The district lies to the south of Basel-Country, bordering the canton of Solothurn.

Waldenburg district has an area, as of 2009[update], of 104.93 square kilometres (40.51 sq mi).

Of the rest of the land, 7.69 km2 (2.97 sq mi) or 7.3% is settled (buildings or roads), 0.21 km2 (0.081 sq mi) or 0.2% is either rivers or lakes and 0.07 km2 (17 acres) or 0.1% is unproductive land.

[3] Most of the population (as of 2000[update]) speaks German (13,765 or 90.9%), with Italian language being second most common (357 or 2.4%) and Albanian being third (280 or 1.8%).

The total Swiss population change in 2008 (from all sources, including moves across municipal borders) was a decrease of 49 and the non-Swiss population change was an increase of 33 people.

[3] The age distribution, as of 2010[update], in the district is; 1,044 children or 6.7% of the population are between 0 and 6 years old and 2,581 teenagers or 16.5% 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 39.28% of the vote.

In the federal election, a total of 5,408 votes were cast, and the voter turnout was 50.0%.

[8] From the 2000 census[update], 2,714 or 17.9% were Roman Catholic, while 8,987 or 59.3% belonged to the Swiss Reformed Church.