Convenient coaches from both the Tallinn and Tartu coach stations travel to Ida-Viru County. Most coaches departing from Tallinn and Tartu to Ida-Viru County stop in major towns Jõhvi, Sillamäe and Narva. Tallinn coaches also stop in Kohtla-Järve. You can find bus routes here.
Particularly comfortable Lux Express coaches operate the route Tallinn - Ida-Viru County - St. Petersburg. Pre-book your tickets as early as possible on the Lux Express website here.
Bus lines within the county reach almost all major attractions, for example, Kuremäe, Toila, Mäetaguse, Sillamäe, etc. You will find the numbers and times of the county buses here.