Map of BT31 9JF postcode 
    
	
  
      
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            General information
            
              
                
              
              
                
                  | Postcode | BT31 9JF | 
                  
                    | Post Town | Castlewellan | 
                
                
                
                  | Businesses |  | 
              
              
            
          
        
          
            Geography
            
              
              
              
                
                  |  | Latitude | 54.286789 | 
                
                  |  | Longitude | -5.927667 | 
                  
                    |  | Easting | 144470 | 
                  
                    |  | Northing | 495026 | 
                  
                    |  | Grid reference | SB444950 | 
                
                  |  | UTM reference | 30U 309440 6019385 | 
                
                  |  | what3words | booms.unusually.into | 
                
                  |  | FixPhrase | crumb lividly subatomic utility | 
                  
                    |  | Plus code | 9C6P73PC+PW | 
                
                  |  | Altitude | 99 metres (326 feet) | 
                
                  |  | Sunrise (today) | 7:24 | 
                
                  |  | Sunset (today) | 16:52 | 
                
                  |  | Distance away |  | 
                  
                    |  | Distance to sea | 6 KMs (3.7 miles) | 
              
              
            
          
        
        
            
              
              
                Administrative areas 
              
                
                  
                        
                          | Ward | Dundrum | N08001021 | 
                      
                        | District | Newry, Mourne and Down | N09000010 | 
                      
                        | Constituency (2024) | South Down | N05000015 | 
                        | MP | Chris Hazzard | Sinn Féin | 
|---|
                      | Police force | PSNI | 
|---|
                      | Water company | Northern Ireland Water | 
|---|
                      
                        | NUTS/ITL 3 | Newry, Mourne and Down | 
                      
                        | NUTS/ITL 2 | Northern Ireland | 
                      
                        | NUTS/ITL 1 | Northern Ireland | 
                    
                      | Country | Northern Ireland | N92000002 | 
                  
                  
                
              
          
    
      
        Data
        
          
              
                | Date introduced | December 1984 | 
            
              | Last updated | September 2025 | 
              
                | User type | Small (addresses receive less than 25 items of mail per day) | 
                    
              
                | Quality | Within the building of the matched address closest to the postcode mean | 
          
          
        
      
          
          
        
          
            Demographics
            
              
                  
                    | Population (2011) | 19 |  | 
                  
                    | Households (2011) | 5 |  | 
                
                  | Index of Multiple Deprivation (2019) | Most deprivedLeast deprived | 
                  | Census output area (2021) | N20003332 |  | 
|---|
                  | Census output area (2011) | 1A1 |  | 
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                  | Lower layer super output area (2011) | Dundrum | 95NN12W1 | 
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                  | Travel to work area | Belfast | N12000002 | 
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          Useful links for BT31 9JF
          
         
          
      
  Contains OS data © Crown copyright and database right 2025 
  Contains Royal Mail data © Royal Mail copyright and database right 2025 
  Contains National Statistics data © Crown copyright and database rights 2025 
  Source: Office for National Statistics licensed under the Open Government Licence v.3.0
  Contains data from Wikipedia covered by the Creative Commons license