In 1858 the farm in Epsom was sold, and, his father having removed to Concord, Mr. Carpenter, in April of that year, established his residence in the town of Pittsfield, having been tendered and accepted the cashiership of the Pittsfield bank. He discharged the duties of that position so satisfactorily that upon its conversion to a national bank, in 1864, he was continued as cashier and also made a member of the board of directors. He continued his residence in Pittsfield until the spring of 1877, remaining all the while in management of the bank's affairs, while at the same time engaging in various lines of business in his own behalf. Nor did he fail to devote attention to public affairs. Never a politician, but always a stanch Democrat, he took no little interest in the success of his party, as well as the welfare of the town and community. He was frequently intrusted with official responsibilities by his fellow-citizens of Pittsfield, and represented them in the legislature in 1862 and 1863. In the fall of 1863, his health having become impaired from overwork, he went South to spend the winter, upon the advice of his physicians, going first to New Orleans, whence he made a trip up the river, where he had a fine opportunity for viewing the operations of the army in that quarter, the time being soon after Gen. Butler's occupancy of the city. Later in the season he visited Cuba, where he remained some time, returning in the spring greatly invigorated, and with improved general health. He was elected treasurer of Merrimack county in 1872, and again the following year, receiving at each election a support considerably in excess of his party vote. Long prominent in the councils of his party in his section of the state, he has served also, at different times, as a member of the Democratic state committee.