In the four counties I cover, horse country means western Loudoun first. Glenwood Park, just north of the Town of Middleburg, holds the spring and fall steeplechase races; Morven Park, on the edge of Leesburg, holds international eventing; and the Middleburg Hunt and the Loudoun Fairfax Hunt ride the country between them.5,6
Visit Loudoun, the county’s tourism board, says Loudoun is “home to more than 15,000 horses” and calls Middleburg “America’s Horse and Hunt Country Capital,” in its own words.18 The last formal count I found is older: a 2015 University of Virginia study estimated 14,452 horses and 2,738 horse-industry jobs in Loudoun, from 2013 survey data.19
Fairfax and Prince William have their own horse pockets, in the large-lot country around Great Falls and Clifton and in the farmland around Nokesville. A note on county lines: The Plains, Upperville and Great Meadow, which many people picture as Virginia hunt country, are in Fauquier County, which this guide does not cover. I checked the county of every venue on this page. Arlington has no land for keeping horses that I found.