St John the Baptist's Church was listed at Grade I by English Heritage on 28 October 1957.
Such buildings are defined as being of "exceptional interest" and greater than national importance.
 As of February 2001, it was one of 16 Grade I listed buildings, and 1,028 listed buildings of all grades, in the district of Mid Sussex.

The ecclesiastical parish of Clayton with Keymer covers three villages, each with one Church of England parish church, and surrounding rural areas towards Burgess Hill, Ditchling and Hurstpierpoint.
 Keymer is served by St Cosmas and St Damian Church, which also has Anglo-Saxon origins but was rebuilt in 1866.
 Hassocks, now linked to Keymer by postwar residential expansion, was served from St Cosmas and St Damian until 1975, when St Francis of Assisi Church was built.
 The parishes of Clayton and Keymer, previously separate legal entities, were united from 25 July 1978 by means of an Order in Council.
St John the Baptist's Church was listed at Grade I by English Heritage on 28 October 1957. Such buildings are defined as being of "exceptional interest" and greater than national importance.  As of February 2001, it was one of 16 Grade I listed buildings, and 1,028 listed buildings of all grades, in the district of Mid Sussex.
The ecclesiastical parish of Clayton with Keymer covers three villages, each with one Church of England parish church, and surrounding rural areas towards Burgess Hill, Ditchling and Hurstpierpoint.  Keymer is served by St Cosmas and St Damian Church, which also has Anglo-Saxon origins but was rebuilt in 1866.  Hassocks, now linked to Keymer by postwar residential expansion, was served from St Cosmas and St Damian until 1975, when St Francis of Assisi Church was built.  The parishes of Clayton and Keymer, previously separate legal entities, were united from 25 July 1978 by means of an Order in Council.
St John the Baptist's Church, Clayton