These are the stations at the edges of the London Transport system with their current Zone (2024)
- Amersham Station Metropolitan Line 9
- Brentwood Station 9
- Broxbourne Station 11
- Bushey Station London Overground and London Midland 8
- Carpenders Park Station London Overground 7
- Chafford Hundred c2c 10/A/G
- Chalfont & Latimer Station Metropolitan Line and Chiltern Railways 8
- Chesham Station Metropolitan Line 9
- Cheshunt Station 8
- Chorleywood Station Metropolitan Line and Chiltern Railways 7
- Croxley Station Metropolitan line 7
- Dartford Station 8
- Earlswood Station
- Gatwick Airport Station 14
- Grays Station c2c 10/A/G
- Hertford East Station 11/B
- Hertford North 11/B
- Horley Station 13/D
- Merstham Station 13/D
- Moor Park Station Metropolitan line 6 & 7
- Ockendon Station c2c G
- Purfleet Station c2c Thurrock G
- Redhill Station 13/D
- Rickmansworth Station Metropolitan line and Chiltern Railways 7
- Rye House Station 11/B
- St Margarets Station 11/B
- Salfords Station 13/B
- Shenfield Station C
- Swanley Station 8
- Theobalds Grove Station 7
- Waltham Cross Station 7
- Ware Station 11/B
- Watford Station Metropolitan Line 7
- Watford High Street Station London Overground 8
- Watford Junction Station London Overground 10/A/W
For more information on the outer reaches of the travelcard system see the Wikipedia article [1]