Jönköping County (Jönköpings län) is a county or län in southern Sweden. It borders the counties of Halland, Västra Götaland, Östergötland, Kalmar and Kronoberg. The capital is Jönköping.

The historical provinces of Sweden have no administrative or political significance. Jönköping County is in the northern part of Småland. Habo Municipality and Mullsjö Municipality, from the province of Västergötland, are since 1999 also in Jönköping County.

Jönköping County was periodically united with Kronoberg County until 1687.

The main aim of the County Administrative Board is to fulfill the goals set in national politics by the Parliament and the Government, to coordinate the interests and promote the development of the county, to establish regional goals and safeguard the due process of law in the handling of each case. The County Administrative Board is a Government Agency headed by a Governor. The seat of residence for the Governor or Landshövding is the town of Jönköping. See the List of Jönköping Governors.

Jönköping (Swedish pronunciation: [ˈjœnːˈɕøːpiŋ]) is a city in southern Sweden with 89,396 inhabitants (2010). It is the 9th most populous city of Sweden. Jönköping is situated by the southern end of Sweden's second largest lake, Vättern. The original town Jönköping has grown together with Huskvarna and Norrahammar forming a contiguous urban area, since 1971 wholly within the same municipality.

The city is the seat of Jönköping Municipality which has a population of 128 305 (2011), and also the seat of Jönköping County which has a population of 331,539 (2006). Jönköping is the seat of a district court and a court of appeal as well as the Swedish National Courts Administration. It is also the seat of the Swedish Board of Agriculture.

Jönköping is an old trading center (Köping), since it was located on a crossroad for the roads following along the rivers Nissan and Lagan, and the road between the provinces Östergötland and Västergötland. This was rather natural due to the geographical position of the city at the southern end of lake Vättern, which divided the two counties. On 18 May 1284, Jönköping received rights as a City in Sweden as one of the first communities in the country, by King Magnus Ladulås, who at that time largely ruled the nation from Vättern's largest island Visingsö. In the name of the city "Jön-" is derived from a creek, "Junebäcken", which was situated in the nowadays western part of the city, Talavid. This was the location of the first known settlement in the area. The second part of the name "-köping", as mentioned above, is an old word for a trading center or market place.

Minoo Akhtarzand (born December 1, 1956 in Tehran, Iran) is the current governor of Jönköping County, Sweden.

Minoo Akhtarzand was born and raised in Tehran. Her father was a high rank officer in the Shah's army. At the age of 17 she moved to Stockholm to study at the Royal Institute of Technology. Later she held various managerial posts at the Swedish energy company Vattenfall and was the director of the former regional labour agency in Uppsala. In February 2008 she was appointed Director-General at Banverket, the Swedish Rail Administration. She was elected a Vice-President of European Rail Infrastructure Managers in June 2009. She became the last Director-General of Banverket as that government agency merged with the Swedish Road Administration (Vägverket) in 2010 to create the new Swedish Transport Administration (Trafikverket). In September 2010 she was appointed the governor of Jönköping County.

Gideon Sundback (April 24, 1880 – June 21, 1954) was a Swedish-American electrical engineer. Gideon Sundback is most commonly associated with his work in the development of the zipper.

Otto Fredrik Gideon Sundback was born on Sonarp farm in Ödestugu Parish, in Jönköping County, Småland, Sweden. He was the son of Jonas Otto Magnusson Sundbäck, a prosperous farmer, and his wife Kristina Karolina Klasdotter. After his studies in Sweden, Sundback moved to Germany, where he studied at the polytechnic school in Bingen am Rhein. In 1903, Sundback took his engineer exam. In 1905, he emigrated to the United States.

In 1905, Gideon Sundback started to work at Westinghouse Electric and Manufacturing Company in Pittsburgh, Pennsylvania. In 1906, Sundback was hired to work for the Universal Fastener Company of Hoboken, New Jersey. Subsequently in 1909, Sundback was promoted to the position of head designer at Universal Fastener.

Sundback made several advances in the development of the zipper between 1906 and 1914, while working for companies that later evolved into Talon, Inc. He built upon the previous work of other engineers such as Elias Howe, Max Wolff, and Whitcomb Judson.