I got a question for you: Costco's worldwide headquarters are in Issaquah, Washington, but the company opened its first warehouse in nearby Seattle in 1983. Through mergers, Costco's corporate history dates back to 1976, when its former competitor Price Club was founded in San Diego, California. As of March 7, 2018, Costco had a total of 749 warehouses; In the United States (519), Canada (98), Mexico (38), United Kingdom (28), Japan (26), South Korea (14), Taiwan (13), Australia (9), Spain (2), Iceland (1) and France (1).

Answer this question: how many costco's are there in the united states?
Let's think first:
This is the relevant information: As of March 7, 2018, Costco had a total of 749 warehouses; In the United States (519), Canada (98), Mexico (38), United Kingdom (28), Japan (26), South Korea (14), Taiwan (13), Australia (9), Spain (2), Iceland (1) and France (1).
Therefore, the answer is 519.