Portstewart  is a town in County Londonderry, Northern Ireland and had a population of 7,803 people in the 2001 Census. It is a seaside resort, seen by residents as a grander version of neighbouring Portrush. Of the two towns, Portstewart is decidedly quieter with more sedate attractions.

Its harbour and scenic coastal paths form an Atlantic promenade leading to 2 miles of golden strand (Portstewart Strand). Portstewart is probably best-known for this sandy beach, popular with surfers and its magnificent golf course.

Portstewart was a popular holiday destination for Victorian middle-class families. Its long, crescent-shaped seafront promenade is sheltered by rocky headlands. It is a reasonably prosperous town. Most of the town is contained in the Strand electoral ward and this is one of the most affluent areas in Northern Ireland. In a deprivation index of the 582 electoral wards in Northern Ireland the Strand Ward in the town was ranked 570, where 1 (most deprived) and 582 (least deprived). According to NI Neighbourhood Information Service

House prices in Portstewart are among the highest in the province. The North Coast region (Coleraine/Limavady area) has the highest property prices in Northern Ireland, higher than those of affluent south Belfast. (according to the University of Ulster Quarterly House Price Index report produced in partnership with Bank of Ireland and the Northern Ireland Housing Executive - March 2006).

Portstewart is one of the most desirable places to live or own a holiday home in Northern Ireland. Due to its popularity for second home ownership there has been concern in recent years about the pace of development in the town. The number of second homes/apartments being purchased has led to rapid inflation of house prices and pricing locals out of the market.

Portstewart is one of the most integrated towns in Northern Ireland with the religious demographics similar to the population of Northern Ireland as a whole. It is often praised for the excellent community relations within the town. Dominican College, a Catholic grammar school has a high proportion of Protestant students and staff.

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