have a copy of a couple of books on place names in Georgia. I am in the
process of trying to compile a list for the GAGenWeb page. Here is a list
of the Forts and their counties and date built or established if known (the
ones in the 1830s were indian stockades built to hold Cherokee and others
before they were resettled west):

Fort Advance		Baldwin 	1794
Fort Alert		Charlton
Fort Argyle		Bryan		1733
Fort Augusta		Richmond	1736
Fort Barrington		McIntosh	1760 (later called Fort Howe)
Fort Bartow		Chatham
Fort Benning		Chattahoochee	1917
Fort Brown		Chatham		Civil war
Fort Buffington		Cherokee	
Fort Cedartown		Polk		1830s
Fort Chastain		Towns		1830s
Fort Cockspur		Chatham		by 1764
Fort Cornwallis		Richmond	erected by British
Fort Cummings		Walker		1836
Fort Dahlonega		Lumpkin		1830s
Fort Daniel		Gwinnett	1813
Fort Darien		McIntosh	aft 1736
Fort Dearborn		Clinch		1830s
Fort Defense		Wayne		Rev. War
Fort Defiance		Baldwin		by Elijah Clarke
Fort Deposit		Dawson		1818
Fort Early		Dooly/Crisp	1812
Fort Ebenezer		Effingham	1757
Fort Edwards		Oconee		1789
Fort Erwin		Washington	by Jared Irwin
Fort Fidius		Baldwin		1793
Fort Floyd		nr Okefenokee	1838
			Swamp
Fort Frederica		Glynn		1736
Fort Frogtown		White		1838
Fort Gaines		Clay		1814
Fort Galphin		Richmond?	erected by British
Fort George		Chatham		1761
Fort Gillem		Clayton		1974
Fort Gilmer		Clinch
Fort Gilmer		Fulton		orig. name for Fort Peachtree
Fort Gilmer		Gilmer		1836
Fort Gordon		Richmond
Fort Greene		Pulaski		destroyed 1804
Fort Grierson		Richmond	Rev. War
Fort Halifax		Chatham		1759
Fort Hawkins		Bibb		1806
Fort Heard		Wilkes		1774
Fort Heitzel		Gilmer		1830s
Fort Hill		Dougherty
Fort Howe		McIntosh	1777
Fort Hughes		Decatur		1700s
Fort Jackson		Chatham		1808 (on site of Mud Fort, built 1778)
Fort James		Elbert		c1776
Fort Jones		Stewart		c1837
Fort King George	McIntosh	1721
Fort Lamar		Madison
Fort Lawrence		Taylor		c1804
Fort Lawton		Jenkins		1864 (POW camp)
Fort McAllister		Bryan		1861
Fort McIntosh		Camden		1777
Fort McPherson		Fulton		1867
Fort McCreary		Stewart		bef 1836
Fort Massachusetts	Baldwin		1791
Fort Mathews		Clarke		1793
Fort Mitchell		Russell, AL	1813
Fort Montpelier		Baldwin		1794
Fort Morris		Liberty		1776
Fort Mountain		Murray		c1530 (Indian?)
Fort Mudge		Brantley
Fort Mudge		Pierce
Fort Nell		Greene
Fort Oglethorpe		Bibb		Civil War
Fort Oglethorpe		Catoosa		1902
Fort Peachtree		Fulton		1814
Fort Perry		Marion		1813
Fort Pickering		Charlton	c1812
Fort Pond		Pulaski		lake named for Fort Greene
Fort Prince William	Camden		1740
Fort Pulaski		Chatham		c1829
Fort Recovery		Decatur		1817
Fort Romulos		Monroe		sited, but never built
Fort St. Andrew		Camden		1736
Fort St. Simon		Glynn		1738
Fort Scott		Decatur		1816
Fort Screven		Chatham		1875
Fort Steward		Bryan, Evans, Liberty & Long
Fort Sunbury		Liberty		1776 (aka Fort Morris)
Fort Swamp		McIntosh	mid 1700s
Fort Tattnall		Clinch		1838
Fort Telfair		Long		1776 (also called Beards Bluff Fort)
Fort Tonyn		at Scrubby Bluff on St. Mary's River	Rev War
Fort Twiggs		Hancock		1793
Fort Tybee		Chatham		c1779
Fort Tyler		Troup		Civil War
Fort Uchee		Screven		bef 1742
Fort Valley		Peach/Houston
Fort Walker		Fulton		Civil War
Fort Walker		on Chepucky Island
Fort Washington		Wilkes
Fort Wayne		Chatham		1759 (orig Fort Savannah)
Fort Wilkinson		Baldwin		1797
Fort William		Camden		1740
Fort Wimberley		Chatham		1741
Fort Winston		Baldwin		1794
Fort Wormsloe		Chatham		1735
Fort Wrightsboro	McDuffie	Rev. War
Fort Yargo		Barrow		1790s