Download the 20/20A/20B PDF timetable here
Service 20  City Centre - Laira - Marsh Mills - Woodford - Plympton Central

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From Royal Parade via St Andrews Cross Roundabout, Exeter Street Viaduct, Charles Cross Roundabout, Charles Street, Drake Circus [Plymouth University/History Centre], North Hill, Alexandra Road, Lipson Vale, Old Laira Road [Laira], Plymouth Road [opp Sainsburys], Marsh Mills Roundabout, Plymouth Road, Woodford Avenue, Lynwood Avenue, St Margarets Road, Larkham Lane, Plymbridge Road, Crossway, Boringdon Hill, Clifton Avenue, Newnham Road, Strode Road, Glen Road, Moorland Road, Mudge Way [Plympton Central], Ridgeway, Glen Road, Strode Road, Newnham Road, Clifton Avenue, Boringdon Hill, Crossway, Plymbridge Road, Larkham Lane, St Margarets Road, Lynwood Avenue, Woodford Avenue, Plymouth Road, Marsh Mills Roundabout, Plymouth Road [Sainsburys], Old Laira Road [Laira], Lipson Vale, Alexandra Road, North Hill, Drake Circus [History Centre/Plymouth University], Cobourg Street, Mayflower Street, Western Approach, Union Street and Derrys Cross Roundabout to Royal Parade

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Service 20A  City Centre - Laira - Marsh Mills - Woodford - Plympton Central - Lee Mill - Ivybridge

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From Royal Parade via St Andrews Cross Roundabout, Exeter Street Viaduct, Charles Cross Roundabout, Charles Street, Drake Circus [Plymouth University/History Centre], North Hill, Alexandra Road, Lipson Vale, Old Laira Road [Laira], Plymouth Road [opp Sainsburys], Marsh Mills Roundabout, Plymouth Road, Woodford Avenue, Lynwood Avenue, St Margarets Road [Woodford], Larkham Lane, Plymbridge Road, Crossway, Boringdon Hill, Clifton Avenue, Newnham Road, Strode Road, Glen Road, Mudge Way [Plympton Central], Ridgeway, Deep Lane, A38, Lee Mill Plymouth Road, Lee Mill Village, Beech Road, Tesco Lee Mill, Beech Road, A38, Slip Road to Ivybridge, Cornwood Road, Langham Levels, Cleeve Drive, Fairway Avenue, Woodland Road, Cleeve Drive, Ivydene Road, St Johns Road, Western Road and Marjorie Kelly Way to Leonards Road [Ivybridge Town Hall]

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Service 20A  Ivybridge - Lee Mill - Plympton Central - Woodford - Marsh Mills - Laira - City Centre

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From Leonards Road [Ivybridge Town Hall] via Fore Street, Harford Road, Cole Lane, Exeter Street, St Peters Way, Woolcombe Lane, Leonards Road [Ivybridge Town Hall], (Turns at roundabout), Leonards Road [Opp Ivybridge Town Hall], Marjorie Kelly Way, Western Road, St Johns Road, Ivydene Road, Cleeve Road, Woodland Road, Fairway Avenue, Cleeve Drive, Langham Levels, Cornwood Road, B3213 to A38, A38,  Slip Road to Lee Mill [Under A38 Flyover], Beech Road, Tesco Lee Mill, Beech Road, Lee Mill Village, New Park Road, Smithaleigh, A38, Deep Lane, Ridgeway, Mudge Way [Plympton Central], Glen Road, Strode Road, Newnham Road, Clifton Avenue, Boringdon Hill, Crossway, Plymbridge Road, Larkham Lane, St Margarets Road [Woodford], Lynwood Avenue, Woodford Avenue, Plymouth Road, Marsh Mills Roundabout, Plymouth Road [Sainsburys], Old Laira Road [Laira], Lipson Vale, Alexandra Road, North Hill, Drake Circus [History Centre/Plymouth University], Cobourg Street, Mayflower Street, Western Approach, Union Street and Derrys Cross Roundabout to Royal Parade

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Service 20B  (Sunday Only) City Centre - Laira - Marsh Mills - Plymouth Road - Plympton Central

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From Royal Parade via St Andrews Cross Roundabout, Exeter Street Viaduct, Charles Cross Roundabout, Charles Street, Drake Circus [Plymouth University/History Centre], North Hill, Alexandra Road, Lipson Vale, Old Laira Road [Laira], Plymouth Road [opp Sainsburys], Marsh Mills Roundabout, Plymouth Road, Ridgeway [opp St Marys Church], CHANGES TO A SERVICE 20 and operates via Mudge Way [Plympton Central], Moorland Road, then as the Service 20 route from Strode Road to Royal Parade

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Service 20B  (Sunday Only) Plympton Central - Plymouth Road - Marsh Mills - Laira - City Centre

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This service starts as a Service 20 from City Centre to Mudge Way then changes to a Service 20B from Ridgeway [St Marys Church], Plymouth Road, Marsh Mills Roundabout, Plymouth Road [Sainsburys], Old Laira Road [Laira], Lipson Vale, Alexandra Road, North Hill, Drake Circus [History Centre/Plymouth University], Cobourg Street, Mayflower Street, Western Approach, Union Street and Derrys Cross Roundabout to Royal Parade