A quick Google search for "satellite tracking" turns up websites that let you determine when and where you can see satellites. For example, spaceweather.com asks me for my zip code and then tells me that tomorrow at 4:49:53am I can look in a WSW direction at an elevation of 60 degrees and see the Lacrosse 5 satellite. Anyone who doubts this information can enter their own zip code on that site, get up in the early morning, look up, and verify that a starlike-light is travelling quickly across the sky just at the predicted time and place. And if you have a cheap telescope, you can easily see that it's not a planet or a star.
If you are a member of the "satellites don't exist crowd", how do you explain this?