The United States is home of some of the largest public transportation systems in the world. You can find several options for transportation such as subways, busses, light rails, and ferry’s in these major cities. These public transportation system transports millions of commuters daily in your county, click here to find out your county. In the US, there are five major cities that have the largest public transportation system; Chicago, New York City, Boston, Washington DC, and San Francisco. Since 1904, the US has been providing public transportation to commuters and residents of all kind making the daily commute a little less stressful!