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US Distribution of Active Stallions and Mares Bred
For the year: 2018
State by
Ranking
Mares
Bred
Stallions Avg.
Book
Kentucky17,45824870.4
California2,56416016.0
Florida2,07811717.8
Louisiana1,23410611.6
New York1,1265321.2

Maryland8883326.9
New Mexico7251047.0
Pennsylvania6844814.3
Oklahoma673838.1
Texas530995.4

Indiana511687.5
West Virginia4304010.8
Arkansas400449.1
Ohio366576.4
Washington221317.1

Illinois160295.5
Iowa126196.6
Colorado125323.9
Oregon123186.8
Arizona92156.1

Minnesota84146.0
North Dakota75135.8
Michigan62183.4
Wyoming58115.3
Nebraska53134.1

Idaho49153.3
South Carolina3265.3
Alabama31122.6
Kansas3183.9
Tennessee3083.8

Montana2993.2
Virginia29102.9
Missouri21102.1
New Jersey1882.3
South Dakota1863.0

Utah1362.2
North Carolina1052.0
Massachusetts942.3
Mississippi522.5
Nevada422.0

Wisconsin212.0

Total31,1771,58519.7

States ranked by number of mares bred. Mares bred to two stallions in the same breeding season are counted twice.

Source: The Jockey Club