The name "Misasa" (literally "three mornings") originates from the belief that one who stays to enjoy three mornings in the town's famous hot springs will find all of his ailments cured.
As of October 1, 2007, the town has an estimated population of 7,322 and a density of 31.4 persons per km². The total area is 233.46 km².
Misasa is for the most part a spa resort, boasting springs of radium-rich water, exhausting radon, a radioactive gas. It is believed that bathing one in such waters can actually be good for one's health, although there is not a scientific consensus on whether doing so is actually detrimental or helpful to one's health (see Radiation hormesis). For this reason, the town of Misasa organizes a yearly Marie Curie festival – Marie Curie discovered radium.