County is: 2,274 sq mi
Population: ~60,000 (number will double, if not more, on weekends and holidays because we are a tourist county)
density: ~25/sq mi (not really true as ~60% of the county is uninhabited forests, wilderness, and National Park)
Just to show you that most of the county is Wilderness, Yosemite, and Forest (a SAR dream), the peach area to the left is the only really inhabited portion of the county, and the red dots and the stars are the only population centers (thee biggest of which has a population of 5000 at night):
Ambulance Service covers it all (with the exception of the 1/4 covered by Yosemite National Park) with 4 24/7 Medic/EMT Ambulances and 1 12/7 Medic/EMT Ambulance. This includes all IFTs, a good portion of which are out of county, meaning a 2-6 hour transfer time. Additional ambos can be staffed if needed to a maximum of 12 units in county, including 2 4WD riggs.
SAR (me) covers it all with (with the exception of the 1/4 covered by Yosemite National Park) 4 dedicated SAR units copable of seating 18 uncomfortably (our team is composed of anywhere from 25 to 55 people), a swiftwater trailer, a dive trailer, a snowmobile trailer (with 4 snomobiles), an ATV trailer (with 4 quads), and several horse trailers with horses (numbers depend on teh whose on the team). We also have access to other Sheriff's offce equipment (boats, more snowmobiles, more vehciles) and other resources from tothe agencies (helos, more horses, etc...)
Fire (some of whom also do EMS BLS First Response) is a seperate issue, as we are a wildland fire nighmare. We have 9 Fire Paid/Vollie Districts/Departmetns, the County Vollies (with 15 Stations), the USFS firefighters with their engines and utilities, and the state (CALFIRE) with their engines and utilities, not to mention the national park.