It's highly likely this is callery pear, Pyrus calleryana, as already mentioned by others. Not exactly 'Bradford' because that is a clonally propagated cultivar. But they could be seedlings from 'Bradford'. Or they could be seedlings of seedlings of .... this has been going on for over 30 years. 'Bradford' was enormously popular.
It was supposed to be "sterile". It is only self-infertile. As other cultivars were developed and planted, they began to cross-pollinate. The eventual result is the millions if not billions of those seedlings which are invading many natural areas.
Many states have declared it an invasive species. That doesn't seem to be its current formal status there in Virginia:
One characteristic of these seedling pears that makes them stand out in fall is the very delayed development of fall color and leaf dehiscence. They are often the last trees still in leaf here, and mild freezes don't stop them. The fall colors can be beautiful. But so can the fall color of poison Ivy.
There's a field near me, several acres, that is on the verge of being a completely "impenetrable thicket" as noted on the flyer above. Birds land on the tallest weeds and drop seeds everywhere. The seedlings germinate too close together for long term survival but they grow anyway. There are often groves of them under power lines.
There is plenty of information available online about callery pear together with ID tips.