List of highways numbered 23
Route 23, or Highway 23, can refer to:
International
    
    
Australia
    

 Federal Highway (Australia)
 Monaro Highway
 (South Australia)
 Dorat Road (not signed everywhere)
Austria
    
    
Canada
    
    
Costa Rica
    
    
Czech Republic
    

 I/23 Highway; Czech: Silnice I/23
Finland
    
    
Ireland
    
    
Korea, South
    
 National Route 23- Gukjido 23
 
Malaysia
    
    
Mexico
    
    
New Zealand
    
    
Norway
    
    
United Kingdom
    
    
United States
    
 U.S. Route 23
 Alabama State Route 23
 Arkansas Highway 23
 Arkansas Highway 23W (former)
 California State Route 23
 Colorado State Highway 23
 Delaware Route 23
 Florida State Road 23
 Georgia State Route 23
 Illinois Route 23
 Indiana State Road 23
 Iowa Highway 23
 K-23 (Kansas highway)
 Louisiana Highway 23
 Maine State Route 23
 Maryland Route 23
- Maryland Route 23B (former)
 
 Massachusetts Route 23
 M-23 (Michigan highway) (former)
 Minnesota State Highway 23
 Mississippi Highway 23
 Missouri Route 23
- Missouri Route 23 (1922) (former)
 
 Montana Highway 23
 Nebraska Highway 23
 Nevada State Route 23 (former)
 New Jersey Route 23
 New Mexico State Road 23
 New York State Route 23
 County Route 23 (Allegany County, New York)
 County Route 23 (Cattaraugus County, New York)
 County Route 23 (Cayuga County, New York)
 County Route 23 (Clinton County, New York)
 County Route 23 (Dutchess County, New York)
 County Route 23 (Genesee County, New York)
 County Route 23B (Greene County, New York)
 County Route 23C (Greene County, New York)
 County Route 23 (Herkimer County, New York)
 County Route 23 (Lewis County, New York)
 County Route 23 (Livingston County, New York)
 County Route 23 (Niagara County, New York)
 County Route 23 (Onondaga County, New York)
 County Route 23 (Orange County, New York)
 County Route 23 (Oswego County, New York)
 County Route 23 (Otsego County, New York)
 County Route 23 (Putnam County, New York)
 County Route 23 (Rensselaer County, New York)
 County Route 23 (Rockland County, New York)
 County Route 23 (Schuyler County, New York)
 County Route 23 (St. Lawrence County, New York)
 County Route 23 (Suffolk County, New York)
 County Route 23 (Sullivan County, New York)
 County Route 23 (Tioga County, New York)
 County Route 23 (Warren County, New York)
 County Route 23 (Washington County, New York)
 North Carolina Highway 23 (former)
 North Dakota Highway 23
 Ohio State Route 23 (1923-1927) (former)
 Oklahoma State Highway 23
 Oregon Route 23 (former)
 Pennsylvania Route 23
 South Carolina Highway 23
 South Dakota Highway 23 (former)
 Tennessee State Route 23
 Texas State Highway 23
 Utah State Route 23
 Vermont Route 23
 State Route 23 (Virginia 1918-1933) (former)
 Washington State Route 23
 West Virginia Route 23
 Wisconsin Highway 23
- Territories
 
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