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In page Parish councils in England:

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In 1974, at the same time as the creation of successor parishes, the law was changed so that any parish council could pass a resolution to declare its area a "town", with the council known as a "town council". The majority of successor parishes, and a number of other small market towns now have town councils, whose powers are exactly the same as those of parish councils, although their chairmen are entitled to style themselves as "town mayor".[1] Similarly, a handful of parishes have been granted city status by letters patent: the council of such a parish is known as "city council" and the chairman is entitled to be known as the "city mayor".[1]