Johnstone South and Elderslie elects four councillors and covers the southern half of the town of
Johnstone including the neighbourhoods of Cochrane Castle, Corseford, Johnstone Castle, Quarrelton, Spateston and Thorn (the division being the
Ayrshire Coast Line railway tracks) and the adjacent village of
Elderslie. When the ward was created in 2007 it was named
Johnstone South, Elderslie and Howwood and included the village of
Howwood, but the 2017 boundary review removed Howwood (and the rural hinterland up to the local authority boundaries with
East Renfrewshire and
North Ayrshire) and assigned it to the Johnstone North, Kilbarchan and Lochwinnoch ward, both entities being renamed accordingly. Some territory was gained from the Paisley Northwest ward, namely streets west of the course of the former
Paisley and Barrhead District Railway tracks at Barskiven Road, though most of the developed land comprises the non-residential Phoenix Retail Park and St James Business Park. In 2020, the ward's population was 15,860.
Councillors ==Johnstone North, Kilbarchan, Howwood and Lochwinnoch==