In the summer of 1865 he removed to Nashua, for the purpose of continuing the practice of his profession. An accidental purchase led to a change of occupation. The _Nashua Telegraph_ had for many years been edited by Albin Beard, a genial, witty, and, withal, accomplished writer. Under him, the _Telegraph_ had acquired a marked local popularity. He died in September, 1862. Its present publishers were inexperienced writers, and illy qualified to satisfy the admirers of its former editor. The _Telegraph_ was rapidly deteriorating in value and influence. The senior proprietor inquired of Mr. Dearborn what he would give for his half of the establishment. A somewhat nominal price was offered, and much to the surprise of Mr. Dearborn was accepted. He at once entered upon the duties of editor and financial manager. Under his direction the _Telegraph_ was rapidly recovering its patronage and influence, but at the end of two years his health failed, and a change of occupation became a necessity. He disposed of his interest to the present editor, Hon. O. C. Moore, and resumed the practice of law. Since his residence at Nashua. Mr. Dearborn has contributed largely to the improvement of real estate, to the erection, of improved school-buildings, and in his capacity as member of the board of education to the reconstruction and greater efficiency of the public schools. He was appointed register of probate for Hillsborough county in 1868, and held the office till 1874. For several years he was treasurer of the Nashua & Lowell Railroad, and is still one of the directors. In his official action he aided largely in sustaining the measures which have placed that corporation in front rank of profitable railways. Nearly twenty years ago, while a resident of Peterborough, he was appointed, by the governor, one of the Bank Commissioners of New Hampshire. In that capacity he became acquainted with the extent and peculiarities of the financial institutions of the state. In 1864 and 1865, he actively superintended, in his official capacity, the converting of the state banks of discount into the national banks of the present system. In March, 1866, he was appointed Examiner of the National Banks for the state of New Hampshire, a position which he still holds. He is the only person who has filled this position since the organization of the national banking system.