The oldest partnership was inherited from the previous district Hanau, and was formed in 1972 with the Croatian municipality of Kutina - however it took till the 20th anniversary in 1992 that this partnership was officially signed.
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A friendship was signed in 1997 with the Russian city Troitsk, together with the partnership of the city Wächtersbach with Troitsk.
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In 1986 the district parliament decided to start a developing project with the Diriamba region in Nicaragua.
Theodore Levitt (March 1, 1925, Vollmerz, Main-Kinzig-Kreis, Germany – June 28, 2006, Belmont, Massachusetts) was an American economist and professor at Harvard Business School.
The Hessian Ludwig Railway (Hessische Ludwigs-Eisenbahn-Gesellschaft, HLB), which was established in the Grand Duchy of Hesse recognized the importance of the HLB for the expansion of railway services in the Rhine-Main region, particularly to the province of Upper Hesse (an exclave of the Grand Duchy), from the Rhine-Main area to Bavaria and via the Kinzig valley to Bebra.
The northern route through the Gap passes south of the Knüllgebirge and then continues around the northern flank of the Vogelsberg Mountains; the narrower southern route passes through the Fliede and Kinzig Valleys, with the Vogelsberg to the north and the Rhön mountains and Spessart mountains to the south.
The entire route of the Lahn-Kinzig Railway to Gelnhausen, that comprised a link line of 70 km length along the western perimeter of the Vogelsberg to the Kinzig Valley Railway, was completed on 30 November 1870.