Avilla fended off and avoided destruction during the Civil War, and was an overnight boom town during the Reconstruction Era at war's end. Merchandise and construction materials were hauled by wagon train from Sedalia, Missouri, the closest railroad shipping point to Avilla. Much of Jasper County lay in ruins, and local merchants and businessmen grew wealthy during the rebuilding of Carthage, Sarcoxie, and other nearby war-damaged communities. Many old time residents later claimed that Avilla had actually been the largest operating town in Jasper County after hostilities ended, for a short time. Commerce even came from as far away as Kansas, by farmers traveling to Avilla to buy seed, building supplies and provisions. Captain Thomas Jefferson Stemmons, a Union commander and son of the late Dr. J.M. Stemmons, returned home to Avilla and started a mercantile with partner D. B. Rives, which was the first new business established after the Civil War. The first hotel was called The Avilla House and was erected two years later in 1868 by Justice Hall. Through the 1870s and 1880s there were two general stores (dry goods & clothing), two grocery stores, one or more doctor's offices, one "notion" (sewing) store, two boot & shoe stores, one livery & feed stable, three churches, a drug store, a Grand Army of the Republic post (GAR) and two "secret societies": the Freemasons Lodge and the Independent Order of Odd Fellows Lodge (IOOF) and houses sprang up everywhere. Located at what is now named "School Street", the first Avilla school in town was built in the 1880s and taught grades 1–12 (called lower, upper and high school). Sources disagree, but some documents cite the town's population at over five hundred during these years, not including families on the farms encircling just beyond the town limits. Despite the initial spurt after the Civil War, growth of the town was stunted because the railroad was not built through Avilla. Farmland was the primary natural resource and without industry the population never increased after this time, and regular stage lines were eventually discontinued.