Hattiesburg is a city in Forrest County in Mississippi, a state of the United States of America. It is the principal city of the Hattiesburg, Mississippi Metropolitan Statistical Area which encompasses Forrest, Lamar and Perry counties. The MSA population exceeded 150,000 as a result of a 10% increase following Hurricane Katrina in August of 2005. It is Mississippi's fourth largest city and is known as 'The Hub City'. It has an incorporated suburb, Petal, and a presently unincorporated area, Oak Grove. It is the county seat of Forrest County, but the city has grown in recent years to include a portion of eastern Lamar County. Hattiesburg is home to the University of Southern Mississippi and William Carey University. Just south of Hattiesburg is Camp Shelby, the largest National Guard training base east of the Mississippi River. Hattiesburg apartments for rent comparison page shows most up to date rent information on Hattiesburg apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.