Östergötland County
Östergötland County 
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Location map of Östergötland County in Sweden  | |
Map of Östergötland County  | |
| Coordinates: 58°24′38″N 15°36′49″E / 58.4106°N 15.6136°E | |
| Country | Sweden | 
| Founded | 1634 | 
| Capital | Linköping | 
| Municipalities | |
| Government | |
| • Governor | Carl Fredrik Graf (Moderate Party) | 
| • Council | Region Östergötland | 
| Area | |
 • Total  | 10,602 km2 (4,093 sq mi) | 
| Population  (31 December 2023)  | |
 • Total  | 472,298 | 
| • Density | 45/km2 (120/sq mi) | 
| GDP | |
| • Total | SEK 167 billion €17.800 billion (2015)  | 
| Time zone | UTC+1 (CET) | 
| • Summer (DST) | UTC+2 (CEST) | 
| ISO 3166 code | SE-E | 
| NUTS Region | SE123 | 
| Website | www | 
Östergötland County (Swedish: Östergötlands län) is a county or län in southeastern Sweden. It has land borders with the counties of Kalmar to the southeast, Jönköping to the southwest, Örebro to the northwest, and Södermanland to the northeast. It also has a sea border with Västra Götaland to the west (across lake Vättern), and borders the Baltic Sea to the east.
Östergötland County has a population of 456,550 (September 30, 2017) and the capital and biggest city is Linköping. Linköping and neighbouring twin city Norrköping together form one of Sweden's metropolitan areas; The Linköping-Norrköping Corridor is therefore sometimes marketed as The Fourth Metropolitan Region of Sweden, the other three being Stockholm, Gothenburg and Malmö. Princess Estelle is Duchess of Östergötland.