Lamar is located in Barton County. About 4,266 people live here (as of 2020). Between 2010 and 2020, the population declined from 4,532 to 4,266. The region is at 293 meters above sea level. The area covers about 14.1 square kilometers. There are about 208 streets in Lamar. The region was founded in 1852. The postal codes are 64759. The dialing code is 417. Lamar is city in and county seat of Barton County, Missouri, United States. Among other things, Lamar has restaurants and schools. More information at
www.cityoflamar.org.