Middlesbrough (/ˈmɪdəlzbrə/ ⓘ MID-əlz-brə) is a port town in North Yorkshire, England. The town's built-up area, an area spanning from the south bank of the River Tees, up to and including Coulby Newham and Nunthorpe, had a population of 148,215[1] at the 2021 UK Census. The town's borough (of similar size) is governed by Middlesbrough Council. It is the postal town further south (including Stokesley and Great Ayton) to the North York Moors National Park.[1] The largest town of Teesside and the largest of the Tees Valley region, it is the direct regional centre for a population of 678,400 in 2021[2] and de facto centre for northern Yorkshire and southern County Durham. A hamlet surrounded by rural farmland, until the Stockton and Darlington Railway expanded in 1830 linking the area's existing economy, the settlement had booms in heavy industry during early 19th century and late 19th century. The town became too reliant on existing declining sectors in the 20th century with diversity of the economy slowly increasing during the late-20th to early-21st centuries. Some of the town's major economic sectors by age of the oldest to newest are a port, ship building, coal (former), ironworks, steel production (metalworks have moved eastwards to between Eston and Redcar), education (notably Teesside University and Middlesbrough College) and the health sector.