Kristiine Administrative district in Tallinn Tallinn, the largest city and capital of Estonia (population 440 000). (pop. 33,000). is one of the eight administrative districts of Tallinn Tallinn, the largest city and capital of Estonia (population 440 000). (population approx. 33,000). It is a quickly developing area of Tallinn Tallinn, the largest city and capital of Estonia (population 440 000). , where you can enjoy privacy without being too far from the city centre.