51 02060009 Pocomoke
51 02060010 Chincoteague
51 02070001 South Branch Potomac
51 02070004 Conococheague-Opequon
51 02070005 South Fork Shenandoah
51 02070006 North Fork Shenandoah
51 02070007 Shenandoah
51 02070008 Middle Potomac-Catoctin
51 02070010 Middle Potomac-Anacostia-Occoquan
51 02070011 Lower Potomac
51 02080101 Lower Chesapeake Bay
51 02080102 Great Wicomico-Piankatank
51 02080103 Rapidan-Upper Rappahannock
51 02080104 Lower Rappahannock
51 02080105 Mattaponi
51 02080106 Pamunkey
51 02080107 York
51 02080108 Lynnhaven-Poquoson
51 02080109 Western Lower Delmarva
51 02080110 Eastern Lower Delmarva
51 02080201 Upper James
51 02080202 Maury
51 02080203 Middle James-Buffalo
51 02080204 Rivanna
51 02080205 Middle James-Willis
51 02080206 Lower James
51 02080207 Appomattox
51 02080208 Hampton Roads
51 03010101 Upper Roanoke
51 03010102 Middle Roanoke
51 03010103 Upper Dan
51 03010104 Lower Dan
51 03010105 Banister
51 03010106 Roanoke Rapids
51 03010201 Nottoway
51 03010202 Blackwater
51 03010203 Chowan
51 03010204 Meherrin
51 03010205 Albemarle
51 03040101 Upper Yadkin
51 05050001 Upper New
51 05050002 Middle New
51 05070201 Tug
51 05070202 Upper Levisa
51 06010101 North Fork Holston
51 06010102 South Fork Holston
51 06010205 Upper Clinch
51 06010206 Powell