Here is a list of northernmost inhabited places by increasing population:
82º N: Alert, Canada – population 0-5. Northernmost inhabited place.
79º N: Ny-Ålesund, Svalbard, Norway – population 35. Northernmost year-round inhabited place.
78º N: Longyearbyen, Svalbard, Norway – population 2,075. Northernmost town of over a thousand.
71º N: Tiksi, Russia – population 5,063. Northernmost town of over five thousand.
70º N: Hammerfest, Norway – population 10,217. Northernmost town of over ten thousand.
69.7º N: Tromsø, Norway – population 71,295. Northernmost city/town of over fifty thousand.
69.3º N: Norilsk, Russia – population 175,000. Northernmost city of over a hundred thousand. Arguably the northernmost city.
68.9º N: Murmansk, Russia – population 307,000. Largest city north of the Arctic Circle.
60.6º N: Helsinki, Finland – population 600,000. Northernmost city over five hundred thousand.
60º N: St. Petersburg, Russia – population 4,900,000. Northernmost city over a million.
55º N: Moscow, Russia – population 12,000,000. Northernmost metropolis over ten million.