The 'Add Pub' feature doesn't seem to recognise Isle of Man postcodes, so here's a list of missing pubs that I've come across when researching a visit:
Archibald Knox, Avondale Road, Onchan, IM3 1AG
Ascot Hotel, 7 Empire Terrace, Douglas, IM2 4LE
Bath & Bottle, 6 Victoria Street, Douglas, IM1 2LW
Bordello Wine Bar, 6/7 Peveril Building, Douglas, IM1 2BT
Chequers, Bridson Street, Port Erin, IM9 6AN
Colby Glen, Main Road, Colby, IM9 4LR
Da Vinci's, North Quay, Douglas, IM1 4LB
Drawing Room, 20 Duke Street, Douglas, IM1 2AY
Greens, Main Road, St Johns, IM4 3NA
Grill in the Park, Nobles Park Pavilion, St Ninians Road, Douglas, IM2 4BD
Heron Hotel, Cushag Road, Anagh Coar, Douglas, IM2 2BZ
Horse & Plough, Isle Of Man Business Park, Bradden, Douglas, IM2 2QZ
HQ, 1 Empire Terrace, Douglas, IM2 4LE
Jaks, 43 Loch Promenade, Douglas, IM1 2LZ
Nags Head, 21-23 Victoria Street, Douglas, IM1 2LW
Nexus, Loch Promenade, Douglas, IM1 2LY
Old Courthouse, Athol Street, Douglas, IM1 1LD
Pinewood, Laburnum Avenue, Douglas, IM2 1DE
Quids Inn, Loch Promenade, Douglas, IM1 2NA
Tap Room, Castle Street, Castletown, IM9 1LF
Thirsty Pigeon, 38/40 Victoria Street, Douglas, IM1 2LW
Vibes, Callows Yard, Arbory Street, Castletown, IM9 1DQ
Views, Onchan Park, Onchan, IM3 1HU
Welbeck Hotel, 13-17 Mona Drive, Douglas, IM2 4LE
Whitestone, Station Road, Ballasalla, IM9 2DD