Teesside (//) is a built-up area around the River Tees in the north of England, split between County Durham and North Yorkshire. The name was initially used as a county borough in the North Riding of Yorkshire.
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|Sovereign state||United Kingdom|
|Region||North East England|
|County Borough of Teesside||1968–1974|
|Time zone||GMT (UTC)|
|• Summer (DST)||UTC+1 (BST)|
|Postcodes||TS1-8 & 10-27|
The number of people employed in this type of work has declined, steel-making (British Steel) and chemical manufacture (Imperial Chemical Industries (ICI)) and have been replaced to a large extent by high technology science development and service sector roles.