In 1872, Mr. Kimball was elected mayor of Concord, and was re-elected to this honorable and responsible office in 1873, 1874, and 1875. Immediately after Mr. Kimball assumed the duties of this office a severe freshet either carried away or rendered impassable five of the seven bridges spanning the Merrimack and Contoocook rivers. The work of rebuilding these structures devolved immediately upon him, as superintendent of roads and bridges. The Federal bridge and the bridge at Fisherville, both of iron, are monuments of his progressive ideas. During his administration the system of water supply from Long pond was carried on to successful completion, and the purest of water has since been at the command of every citizen. This work required a large sum of money, which was so carefully expended that no one has felt the burden save as a blessing. The fire department was invested with new dignity by the city government during those years. The firemen had their demands for appropriate buildings fully satisfied, and are proud, as is the whole city, of the beautiful central fire station and other buildings of the department, which compare favorably with any in the country. Aside from his mechanical skill, Mr. Kimball long since won the enviable reputation of an able and successful financier. In 1870, upon the organization of the Merrimack County Savings Bank, he was elected its treasurer, and has held the office ever since. To him, for many years, have been intrusted the settlement of estates, the management of trust funds, and the care of the property of widows and orphans. As treasurer of the New Hampshire Bible Society and Orphans' Home, he has given to those institutions the benefit of his financial experience. For the benefit of the city of Concord, the mechanical skill and financial ability of Mr. Kimball were fully exercised. During his term of office as mayor he was one of the water commissioners, _ex officio_, and president of the board in 1875. He was subsequently appointed a water commissioner, in 1877, for a term of three years; re-appointed in 1880, and has been president of the board since his first appointment. Upon the death of Hon. Nathaniel White, Mr. Kimball was elected president of the Concord Gas-Light Company, having held the office of director for several years. What little credit is due a member of the constitutional convention of 1876 is his. He represented the fifth ward in Concord, and served the convention acceptably as chairman of its finance committee.