Darien is a city in McIntosh County, Georgia, United States. It lies on Georgia's coast at the mouth of the Altamaha River, approximately 50 miles south of Savannah, and is part of the Brunswick, Georgia Metropolitan Statistical Area. The population of Darien was 1,975 at the 2010 census. The city is the county seat of McIntosh County. It is the second oldest planned city in Georgia and was originally called New Inverness.