Please select a state for its specific regional definitions by county.
Colorado
Connecticut
Florida
Michigan
Minnesota
National - Red/Blue/Purple States
New Jersey
New York City
New York State
Ohio
Pennsylvania
Wisconsin

Colorado Regions:

Denver/Boulder:

• Adams
• Broomfield
• Boulder
• Denver

Arapahoe/Jefferson:

• Arapahoe
• Jefferson

West:

• Archuleta
• Delta
• Dolores
• Garfield
• Grand
• Hinsdale
• Jackson
• La Plata
• Larimer
• Mesa
• Mineral
• Moffat
• Montezuma
• Montrose
• Ouray
• Rio Blanco
• Rio Grande
• Routt
• San Juan
• San Miguel
• Weld

Rest of State:

• Alamos
• Baca
• Bent
• Chaffee
• Cheyenne
• Clear Creek 
• Conejos
• Costilla
• Crowley
• Custer
• Douglas
• Eagle
• El Paso 
• Elbert
• Fremont
• Gilpin
• Gunnison
• Huerfano
• Kiowa
• Kit Carson
• Lake 
• Las Animas
• Lincoln
• Logan
• Morgan
• Otero
• Park
• Philips
• Pitkin
• Prowers
• Pueblo
• Saguache
• Sedgwick
• Summit
• Teller
• Washington
• Yuma

Connecticut Regions (by county):

• Fairfield 
• Hartford 
• Litchfield 
• Middlesex and New Haven 
• Tolland, Windham, and  New London 

Florida Regions (by county):

North/Panhandle:

• Escambia
• Santa Rosa
• Okaloosa
• Walton
• Holmes
• Washington
• Bay
• Jackson
• Calhoun
• Gulf
• Gadsden
• Liberty
• Franklin
• Leon
• Wakulla
• Jefferson
• Madison
• Taylor
• Hamilton
• Suwanee
• Lafayette
• Dixie
• Columbia
• Gilchrist
• Levy
• Baker
• Union
• Alachua
• Nassau
• Duval
• Bradford
• Clay
• St Johns
• Putnam

Bay Area:

• Hernando
• Pasco
• Pinellas
• Hillsborough
• Polk
• Manatee
• Hardee

Central:

• Citrus
• Marion
• Flagler
• Volusia
• Sumter
• Lake
• Seminole
• Orange
• Brevard
• Osceola
• Indian River
• Okeechobee
• St Lucie
• Martin
• Highlands
• Glades
• De Soto

Southwest:

• Sarasota
• Charlotte
• Lee
• Collier

Southeast:

• Hendry
• Palm Beach
• Broward
• Miami Dade
• Monroe

Michigan Regions:

Wayne County:

• Wayne

Suburbs:

• Oakland 
• Macomb

Southwest:

• Allegan
• Barry
• Berrien
• Branch
• Cass
• Clinton
• Eaton
• Hillsdale
• Ionia
• Kalamazoo
• Kent
• Lenawee
• Ottawa
• St. Joseph
• Van Buren  

Rest of State:

• Alcona
• Alger
• Alpena
• Antrim
• Arenac
• Baraga Bay
• Benzie
• Calhoun
• Charlevoix
• Cheboygan
• Chippewa
• Clare
• Crawford
• Delta
• Dickinson
• Emmet
• Genesee
• Gladwin
• Gogebic
• Grand Traverse
• Gratiot
• Houghton
• Huron
• Ingham
• Iosco
• Iron
• Isabella
• Jackson
• Kalkaska
• Keweenaw
• Lake
• Lapeer
• Leelanau
• Livingston
• Luce
• Mackinac
• Manistee
• Marquette
• Mason
• Mecosta
• Menominee
• Midland
• Missaukee
• Monroe
• Montcalm
• Montmorency
• Muskegon
• Newaygo
• Oceana
• Ogemaw
• Ontonagon
• Osceola
• Oscoda
• Otsego
• Presque Isle
• Roscommon
• Saginaw
• Sanilac
• Schoolcraft
• Shiawassee
• St. Clair
• Tuscola
• Washtenaw
• Wexford

