Helsinki, the capital city of Finland, is home to a growing cryptocurrency community with several virtual currency exchanges operating in the city. Some of the largest virtual currency exchanges in Helsinki include:

1. LocalBitcoins - LocalBitcoins is a peer-to-peer cryptocurrency exchange based in Helsinki. It is one of the oldest and most well-known cryptocurrency exchanges in the world, allowing users to buy and sell bitcoin directly with each other using a variety of payment methods.

2. Coinmotion - Coinmotion is another popular cryptocurrency exchange based in Helsinki. It offers a user-friendly platform for buying, selling, and storing a variety of cryptocurrencies, including bitcoin, ethereum, and litecoin.

3. Bittiraha - Bittiraha is a Finnish cryptocurrency exchange that offers a range of services, including buying and selling bitcoin and other cryptocurrencies, as well as providing a secure wallet for storing digital assets.

4. Prasos - Prasos is a Helsinki-based cryptocurrency exchange that operates several platforms, including Coinmotion and Bittiraha. It offers a range of services for buying, selling, and storing cryptocurrencies, as well as providing educational resources for those new to the world of digital assets.

5. Coinmotion - Coinmotion is a Helsinki-based cryptocurrency exchange that offers a user-friendly platform for buying, selling, and storing a variety of cryptocurrencies. It also provides educational resources for those new to the world of digital assets.

Overall, Helsinki has a vibrant cryptocurrency community with several virtual currency exchanges operating in the city. These exchanges provide a range of services for buying, selling, and storing cryptocurrencies, making it easy for residents of Helsinki to participate in the growing digital asset market.