 or 2.6%).

[9] In 2008[update] the total Swiss population change (from all sources, including moves across municipal borders) was a decrease of three people and the non-Swiss population decreased by one person.

Of the rest of the households, there were three married couples without children, and five married couples with children[9] In 2000[update] there were 11 single-family homes (78.6% of the total) out of 14 inhabited buildings.

[8] The historical population is shown in the following chart:[3][12] In the 2007 federal election the most popular party was the Christian Democratic People's Party of Switzerland (CVP) which received 41.18% of the vote.

In the federal election, a total of 22 votes were cast, representing a 53.7% voter turnout.

[8] Twenty residents of the municipality were employed in some capacity, of which females made up 30.0% of the workforce.

There were three jobs in the tertiary sector, of which one (33.3%) was in the sale or repair of motor vehicles, and two (66.7%) were technical professionals or scientists.

[8] From the 2000 census[update], 18 people (46.2%) were Roman Catholic, while 14 (35.9%) belonged to the Swiss Reformed Church.