Short answers, pulled from the story.
Irwinville emerged as the seat for newly formed Irwin County in 1831. The community originally bore the name Irwinsville to honor Georgia governor Jared Irwin before dropping the final S upon incorporation in 1857.
Confederate President Jefferson Davis got captured by Union troops from the First Wisconsin and Fourth Michigan Cavalry Regiments on the 9th of May 1865 near a creek bed. A monument now marks this location within the Jefferson Davis Memorial Historic Site where he had stopped at a hotel owned by Doctor G.E. White.
Southern Unionists were led by miller Willis Jackson Bone who assembled in Irwinville in mid-February 1865. Bone declared the county's return to the Union after passing a resolution and later faced execution following his confrontation with justice of the peace Jack Walker.
Three courthouses stood in Irwinville between 1831 and 1907 before the county seat moved to Ocilla in August 1907. Benjamin Baker built the first courthouse for about $1,500 while Loam Brown constructed a second one in 1854 costing $1,323.
The Ocilla & Irwinville Railroad operated eleven miles of track from October 1900 until track abandonment occurred in 1916. The line was purchased by the Brunswick & Birmingham Railroad around March 1903 and owned one locomotive plus forty-six freight carriages during its operation.