Minnesota Regions:

Minneapolis/St. Paul:

• Hennepin
• Ramsey

Twin Cities Suburbs:

• Anoka
• Carver
• Chisago
• Dakota
• Isant
• Scott
• Washington
• Wright

West:

• Becker
• Beltrami
• Benton
• Big Stone
• Brown
• Cass
• Chippewa
• Clay
• Clearwater
• Cottonwood
• Crow Wing
• Douglas
• Grant
• Hubbard
• Jackson
• Kandiyohi
• Kittson
• Lac Qui
• Parle
• Lake of the Woods
• Lincoln
• Lyon
• Mahnomen
• Marshall
• Martin
• Mcleod
• Meeker
• Morrison
• Murray
• Nobles
• Norman 
• Otter Tail
• Pennington
• Pipestone
• Polk
• Pope
• Red Lake
• Redwood
• Renville
• Rock
• Roseau
• Sherburne
• Sibley
• Stearns
• Stevens
• Swift
• Todd
• Traverse
• Wadena
• Wilkin
• Yellow Medicine 

East:

• Aitkin
• Blue Earth
• Carlton
• Cook
• Dodge
• Faribault
• Fillmore
• Freeborn
• Goodhue
• Houston
• Itasca
• Kanabec
• Koochiching
• Lake
• Le Sueur
• Mille Lacs
• Mower
• Nicollet
• Olmsted
• Pine
• Rice
• St. Louis
• Steele
• Wabasha
• Waseca
• Watonwan
• Winona

National - Red, Blue and Purple States - Definitions and state listings

RED - Bush won by more than 5 percentage points in the 2004 Presidential election.
BLUE - Kerry won by more than 5 percentage points in the 2004 Presidential election.
PURPLE - There are 13 purple states -- 12 in which there was a margin of five points or less in the 2004 popular vote between Bush and Kerry, plus Missouri, historically considered the nation's most accurate barometer of presidential voting. These states have 153 of the 270 electoral votes needed to capture the presidency.

Blue States:

Purple States:

New Jersey Regions- Urban, Suburban, Exurban, Phillyland, Shore (by county):
The counties in each of those regions are:

Urban:

• Hudson
• Essex

Suburban:

• Bergen
• Passaic
• Union
• Middlesex
• Mercer

ExUrban:

• Morris
• Somerset
• Warren
• Sussex
• Hunterdon

Phillyland:

• Burlington
• Camden
• Cape May
• Cumberland
• Gloucester
• Salem

Shore:

• Atlantic
• Monmouth
• Ocean

New York City Regions (by county):

• New York (Manhattan)
• Bronx
• Kings (Brooklyn)
• Queens
• Richmond  (Staten Island)

New York State Regions - Upstate, New York City, Suburbs (by county): 

These counties in each of those regions are:

Upstate:

• Albany
• Allegany
• Broome
• Cattaraugus
• Cayuga
• Chautauqua
• Chemung
• Chenango
• Clinton
• Columbia
• Cortland
• Delaware
• Dutchess
• Erie
• Essex
• Franklin
• Fulton
• Genesee
• Greene
• Hamilton
• Herkimer
• Jefferson
• Lewis
• Livingston
• Madison
• Monroe
• Montgomery
• Niagara
• Oneida
• Onondaga
• Ontario
• Orange
• Orleans
• Oswego
• Otsego
• Putnam
• Rensselaer
• Saratoga
• Schenectady
• Schoharie
• Schuyler
• Seneca
• St.Lawrence
• Steuben
• Sullivan
• Tioga
• Tompkins
• Ulster
• Warren
• Washington
• Wayne
• Wyoming
• Yates

New York City: (also see above)

• Bronx
• Kings
• New York
• Queens
• Richmond

Suburbs:

• Nassau
• Rockland
• Suffolk
• Westchester

Ohio Regions:

Central:

