Question: What was the population at the 2011 Census of the suburb of which St Andrew's Church, Brighton is the Anglican parish church?

Context paragraphs:
St Andrew's Church, Crosby Garrett: St Andrew's Church is in the village of Crosby Garrett, Cumbria, England.  It is an active Anglican parish church in the deanery of Appleby, the archdeaconry of Carlisle, and the diocese of Carlisle.  Its benefice is united with those of Kirkby Stephen Parish Church and St Mary, Mallerstang.  The church is recorded in the National Heritage List for England as a designated Grade I listed building.

Avalanche Memorial Church: The Avalanche Memorial Church, also known as the Church of St Andrew, is a 19th-century Anglican parish church, located in Southwell village, on the Isle of Portland, Dorset.  It was built in 1879 and remains active to date, as part of the Portland Parish - a host of three churches; the other two being St. John's Church (St John the Baptist) and All Saints Church.  The church, along with its boundary wall, has been a Grade II Listed building since September 1978.

St Andrew's Church, Church Road, Hove: St Andrew's Church is an Anglican church in Church Road, Hove, in the English city of Brighton and Hove.  It is usually referred to as St Andrew (Old Church) to distinguish it from another St Andrew's Church in Waterloo Street, elsewhere in Hove.  It served as Hove's parish church for several centuries until 1892, although the building was in a state of near-ruin until Hove began to grow from an isolated village to a popular residential area in the early 19th century.

St Andrew's Church, Plymouth: The Minster Church of St Andrew, also known as St Andrew's Church, Plymouth is an Anglican church in Plymouth.  It is the original parish church of Sutton, one of the three towns which were later combined to form the city of Plymouth.  The church is the largest parish church in the historic county of Devon and was built in the mid to late 15th century.  It was designated as a Minster Church in 2009 and it continues to operate as the focus for religious civic events for the city and as a bustling evangelical church.

St Andrew's Church, Brighton: St Andrew's Church, Brighton, is the Anglican parish church of the beachside suburb of Brighton, Melbourne, Victoria, Australia.

St Andrew, Stoke Newington: St Andrew, Stoke Newington is a Grade II* listed Anglican parish church on Bethune Road in Stamford Hill (on the border of Stoke Newington), in the London Borough of Hackney, England.  The church, which is dedicated to St Andrew, is located at the junction of Bethune Road and Dunsmure Road in London N16.

St Mary's Church, Acton: St Mary's Church is an active Anglican parish church located in Monk's Lane, Acton, a village to the west of Nantwich, Cheshire, England.  Since 1967 it has been designated a Grade I listed building.  A church has been present on this site since before the time of the Domesday Survey.  The tower is the oldest in Cheshire, although it had to be largely rebuilt after it fell in 1757.  One unusual feature of the interior of the church is that the old stone seating around its sides has been retained.  In the south aisle are some ancient carved stones dating back to the Norman era.  The architectural historian Alec Clifton-Taylor includes the church in his list of 'best' English parish churches.  In the churchyard is a tall 17th-century sundial.  The church is an active Anglican parish church in the diocese of Chester, the archdeaconry of Macclesfield and the deanery of Nantwich.  Its benefice is united with those of St David, Wettenhall, St Oswald, Worleston, and St Bartholomew, Church Minshull.

Brighton, Victoria: Brighton is an affluent beach-side suburb of Melbourne, Victoria, Australia, 11 km south-east of Melbourne's central business district.  Its local government area is the City of Bayside.  At the 2011 Census, Brighton had a population of 21,257.  Brighton is named after Brighton in England.

St Andrew's Church, Penrith: St Andrew's Church is in the centre of the town of Penrith, Cumbria, England.  It is an active Anglican parish church in the deanery of Penrith, the archdeaconry of Carlisle, and the diocese of Carlisle.  Its benefice is united with those of Christ Church, Penrith; St John, Newton Reigny and St John the Evangelist, Plumpton Wall.  The church is recorded in the National Heritage List for England as a designated Grade I listed building.  At one time St Andrew's had a chapel of ease or mission church in Brougham Street in the Penrith suburb of Castletown called St Saviours and another, All Hallows at the hamlet of Bowscar just to the north of the town.

St Andrew's Church, Roker: St Andrew's, Roker (1905-7) is an Anglican parish church in Sunderland, England.  It is recognised as one of the finest churches of the first half of the twentieth century and the masterpiece of Edward Schroeder Prior.  The design of St Andrew's drew together many of the strings of Prior's philosophy and approach to design and building.  Three years before commencing St Andrew's, Prior had written that the architect's first purpose was to provide;

Supporting paragraphs: St Andrew's Church, Brighton Brighton, Victoria
Answer: 21,257