The population density was 1.9 persons per square mile in 1997, making Madison County a frontier county. Virginia City was the second territorial capital.
Quake Lake is located in Madison County.
The county's largest employer is local government. The county is served by a part-time county health nurse. Life Support 911 Adv. None N.A. Prepared and distributed by the Community Health Development Section, Health Systems Bureau, Health Policy and Services Division.