• Coshocton 
• Crawford  
• Delaware  
• Fairfield 
• Fayette   
• Franklin  
• Hardin    
• Hocking   
• Knox      
• Licking   
• Madison   
• Marion    
• Morgan    
• Morrow    
• Muskingum 
• Perry     
• Pickaway  
• Pike      
• Ross      
• Union

North East:

• Ashland      
• Ashtabula    
• Carroll      
• Columbiana   
• Cuyahoga     
• Erie         
• Geauga       
• Holmes       
• Huron        
• Lake         
• Lorain       
• Mahoning     
• Medina       
• Portage      
• Richland     
• Stark        
• Summit       
• Trumbull     
• Tuscarawas   
• Wayne         

North West:

• Defiance     
• Fulton       
• Hancock      
• Henry        
• Lucas        
• Ottawa       
• Putnam       
• Sandusky     
• Seneca       
• Williams     
• Wood         
• Wyandot 

South East:

• Athens       
• Belmont      
• Gallia       
• Guernsey     
• Harrison     
• Jackson      
• Jefferson    
• Lawrence     
• Meigs        
• Monroe       
• Noble        
• Scioto       
• Vinton       
• Washington 

South West:

• Adams        
• Brown        
• Butler       
• Clermont     
• Clinton      
• Hamilton     
• Highland     
• Warren

West Central:

• Allen        
• Auglaize 
• Champaign    
• Clark        
• Darke        
• Greene       
• Logan        
• Mercer       
• Miami        
• Montgomery   
• Paulding     
• Preble       
• Shelby       
• Van Wert

Pennsylvania Regions – Allegheny, Philadelphia, NorthEast, SouthEast, NorthWest, SouthWest, Central (by county):
The counties in each of those regions are:
Allegheny
 
Philadelphia

NorthEast:

• Carbon
• Lackawanna
• Lehigh
• Luzerne
• Monroe
• Northampton
• Pike
• Susquehanna
• Wayne
• Wyoming

SouthEast:

• Bucks
• Chester
• Delaware
• Montgomery

NorthWest:

• Armstrong
• Butler
• Cameron
• Clarion
• Clearfield
• Crawford
• Elk
• Erie
• Forest
• Jefferson
• Lawrence
• Mercer
• Venango
• Warren

SouthWest:

• Beaver
• Cambria
• Fayette
• Greene
• Indiana
• Somerset
• Washington
• Westmoreland

Central:

• Adams
• Bedford
• Berks
• Blair
• Bradford
• Centre
• Clinton
• Columbia
• Cumberland
• Dauphin
• Franklin
• Fulton
• Huntingdon
• Juniata
• Lancaster
• Lebanon
• Lycoming
• McKean
• Mifflin
• Montour
• Northumberland
• Perry
• Potter
• Schuylkill
• Snyder
• Sullivan
• Tioga
• Union
• York

Wisconsin Regions:

Milwaukee:

• Milwaukee

Milwaukee Vicinity:

• Dodge
• Fond
• Du Lac
• Jefferson
• Ozaukee
• Sheboygan
• Washington
• Waukesha

South:

• Adams
• Columbia
• Dane
• Grant
• Green
• Iowa
• Juneau
• Kenosha
• Lafayette
• Marquette
• Racine
• Richland
• Rock
• Sauk
• Walworth

Rest of State:

• Ashland
• Barron
• Bayfield
• Brown
• Buffalo
• Burnett
• Calumet
• Chippewa
• Clark
• Crawford
• Door
• Douglas
• Dunn
• Eau Claire
• Florence
• Forest
• Green Lake
• Iron
• Jackson
• Kewaunee
• La Crosse
• Langlade
• Lincoln
• Manitowoc
• Marathon
• Marinette
• Menominee
• Monroe
• Oconto
• Oneida
• Outagamie
• Pepin
• Pierce
• Polk
• Portage
• Price
• Rusk
• Sawyer
• Shawano
• St. Croix
• Taylor
• Trempealeau
• Vernon
• Vilas
• Washburn
• Waupaca
• Waushara
• Winnebago
• Wood