Bryantsburg is an unincorporated community in Monroe Township, Jefferson County, Indiana. Bryantsburg was platted on March 5, 183…Bryantsburg is an unincorporated community in Monroe Township, Jefferson County, Indiana. Bryantsburg was platted on March 5, 1834, by Jacob Bryant with 32 lots. Thomas Bell platted an 11-lot addition on March 25, 1851; Robert Kinnear, an addition of eight lots on June 27–28, 1853. Bryantsburg had a post office from June 10, 1834, to December 12, 1856; Jan. 18, 1858, through Dec. 10, 1872, and finally from March 1, 1873, through June 29, 1907.