Question: What is the population of the farther south of the towns of Camberwell and Singleton?

Context paragraphs:
Singleton, New South Wales: Singleton is a town on the banks of the Hunter River in New South Wales, Australia.  Singleton is 197 km north-north-west of Sydney, and 80 km northwest of Newcastle.  At June 2015, Singleton had an urban population of 16,921.

Packera bolanderi: Packera bolanderi is a species of flowering plant in the aster family known by the common names Bolander's ragwort and seacoast ragwort.  It is native to the west coast of the United States from Washington to northern California, where it grows in wet coastal forests and woodlands.  There are two varieties of the species which differ slightly in morphology and habitat occupied; these varieties have been considered separate species by some authors.  The var.  "bolanderi" has thicker leaves, occurs farther south (into California), and occupies more open types of habitat, than does var.  "harfordii".  This plant in general is a perennial herb producing one to three stems up to half a meter tall.  The basal leaves have blades up to 12 centimeters long which are divided into several lobes and borne on long, thin petioles.  Leaves growing farther up the stem are smaller and have more lobes on their blades.  The inflorescence contains several flower heads, each lined with dark green phyllaries.  The head contains many golden yellow disc florets and generally either 8 or 13 yellow ray florets each over a centimeter long.  The fruit is an achene tipped with a pappus of bristles.

Port Elizabeth: Port Elizabeth or The Bay (Xhosa: "iBhayi" ; Afrikaans: "Die Baai" ] ) is one of the largest cities in South Africa; it is situated in the Eastern Cape Province, 770 km east of Cape Town.  The city, often shortened to PE and nicknamed "The Friendly City" or "The Windy City", stretches for 16 km along Algoa Bay, and is one of the major seaports in South Africa.  Port Elizabeth is the southernmost large city on the African continent, just farther south than Cape Town.

Packer Park, Philadelphia: Packer Park is a neighborhood in the South Philadelphia section of Philadelphia, Pennsylvania, United States that originally included 1,200 homes built in two unique builder developments of Packer Park 1950s and Brinton Estates 1990s.  It is now one of four residential communities, including FDR Park to be designated as Packer Park.  The original footprint community is also one of four adjacent communities that form Philadelphia's Sports Complex Special Services District.  The approximate boundaries are Packer Avenue to the north, Hartranft Street to the south including FDR Park farther south, Broad Street to the east known as the Southern Parkway and I-76 to the far west.  Packer Park has been considered home to one of the most organized community groups in the South Philadelphia region.

Avocado Heights, California: Avocado Heights is an unincorporated census-designated place in Los Angeles County, California, United States.  It lies in the San Gabriel Valley, near Puente Hills.  On the northern border lies the unincorporated community of West Puente Valley; on the eastern border the City of Industry.  A thin strip of the City of Industry runs to the south, and the Pomona Freeway and the Puente Hills are farther south.  To the west is the San Gabriel River and the San Gabriel River Freeway, as well as the California Country Club.  Avocado Heights is approximately 15 mi from the downtown Los Angeles Civic Center.  The population was 15,411 at the 2010 census, up from 15,148 at the 2000 census.

Southernmost settlements: Southernmost settlements are cities, towns, weather stations or permanent military bases which are farther south than latitude 45°S.  They are closely related to the Southern Ocean or either the Roaring Forties or Furious Fifties.

Helston: Helston (Cornish: Hellys ) is a town and civil parish in Cornwall, England, United Kingdom.  It is situated at the northern end of the Lizard Peninsula approximately 12 mi east of Penzance and 9 mi south-west of Falmouth.  Helston is the most southerly town on the island of Great Britain and is around 1.5 mi farther south than Penzance.  The population in 2011 was 11,700.

Hornos Island: Hornos Island (Spanish: "Isla Hornos" ) is a Chilean island at the southern tip of South America.  The island is mostly known for being the location of Cape Horn.  It is generally considered South America's southernmost island, but the Diego Ramírez Islands are farther south.  The island is one of the Hermite Islands, part of the Tierra del Fuego archipelago.

Camberwell, New South Wales: Camberwell is a small village just off the New England Highway in the Hunter Region of New South Wales, Australia.  It is 196 kilometres north of Sydney and 15 kilometres northwest of Singleton in Singleton Shire.

Tabiteuea: Tabiteuea, formerly Drummond's Island, is an atoll in the Gilbert Islands, Kiribati, farther south of the Tarawa Atoll.  The atoll consists of two main islands: Eanikai in the north, Nuguti in the south, and several smaller islets in between along the eastern rim of the atoll.  The atoll has a total land area of 38 km2 , while the lagoon measures 365 km2 .  The population numbered 4,899 in 2005.

Supporting paragraphs: Camberwell, New South Wales Singleton, New South Wales
Answer: 16,921