Madison is a city in and the county seat of Jefferson County, Indiana, United States, along the Ohio River. Its estimated population was 12,083 as of 2012. Madison is one of the primary cultural, economic, and population centers in an area with a population of 1,478,637. Madison sits in another larger urban area known as the Indiana golden triangle with a population of around 4,500,000. In 2006, the majority of Madison's downtown area was designated the largest contiguous National Historic Landmark in the United States—133 blocks of the downtown area is known as the Madison Historic Landmark District. On August 25, 2006, a blaze severely damaged two historic downtown buildings, the Madison Elks Lodge and a former city hall building that was occupied by an insurance company.