Distance between Lisbon, Portugal and Decatur, Illinois, USA
6631 km = 4120 miles
We assume a spherical Earth as a close approximation of the true shape of the Earth (an oblate spheroid). The distance is calculated as great-circle or orthodromic distance between city centres on the surface of a sphere.
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Lisbon, Portugal
Country: PortugalLisbon’s coordinates: 38°43′00″ N, 9°07′59″ W
Population: 517,802
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Wikipedia article: Lisbon
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Decatur, USA
Country: USAState: Illinois
Decatur’s coordinates: 39°50′25″ N, 88°57′17″ W
Population: 76,122
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Wikipedia article: Decatur
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