USA Trade Online also allows you to track imports and exports traveling through more than 40 custom districts in the United States and its territories using the Custom District Selection screen. A district is an area within the United States comprised of several ports in the same general location. For example, the Los Angeles district includes the ports of Los Angeles, Long Beach, Los Angeles International Airport, El Segundo, Las Vegas, etc. Importantly, a district is not specific to a state and ports from different states can be in the same district. Notice in the above example that Las Vegas, Nevada is included in the Los Angeles district. It is important to note that you cannot extrapolate state-level information under this dimension. In addition to the standard custom districts, you can also use this dimension to view data on low-value shipments and ships/vessels that leave/enter the United States under their own power, such as exported or imported cruise ships (select “Shipments Individually” and “Vessels Own Power,” respectively).