Teesside mainly associated with the local petrochemical, chemical and steel processing industries. The port is an important piece of logistical infrastructure for the NEPIC cluster of process companies. Teesside continues to be used locally to refer the entire urban area and the name can still be seen in the following uses: It has also been adopted for various other purposes as a synonym for the former county of Cleveland. It is common to see Teesside spelled incorrectly as "Teeside", with a single 's'. Teesside Teesside () is the conurbation in the north east of England around the urban centre of Middlesbrough
Teesside the 2001 figure of 18,335. Infilling development may join the two urban areas together. Marske-by-the-Sea is another separate Urban Area nearly contiguous with Redcar with a population of 8,282 down 7% from the 2001 figure of 8,921. Nearby Hartlepool is also sometimes considered as part of Teesside. The Hartlepool area has an urban population of 88,855 an increase of 3% from the 2001 figure of 86,085 and this can be referred to as the Teesside & Hartlepool Urban Area. If this definition is taken into consideration, with the addition of the Eaglescliffe area and Marske, Teesside would have a population