Name Sites Samples
Henderson County 4 3
Hendry County 1 1
Hennepin County 12 25
Henry County 4 16
Henry County 3 5
Henry County 3 30
Henry County 10 23
Herkimer County 1 1
Hertford County 2 4
Hickman County 2 4
Hickman County 1 1
Hidalgo County 12 16
Highland County 1 1
Highlands County 6 22
Hillsborough County 7 21
Hinds County 2 14
Hitchcock County 1 1
Hodgeman County 2 9
Hoke County 2 3
Holmes County 6 50
Hood County 1 1
Hopkins County 14 99
Horry County 3 15
Houston County 1 1
Houston County 2 8
Houston County 8 14
Howard County 4 7
Howard County 1 3
Hubbard County 2 7
Hudspeth County 14 82