List of hill forts in England

There are over 1,350 known hill forts in England and Wales. Given the effects of erosion, some smaller sites have been destroyed and the actual number of hill forts constructed was probably higher, possibly around 1,600. England's hill forts are concentrated in the south and west, with especially high numbers in the south-western peninsula (Devon and Cornwall have a total of 285 hill forts). There are also 570 hill forts in Wales, and some in Scotland. Although some originate in the Bronze Age, the majority of hill forts in Britain were constructed during the Iron Age (about 8th century BC to the Roman conquest of Britain). There was a trend in the 2nd century BC for hill forts to fall out of use.

...
Wikipedia