The 1904 County Championship was the 15th officially organised running of the County Championship, and ran from 9 May to 5 September 1904. Lancashire won their second championship title, while six times champions Yorkshire finished in second place. The previous season's winners, Middlesex, finished in fourth place.
One point was awarded for a win, and one point was taken away for each loss. Final placings were decided by dividing the number of points earned by the number of completed matches (i.e. those that ended in a win or a loss), and multiplying by 100.