I am working on Schuylkill County Pennsylvania now. Over 100 stations in the county. Multi "Good Intent", "Humane", "American" etc fire companies.
ecps92 could you give a URL for the source(s) that you are mentioning?
Notes
1. On the Zerg90 maps, if you click on a map marker, and then click on "View in Google Maps", and then click on the fire station picture on the left, you will go to a zoomable and pannable view of the fire station. Google Maps has many rural areas without Street View. Signs on fire stations cannot be read in 2008 Street Views. After that, its better. Apparently Google got better cameras for their cars after 2008.
2. Google Maps is sometimes far off on their station locations and street addresses (up to a mile or more in rural areas); they commonly intentionally alter street addresses for fire stations; and they dont show many stations. You can search their maps for "fire station" to find listings.
3. Home Town Locator has good lats and longs on many stations. I think they use a federal GIS source with info from 2011. They do not have all stations, and they commonly switch "Sta 1" with "Sta 2" for individual fire departments.
4. firedepartments.net has good info about the number of stations per department. Their listings are nominally by county. But actually the listings are by zip code.
5. The US Fire Administration has a FD Registry but the info is sparse.
6. County GIS sites and Assesors info can help to find well hidden fire stations.
7. Nearly every fire station has a sign on it listing the FD name and the station number or name. Google Street View shows the number of bays, the number of floors, sometime the rigs, any radio antennas and sirens, etc.
8. Both the FCC and Census Bureau have apps that will tell you the county associated with lats/longs. However Locust Dale PA and 1 FD in Sullivan/Ulster County NY are giving me problems now. Cant quite figure out which county they are really in. Wikipedia will also tell you which county a location is in. But it is sometime wrong.
9. WikiMaps and OpenFireMap show fire stations. This is crowd sourced info on a international scale. Coverage is maybe 20% now.
10. Vermont 911 has extensive info online. iirc they show every street address in the state plus every water source.