Carcassonne city scoring
When the city is completed, the player(s)[1] with the most knights in the city gets points for the city in the amount of two per tile plus two per banner[2]. No other player receives any points for that city.
For example, when completing a three-tile city without banners, the player with two knights will receive 6 points, and the player with one knight will receive none, just like if there was only one knight in the city.


In the event of a tie, each of the players tied for the most knights gets all of the points.
Half that for incomplete cities at the end of the game.



A city is complete when it is surrounded by walls and there are no gaps in the walls or the city. There can be any number of sections in a city. A player who owns a knight in a completed city scores 2 points per tile in the city (count the tiles and not the sections). Each banner in the scored city also gives the player 2 points.
What if there are more than one follower on a completed road or city? With some clever tile placements, it is possible to connect road and city sections, resulting in a road with more than one thief or a city with more than one knight. The player with the most thieves or knights scores the totality of the points. In case of a tie, the tied players each score the points.
During the final scoring, incomplete roads, cities or monasteries are scored. A player who has a follower on an incomplete road, city or monastery scores 1 point per tile. For cities, each banner is also worth only 1 point. In case of a tie, use the same rules as for completed features.

(Emphasis in original)