Virginia’s Loudoun County is ‘a little test tube’ for coping with hypergrowth on the far fringes of many American cities.

The growing pains of Loudoun, the nation’s fastest-growing county in the past five years, not only has residents up in arms, but have also drawn the attention of land-use experts across the United States. That’s because exurbs – suburbs at the fringes of metropolitan areas – are growing faster than any other kind of community, according to census data.

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