Gr�nna has a population of 2,578 (2005) and was founded in 1652 by Count Per Brahe.
The town is situated at the foot of Gr�nna mountain and is characterized by its steep streets and old wooden houses.
Up until the local government reform of 1971 Gr�nna and its immediate surroundings constituted a city municipality of its own, since then it has become an integral part of J�nk�ping Municipality.
Gr�nna is, despite its small population, for historical reasons often still referred to as a city. Statistics Sweden, however, only counts localities with more than 10,000 inhabitants a cities.
Gr�nna is known for its red and white polkagris (literally "polka pig" in Swedish) stick candy, also known as peppermint rock. This was first made by the widow Amalia Eriksson in 1859. A statue of Amalia can now be seen in the park at the foot of Gr�nna mountain. The town is popular with tourists and is a connection point for the ferry service to the island Visings�.
The balloonist Salomon August Andr�e, who died in an attempt to reach the North Pole by balloon, was born in Gr�nna. The Grenna Museum hosts an exhibition of the expedition together with a comprehensive collection of related objects and photos
