Gotland , Sweden (unofficial)

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57 000 inhabitants
Kragerö¸, Norway

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twin town of Valkeakoski since 1954
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11 000 inhabitants
Sokol, Russia

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twin town of Valkeakoski since 1971
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60 000 inhabitants
Vechelde, Germany

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twin town of Valkeakoski since 1976 (formerly Landkreis Braunschweig)
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16 360 inhabitants
Jelenia Góra, Poland

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twin town of Valkeakoski since 1979
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100 000 inhabitants
Nanchang, China

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twin town of Valkeakoski (and Toijala) since 1997
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4 000 000 inhabitants
Maarianhamina, Ahvenanmaa
- http://www.mariehamn.aland.fi/
- twin town of Valkeakoski since 1999
- 10 500 inhabitants
