G
- Galesburg, Illinois – George Washington Gale
- Gallatin, Tennessee and other Gallatins – Albert Gallatin
- Galveston, Texas – Bernardo de Gálvez y Madrid, Count of Gálvez
- Garberville, California – Jacob C. Garber (first postmaster)
- Garcia, California – Rafael Garcia (land grantee)
- Gardiner, Maine – Dr. Sylvester Gardiner (Boston physician)
- Gardiner, New York – Lieutenant Governor Addison Gardiner
- Gardner, Massachusetts – Colonel Thomas Gardner (killed during the Battle of Bunker Hill)
- Garibaldi, Oregon – Giuseppe Garibaldi
- Garland, Maine – Joseph Garland (settler)
- Garland, Texas – Attorney General Augustus Hill Garland
- Garlock, California – Eugene Garlock (early businessman)
- Garretson, South Dakota – A.S. Garretson (banker)
- Gary, Indiana – Elbert Henry Gary
- Gasquet, California – Horace Gasquet (first postmaster)
- Geddes, New York – James Geddes (early settler)
- Gelatt, California – Ethel Gelatt (first postmaster)
- George, Washington – George Washington
- George West, Texas – George Washington West (founder)
- Georgetown, California – George Phipps (founder)
- Georgetown, Kentucky and Georgetown, Massachusetts – George Washington
- Georgetown, Washington, D.C. – George II of Great Britain
- Georgia (U.S. state) – King George II of Great Britain
- Gerry, New York – Elbridge Gerry
- Gertrude, California – Gertrude Haley (first postmaster)
- Gest, California – Erasmus Gest (railroad official)
- Gettysburg, Pennsylvania – Samuel Gettys (settler)
- Gilbert, Arizona – William "Bobby" Gilbert
- Gilchrist County, Florida – Albert W. Gilchrist Governor of Florida from 1909 to 1913.
- Gill, Massachusetts – Moses Gill (lieutenant governor of Massachusetts)
- Gillette, Wyoming – Weston Gillette (surveyor and civil engineer)
- Gilsum, New Hampshire – Samuel Gilbert and his son-in-law, Thomas Sumner (proprietors)
- Glen Burnie, Maryland – Elias Glenn (district attorney) and his descendants
- Glennville, California – James M. Glenn (blacksmith)
- Glocester, Rhode Island – Henry Stuart, Duke of Gloucester (note spelling)
- Glover, Vermont – Brigadier General John Glover (proprietor)
- Goecken, California – Herman Bernard Goecken (local rancher)
- Goffstown, New Hampshire – Colonel John Goffe (settler) (note spelling)
- Gorham, Maine and Gorham, New Hampshire – Captain John Gorham
- Gosford, California – Earl of Gosford
- Gosnold, Massachusetts – Bartholomew Gosnold
- Gouldsboro, Maine – Robert Gould (landholder)
- Grafton, Massachusetts – Charles FitzRoy, 2nd Duke of Grafton
- Grafton, New Hampshire – Augustus FitzRoy, 3rd Duke of Grafton (relative of colonial governor Benning Wentworth)
- Granby, Massachusetts – John Manners, Marquess of Granby (hero of the Seven Years War)
- Granby, Vermont – Marquis of Granby
- Granger, Washington – Walter Granger (superintendent of the Washington Irrigation Company)
- Grantham, New Hampshire – Thomas Robinson, 1st Baron Grantham
- Gray, Maine – Thomas Gray (proprietor)
- Greeley, Colorado – Horace Greeley (editor of the New York Tribune)
- Greenwich, California – Peter D. Greene (founder)
- Greensboro, North Carolina – Nathanael Greene
- Greensboro, Vermont – Timothy Green (landowner)
- Greenville, Alameda County, California – John Green (early merchant)
- Greenwood, El Dorado County, California – John Greenwood (early settler)
- Grestley, California – James Grestley
- Gridley, California – George W. Gridley (founder)
- Griswold, Connecticut – Governor Roger Griswold
- Guernsey, California – James Guernsey (landowner)
- Guilford, Maine – Moses Guilford Law (first white child born here)
- Guilford, Vermont – Francis North, 1st Earl of Guilford
- Gurnee, Illinois – Walter S. Gurnee (mayor of Chicago)
- Gustine, California – Augusta Miller, daughter of Henry Miller (rancher)
Read more about this topic: List Of American Places Named After People