[1] Porrentruy is divided into a total of 20 municipalities: The blazon of the district coat of arms is Gules a Fess Argent, overall a Cockatrice Or volant holding in legs and beak a Crosier of the same.

[1] Most of the population (as of 2000[update]) speaks French (22,008 or 91.8%) as their first language, German is the second most common (1,001 or 4.2%) and Italian is the third (306 or 1.3%).

The historical population is given in the following chart:[6] In the 2007 federal election the most popular party was the CVP which received 33.81% of the vote.

[11] From the 2000 census[update], 18,473 or 77.1% were Roman Catholic, while 2,423 or 10.1% belonged to the Swiss Reformed Church.

This is followed by three years of obligatory lower Secondary school where the students are separated according to ability and aptitude.

[12] During the 2009-10 school year, there were a total of 1,955 students attending 117 classes in Porrentruy.