Largo is the third largest city in Pinellas County, Florida, United States, and is part of the Tampa Bay Area. As of the 2014 Census estimate, the city had a population of 84,500, up from 69,371 in 2000.Largo was first incorporated in 1905. In 1913, it became the first municipality in Pinellas County to adopt a council-manager government. It switched back and forth from "town" to "city" a few times, and became a city again in 1974. It was an exporter of agricultural products until the 1960s when the influx of people began to transform it into a bedroom community. From 1905 to 2010, Largo grew in area from 9/16ths of a square mile to about 19 square miles, and in population from about 300 people to more than 70,000. Largo began as a rural farming community and became the third largest city in Florida's most densely populated county.Largo is a sister city to Tosayamada, Kochi, Japan.