From South Croydon, Greater London to all cities in Hertfordshire starting with letter A
- Abbots Langley, Greater London
- Adeyfield, Greater London
- Albury, Greater London
- Albury End, Greater London
- Aldbury, Greater London
- Aldenham, Greater London
- Allens Green, Greater London
- Amwell, Greater London
- Ansells End, Greater London
- Anstey, Greater London
- Appspond, Greater London
- Apsley, Greater London
- Ardeley, Greater London
- Ashbrook, Greater London
- Ashwell, Greater London
- Ashwell End, Greater London
- Aspenden, Greater London
- Aston, Greater London
- Aston End, Greater London
- Astrope, Greater London
- Ayot Green, Greater London
- Ayot St Lawrence, Greater London
- Ayot St Peter, Greater London
- Ayres End, Greater London