Doing some research on Google I have found these suppliers of Digital Marketing who are based in Teesside, rather than just ranking for the search term and created a small directory. I have no relationship to any of these suppliers and therefore should not be see as a recommendation. Those companies that do not provide a physical address on their websites, are not included.
Acquiro
Hankinson House,
Falcon Court
Preston Farm,
Stockton-on-Tees
TS18 3TX
01642 130340
https://calmdigital.com
Outrank
1 River Court
Brighouse Business Village
Riverside Park Road
Middlesbrough
Cleveland
TS2 1RT
01642 931380
https://outrank.co.uk
Calm Digital
Boho One
Bridge Street West
Middlesbrough
TS2 1AE
01642 903030
https://calmdigital.com
Surge Marketing Solutions,
6 Eggleston Court,
Riverside Park Ind Est,
Middlesbrough,
TS2 1RU
01642 130340
https://surgemarktingsolutions.co.uk
Yellow Box Marketing
Fusion Hive
North Shore Road
Stockton-on-Tees
TS18 2NB
01642 715340
https://yellowboxmarketing.co.uk
MarketMe Ltd
6-8 Yarm Road
Stockton-on-Tees
TS18 3NA
01642 676338
https://marketme.ltd
VisualSoft
Visualsoft House
Prince’s Wharf
Stockton-on-Tees
TS17 6QY
01642 633604
https://visualsoft.co.uk
Sayu Limited
Scotswood House
Teesdale South
Thornaby Place
Stockton-on-Tees
TS17 6SB
01642 664550
https://sayu.co.uk
New Wave Digital
Boho Five,
Bridge St East,
Middlesbrough,
TS2 1NY
01642 424230
https://newwavedigital.co.uk
This is not a comprehensive list, do a Google search, but look to see contact information to ensure the digital marketing company is local to Teesside.