Ziefen is a municipality in the district of Liestal in the canton of Basel-Country in Switzerland.

Ziefen has an area, as of 2009[update], of 7.8 square kilometers (3.0 sq mi).

Of the rest of the land, 0.66 km2 (0.25 sq mi) or 8.5% is settled (buildings or roads), 0.03 km2 (7.4 acres) or 0.4% is either rivers or lakes.

[3] The blazon of the municipal coat of arms is Argent, an Eagle displayed Sable fesswise, langued, beaked and membered Or.

[7] Most of the population (as of 2000[update]) speaks German (1,269 or 94.1%), with Albanian being second most common (23 or 1.7%) and French being third (15 or 1.1%).

[8] As of 2008[update], the gender distribution of the population was 50.1% male and 49.9% female.

[6] The age distribution, as of 2010[update], in Ziefen is; 122 children or 7.9% of the population are between 0 and 6 years old and 293 teenagers or 19.0% are between 7 and 19.

[7] The historical population is given in the following chart:[12] The House with Heimposamenterei is listed as a Swiss heritage site of national significance.

The entire village of Ziefen is part of the Inventory of Swiss Heritage Sites.

[13] In the 2007 federal election the most popular party was the SVP which received 28.85% of the vote.

In the federal election, a total of 562 votes were cast, and the voter turnout was 54.0%.

[7] There were 663 residents of the municipality who were employed in some capacity, of which females made up 41.9% of the workforce.

In the tertiary sector; 26 or 29.9% were in wholesale or retail sales or the repair of motor vehicles, 2 or 2.3% were in a hotel or restaurant, 2 or 2.3% were in the information industry, 14 or 16.1% were technical professionals or scientists, 11 or 12.6% were in education and 4 or 4.6% were in health care.

[7] From the 2000 census[update], 185 or 13.7% were Roman Catholic, while 840 or 62.3% belonged to the Swiss Reformed Church.