The Belfast of the first decade of the 19th century was a bustling and growing town of some 22,000 inhabitants. It was dominated by the cotton industry and the linen trade. The foundations of such potentially important enterprises as engineering and shipbuilding were being laid. Yet this was still a period when a trip to Dublin took 21 hours by coach (with a double guard for extra security) and when the inhabitants were ferried around the town by sedan chair. The directories here reprinted, from unique copies in the Linen Hall Library, vividly recreate this Belfast of cotton mills and learned societies, sailmakers and booksellers. It will be of interest both to genealogists and to those who care for the history of Belfast.