"What it does: Provides visiting nurses, aides, and rehab therapists to Medicare and Medicaid patients in six southern states. Why it's growing: LHC operates only in rural areas with fewer than 100,000 people living in a 25-mile radius, so it's usually the only game in town. Humble beginnings: CEO Keith Myers started LHC with his wife, a nurse, in Palmetto, La. — a town with just 186 residents. In June, the company went public; it now trades on the Nasdaq Stock Market."