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

[3] Selzach has an area, as of 2009[update], of 19.48 square kilometers (7.52 sq mi).

Of the rest of the land, 1.79 km2 (0.69 sq mi) or 9.2% is settled (buildings or roads), 0.34 km2 (0.13 sq mi) or 1.7% is either rivers or lakes and 0.11 km2 (27 acres) or 0.6% is unproductive land.

It consists of the village of Selzach, the hamlet of Haag and former city of Altreu.

The blazon of the municipal coat of arms is Gules a Salt Cellar Argent.

[8] Most of the population (as of 2000[update]) speaks German (2,600 or 92.5%), with French being second most common (37 or 1.3%) and Italian being third (33 or 1.2%).

[7] The age distribution, as of 2000[update], in Selzach is; 210 children or 7.5% of the population are between 0 and 6 years old and 444 teenagers or 15.8% are between 7 and 19.

The greatest number of single family homes (109) were built between 1961 and 1970.

[8] The historical population is given in the following chart:[3][13] The medieval ruined city of Altreu, is listed as a Swiss heritage site of national significance.

[14] In the 2007 federal election the most popular party was the SVP which received 32.98% of the vote.

In the federal election, a total of 1,026 votes were cast, and the voter turnout was 47.8%.

[8] There were 1,511 residents of the municipality who were employed in some capacity, of which females made up 41.6% of the workforce.

The number of jobs in the primary sector was 81, of which 70 were in agriculture and 11 were in forestry or lumber production.

In the tertiary sector; 77 or 39.1% were in wholesale or retail sales or the repair of motor vehicles, 7 or 3.6% were in the movement and storage of goods, 27 or 13.7% were in a hotel or restaurant, 5 or 2.5% were in the information industry, 10 or 5.1% were the insurance or financial industry, 13 or 6.6% were technical professionals or scientists, 27 or 13.7% were in education and 7 or 3.6% were in health care.

[8] From the 2000 census[update], 1,192 or 42.4% were Roman Catholic, while 945 or 33.6% belonged to the Swiss Reformed Church.