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County Listings for Split States
Use the County List Search drop-down to see which counties fall within each split state.
County List Search
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California - Northern
California - Southern
Missouri - Northeastern & Southern Missouri (Arkansas Blue Cross/Blue Shield)
Missouri - Northwestern (Blue Cross/Blue Shield of Kansas)
New York - Downstate
New York - Queens
New York - Upstate
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California - Northern
Alameda, CA
Alpine, CA
Amador, CA
Butte, CA
Calaveras, CA
Colusa, CA
Contra Costa, CA
Del Norte, CA
El Dorado, CA
Fresno, CA
Glenn, CA
Humboldt, CA
Inyo, CA
Kern, CA
Kings, CA
Lake, CA
Lassen, CA
Madera, CA
Marin, CA
Mariposa, CA
Mendocino, CA
Merced, CA
Modoc, CA
Mono, CA
Monterey, CA
Napa, CA
Nevada, CA
Placer, CA
Plumas, CA
Riverside, CA
Sacramento, CA
San Benito, CA
San Bernardino, CA
San Francisco, CA
San Joaquin, CA
San Mateo, CA
Santa Clara, CA
Santa Cruz, CA
Shasta, CA
Sierra, CA
Siskiyou, CA
Solano, CA
Sonoma, CA
Stanislaus, CA
Sutter, CA
Tehama, CA
Trinity, CA
Tulare, CA
Tuolumne, CA
Yolo, CA
Yuba, CA
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California - Southern
Imperial, CA
Los Angeles, CA
Orange, CA
San Diego, CA
San Luis Obispo, CA
Santa Barbara, CA
Ventura, CA
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Missouri - Northeastern & Southern Missouri (Arkansas Blue Cross/Blue Shield)
Adair, MO
Audrain, MO
Barry, MO
Barton, MO
Bollinger, MO
Boone, MO
Butler, MO
Callaway, MO
Camden, MO
Cape Girardeau, MO
Carter, MO
Cedar, MO
Chariton, MO
Christian, MO
Clark, MO
Cole, MO
Cooper, MO
Crawford, MO
Dade, MO
Dallas, MO
Dent, MO
Douglas, MO
Dunklin, MO
Franklin, MO
Gasconade, MO
Greene, MO
Hickory, MO
Howard, MO
Howell, MO
Iron, MO
Jasper, MO
Jefferson, MO
Knox, MO
Laclede, MO
Lawrence, MO
Lewis, MO
Lincoln, MO
Linn, MO
Macon, MO
Madison, MO
Maries, MO
Marion, MO
Mcdonald, MO
Miller, MO
Mississippi, MO
Moniteau, MO
Monroe, MO
Montgomery, MO
Morgan, MO
New Madrid, MO
Newton, MO
Oregon, MO
Osage, MO
Ozark, MO
Pemiscot, MO
Perry, MO
Phelps, MO
Pike, MO
Polk, MO
Pulaski, MO
Putnam, MO
Ralls, MO
Randolph, MO
Ripley, MO
Schuyler, MO
Scotland, MO
Scott, MO
Shannon, MO
Shelby, MO
St. Charles, MO
St. Francois, MO
St. Genevieve, MO
St. Louis, MO
Stoddard, MO
Stone, MO
Sullivan, MO
Taney, MO
Texas, MO
Warren, MO
Washington, MO
Wayne, MO
Webster, MO
Wright, MO
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Missouri - Northwestern (Blue Cross/Blue Shield of Kansas)
Andrew, MO
Atchison, MO
Bates, MO
Benton, MO
Buchanan, MO
Caldwell, MO
Carroll, MO
Cass, MO
Clay, MO
Clinton, MO
Daviess, MO
Dekalb, MO
Gentry, MO
Grundy, MO
Harrison, MO
Henry, MO
Holt, MO
Jackson, MO
Johnson, MO
Lafayette, MO
Livingston, MO
Mercer, MO
Nodaway, MO
Pettis, MO
Platte, MO
Ray, MO
Reynolds, MO
Saline, MO
St. Clair, MO
St. Louis City, MO
Vernon, MO
Worth, MO
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New York - Downstate
Bronx, NY
Columbia, NY
Delaware, NY
Dutchess, NY
Greene, NY
Kings (Brooklyn), NY
Nassau, NY
New York (Manhattan), NY
Orange, NY
Putnam, NY
Richmond (Staten Island), NY
Rockland, NY
Suffolk, NY
Sullivan, NY
Ulster, NY
Westchester, NY
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New York - Queens
Queens, NY
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New York - Upstate
Albany, NY
Allegany, NY
Broome, NY
Cattaraugus, NY
Cayuga, NY
Chautauqua, NY
Chemung, NY
Chenango, NY
Clinton, NY
Cortland, NY
Erie, NY
Essex, NY
Franklin, NY
Fulton, NY
Genesee, NY
Hamilton, NY
Herkimer, NY
Jefferson, NY
Lewis, NY
Livingston, NY
Madison, NY
Monroe, NY
Montgomery, NY
Niagara, NY
Oneida, NY
Onondaga, NY
Ontario, NY
Orleans, NY
Oswego, NY
Otsego, NY
Rensselaer, NY
Saint Lawrence, NY
Saratoga, NY
Schenectady, NY
Schoharie, NY
Schuyler, NY
Seneca, NY
Steuben, NY
Tioga, NY
Tompkins, NY
Warren, NY
Washington, NY
Wayne, NY
Wyoming, NY
Yates, NY
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