Partnercities
Sillamäe has friendly communications with following municipal units abroad:
- Nokia (Finland)
- Kotka (Finland)
- Havre de Grace, state of Maryland (USA)
- Brovarõ (Ukraine)
- Bütsow (Germany)
- Mstislavl (Belarus)
- Nekrasovi municipal district Yaroslavl areas (Russia)
- Kingisepp (Russia)
Cooperation agreements made with
- Nokia (Finland)
- Brovarõ
- Mstislavl (Belarus)
- Nekrassovi municipal district of the Yaroslavl area.
The friendship treaty is made with Havre de Grace (USA).
Sillamäe is a member of Union of Baltic Cities since 1998.
From cities of Estonia the closest cooperation is with the town of Kärdla, treaty about cooperation is signed.