Houses on the northern side of Main Street east of the Clay Street intersection in Gettysburg, Ohio, United States. – Nyttend, Public domain – Wikimedia Commons Gettysburg is located in Darke County. About 463 people live here (as of 2020). Between 2010 and 2020, the population declined from 513 to 463. The region is at 302 meters above sea level. The area covers about 1.1 square kilometers. There are about 26 streets in Gettysburg. The postal codes are 45328. Gettysburg is village in Darke County, Ohio, United States of America.