I do work in many, many small hospitals around VT, NH, and northern NY, and I can actually only think of two.
One isn’t a real ER/ED, just a beefed-up walk-in clinic/urgent care center, and it’s in a satellite hospital of the larger medical center a few miles away. I think it closes at 9 or 10 PM. But it does differ from most walk-in clinics and urgent care centers in that it is a real hospital, too. It has an in-patient unit, an OR, a radiology department, a lab, etc…
The other one is in the smallest hospital I have ever seen. It’s in Star Lake, NY, which is a town less than 1,000 people. It’s ER is also the only literal emergency room I have ever seen.
One room, with two beds and a curtain between them. It is pretty much only open/staffed during first and second shift. It can’t do any real serious trauma, either. If you have a heart attack they have the ability to monitor you, they have a defib, but as soon as your stable you’re getting transported somewhere better…it’s almost equidistant from either Canton-Potsdam hospital in Potsdam, or Adirondack Medical Center in Saranac Lake. There’s a good chance they’ll just send you to one of those two in the first place if they think it’s serious.
It’s fine for getting sutures, setting a broken bone, etc…but not much else. The in-patient ward is only 15 beds or so, no ICU, no bedside monitors, just rolling stand BP/pulse ox machines and three telemetry units. No OR, two DI rooms, one with a standard X-ray, the other with a CT.
I honestly have no idea how it stays in business. Heck, last time i was there they were starting a new addition!