 chatham county is a county located in the u.s. state of georgia. as of the 2010 census, the population was 265,128, making it the fifth-most populous county in georgia (and the most populous georgia county outside the atlanta metropolitan area). the u.s. census bureau's 2013 population estimate was 278,434 residents.http://factfinder2.census.gov/bkmk/table/1.0/en/pep/2013/pepannres/0400000/us13.05000 the county seat and largest city is savannah. one of the original counties of georgia, chatham county was created february 5, 1777, and is named after william pitt, 1st earl of chatham chatham county is included in the savannah metropolitan statistical area. ==geography== according to the u.s. census bureau, the county has a total area of , of which  is land and  (32.6%) is water. chatham county is the northernmost of georgia's coastal counties on the atlantic ocean. it is bounded on the northeast by the savannah river, and in the southwest bounded by the ogeechee river. ===major highways===  * 20px interstate 16 * 20px interstate 95 * 25px interstate 516 * 20px u.s. route 17 * 20px u.s. route 80 * 20px state route 17 * 20px state route 21 * 20px [[georgia state route 21 spur (garden city)|state route 21 spur]
1777_establishments_in_Georgia_(U.S._state) Chatham_County,_Georgia Georgia_(U.S._state)_counties Populated_places_established_in_1777 Savannah_metropolitan_area