Byron Joslin participated in the prosperous times that followed the end of the war. With brother Clay and his father, Robinson, Byron opened a sash and door factory on North Main Avenue. The Joslins later entered the construction business, and subsequent to that operated a grocery for 7 years. He married Elizabeth Deering on June 6, 1871. They had two children, William and Ada. William Jasper received a pension after the war due to a disability. He married twice before he met Alberta in 1927. Their friendship began when they talked across the fence in his front yard. As author Rhetta Grimsley Johnson concluded, "Her alliance with the Rebel veteran was honorable, if unromantic. That union, which amazingly produced a son,...was one of mutual need and respect." She cared lovingly for William until his death in 1932.

As the years passed on, and his Shelby County Civil War comrades passed away, Comrade Joslin became increasingly active in veterans' affairs. At various times until his death, Joslin was a state and national representative to the Grand Army of the Republic encampments. He served as the aide-de-camp, assistant adjutant, and quartermaster general, and then commander of the Ohio G.A.R. He was one of the few remaining veterans to attend the 75th anniversary of the battle of Gettysburg in 1938.

Granddaughter Vera Killian of Sidney, one of Byron's two grandchildren who survive, has fond memories of him. He would travel into Sidney on the streetcar from where he lived with his son on Millcreek Road to visit with family and friends. On Christmas Day, Grandfather Joslin appeared with a silver dollar for each grandchild.

His interests included making wooden puzzles, collecting old books, and keeping scrapbooks of news on Civil War reunions and local events. The scrapbooks, comprised of hundreds of pages, offer a fascinating insight into early Sidney through the eyes of one of its most loyal and patriotic citizens. It was as the unquestioned symbol of patriotism in Shelby County, however, that Byron Joslin was best known. For over seven decades he participated in Memorial Day parades, always in his full dress uniform. Vera Killian recalls that he required family members to attend such important civic events. In his Sidney Daily News obituary, the author noted:  "Few men have walked more steadfastly under the waving flag of his country that Comrade Joslin, and none here more endeared himself to the adult or youth than this aged man who took part in every patriotic undertaking possible."