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