U.S. flag

美国政府的官方网站

Dot gov

Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS

A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites..

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Population

The number of individuals residing in a geographic area. The population figure is based on the most recent official census and only includes those individuals who permanently reside within the jurisdiction served. Population figures do not include daily or seasonal population surges.