I was using software called DSC Decoder to decode the DGPS signals. The decoded signal is mostly positioning information, but each line transmitted begins with a station identifier number. I found a guide on the web, the World DGPS Database, that lists all the DGPS stations worldwide. Using this guide you can look up the stations you receive by frequency and identifier to find out where they're located.
Here are the DGPS stations I received today. I'll refer to them with IDs like DGPS-123 (meaning the station's transmitted identifier is 123):
- DGPS-118, 322 kHz, 0515-0522 UTC, good signal. Location: Youngstown, NY, USA.
- DGPS-116, 319 kHz, 0547-0548 UTC, fair signal. Detroit, MI, USA.
- DGPS-184, 291 kHz, 0551-0554 UTC, fair-poor signal, Hawk Run, PA, USA.
- DGPS-136, 297 kHz, 0600-0602 UTC, poor signal. Location: Bobo, MS, USA.