Distance between Cologne, Germany and Rockford, Illinois, USA
6875 km = 4272 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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Cologne, Germany
Country: GermanyCologne’s coordinates: 50°55′59″ N, 6°57′00″ E
Population: 963,395
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Rockford, USA
Country: USAState: Illinois
Rockford’s coordinates: 42°16′16″ N, 89°05′38″ W
Population: 152,871
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Wikipedia article: Rockford
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