Sissach district has an area, as of 2009[update], of 141 square kilometers (54 sq mi).

Of the rest of the land, 15.06 km2 (5.81 sq mi) or 10.7% is settled (buildings or roads), 0.25 km2 (0.097 sq mi) or 0.2% is either rivers or lakes and 0.13 km2 (32 acres) or 0.1% is unproductive land.

[3] Most of the population (as of 2000[update]) speaks German (28,263 or 91.1%), with Italian language being second most common (730 or 2.4%) and Albanian being third (396 or 1.3%).

[4] As of 2008[update], the gender distribution of the population was 49.7% male and 50.3% female.

The total Swiss population change in 2008 (from all sources, including moves across municipal borders) was an increase of 337 and the non-Swiss population change was an increase of 141 people.

[3] The age distribution, as of 2010[update], in the district is; 2,215 children or 6.6% of the population are between 0 and 6 years old and 4,948 teenagers or 14.7% are between 7 and 19.

[6] The historical population is given in the following chart:[7] In the 2007 federal election the most popular party was the SVP which received 33.96% of the vote.

In the federal election, a total of 11,808 votes were cast, and the voter turnout was 51.0%.

[8] From the 2000 census[update], 5,874 or 18.9% were Roman Catholic, while 18,685 or 60.2% belonged to the Swiss Reformed Church.