[3] On 1 January 2013, Lüsslingen and Nennigkofen merged to form Lüsslingen-Nennigkofen.

[4] On 1 January 2014 the former municipalities of Tscheppach, Brügglen, Aetingen, Aetigkofen, Bibern (SO), Gossliwil, Hessigkofen, Mühledorf (SO), Küttigkofen and Kyburg-Buchegg merged into the municipality of Buchegg.

Bucheggberg district has an area, as of 2009[update], of 62.81 square kilometers (24.25 sq mi).

Of the rest of the land, 5.35 km2 (2.07 sq mi) or 8.5% is settled (buildings or roads), 0.53 km2 (0.20 sq mi) or 0.8% is either rivers or lakes and 0.04 km2 (9.9 acres) or 0.1% is unproductive land.

[6] The blazon of the municipal coat of arms is Or three Roses Gules barbed and seeded proper in pale.

[1] Most of the population (as of 2000[update]) speaks German (6,909 or 97.4%), with French being second most common (63 or 0.9%) and English being third (15 or 0.2%).

[8] The historical population is given in the following chart:[11] In the 2007 federal election the most popular party was the FDP which received 33.63% of the vote.

In the federal election, a total of 3,113 votes were cast, and the voter turnout was 53.5%.

[12] From the 2000 census[update], 793 or 11.2% were Roman Catholic, while 5,269 or 74.3% belonged to the Swiss Reformed Church.