Viljandi has officially 10 twin cities:

Porvoo, Finland (since 1961)– www.porvoo.fi; www.visitporvoo.fi

Ahrensburg, Germany (since 1989)- www.ahrensburg.de

Härnösand, Sweden (since 1990)– www.harnosand.se

Valmiera, Latvia (since 1992)– www.valmierasnovads.lv; www.visit.valmiera.lv/en

Eslöv, Sweden (since 1997)– www.eslov.se

Frostburg, USA (since 2000)– www.frostburgcity.org (relations have stalled)

Ternopil, Ukraine (since 2004)– www.ternopilcity.gov.ua/en; www.ukrainetrek.com/ternopil-city

Kretinga, Lithuania (since 2008)–  www.kretinga.lt; www.visitkretinga.lt

Cumberland, USA (since 2013)– www.ci.cumberland.md.us (relations have stalled)

Telavi, Georgia (since 2017)– www.telavi.gov.ge