Marathon, FL, United States

With a population of just 9,689, Marathon is a sleepy Florida Keys town that offers little in the way of big-city amenities. The median household income is a modest $36,010, and nearly 15% of the population lives below the poverty line. While the lush tropical climate provides ample opportunities for outdoor recreation, the relentless hurricane season is a persistent headache. And with Marathon's remote location, bureaucratic hurdles abound for residents seeking basic services. This laid-back enclave is best suited for retirees and diehards who can overlook its limitations.