FREDERICKSBURGH, a post-town of Virginia, in North America, and capital of a county. It is situated on the south-west side of the Rappahannock, about a hundred and ten miles from its mouth, and fifty-seven miles south-west of Washington. It is regularly laid out, well built, and contains eight public buildings and four churches. It is a great depot for grain, flour, and tobacco, and numerous flour mills are situated in the vicinity of the town. Being in the centre of a fertile and well-cultivated country, it is flourishing and healthy. The population in 1830 was 3307.