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![]() Collier County, Florida Collier County is a county located in the U.S. state of Florida. The U.S. Census Bureau 2016 estimate for the county is 350,202. Its county seat is Naples, Florida. History Collier County was created in 1923 from Lee County. It was named for Barron Collier, a New York City advertising mogul and real estate developer. ![]() |