Downtown Orlando is the historic core and central business district of Orlando, Florida, United States. It is bordered by Marks Street in the north, Mills Avenue (SR 15) in the east, Orange Blossom Trail (US 441) in the west, and Kaley Avenue in the south. There are five enclaves in downtown; "Uptown" in the north around Lake Ivanhoe, "Lake Eola Heights" and "Thornton Park" in the east around Lake Eola, "Parramore" in the west, and the "Central Business District" (or the "Financial District") between Colonial Dr and Lake Lucerne in the center. In 2010, the estimated population of downtown was 44,300. The daytime population was estimated to be 65,000. of that year.