Question: Hawaii Route 31 begins in at an intersection with Hawaii Routes 310 and 311 in a census-designated place with at the 2010 census a population of what?

Context paragraphs:
Sanborn, New York: Sanborn is a hamlet (and census-designated place, population: 1,645 in 2010 census) in the Towns of Cambria, Lewiston, and Wheatfield, New York, USA, on the southern side of the intersection of New York State Route 429 and New York State Route 31.  Originally called South Pekin after the formerly thriving hamlet of Pekin to the north, Sanborn was renamed in 1866 after Ebenezer Sanborn.  The ZIP code for Sanborn is 14132.

Lahaina, Hawaii: Lāhainā is the largest census-designated place (CDP) in West Maui, Maui County, Hawaii, United States, and the gateway to the Ka'anapali and Kapalua beach resorts to its north.  As of the 2010 census, the CDP had a resident population of 11,704.  Lahaina encompasses the coast along Hawaii Route 30 from a tunnel at the south end, through Olawalu, and to the CDP of Napili-Honokowai to the north.  During the tourist season, the population can swell to nearly 40,000 people.

Hawaii Route 31: Hawaii Route 31, also known as the Pi'ilani Highway, is a 38-mile road on the island of Maui in the U.S. state of Hawaii.  The state road begins in at an intersection with Hawaii Routes 310 and 311 in the West Maui town of Kihei.  The highway formerly ran parallel to the coast all the way to the southern terminus of the Hana Highway (Route 360), until developments in Wailea and Makena blocked access. .  The Kihei section of the highway now terminates in Wailea, and the much longer Kaupo section, which is county-maintained as County Road 31, connects Route 37 near Kula to the Route 360 south of Hana (at the western border of Haleakala National Park).

Hāʻena, Kauai County, Hawaii: Hāʻena is an unincorporated community and census-designated place on the island of Kauai in Kauai County, Hawaii, United States.  Its population was 431 as of the 2010 census.  The community is located on the north side of the island along Hawaii Route 560.

Dranesville, Virginia: Dranesville is a census-designated place (CDP) in Fairfax County, Virginia, United States.  Dranesville is located on the Leesburg Pike (State Route 7) at its intersection with Georgetown Pike (State Route 193).  The U.S. Census Bureau defines Dranesville as a census-designated place (CDP) with a population of 11,921 as of 2010.

Kihei, Hawaii: Kīhei is a census-designated place (CDP) in Maui County, Hawaiʻ i, United States.  The population was 20,881 at the 2010 census.

Discovery Harbour, Hawaii: Discovery Harbour is an unincorporated community and census-designated place on the island of Hawaii in Hawaii County, Hawaii, United States.  Its population was 949 as of the 2010 census.  The community is located near the island's southern tip, south of Hawaii Route 11.

Bear Rocks, Pennsylvania: Bear Rocks is an unincorporated community and census-designated place in Bullskin Township, Fayette County, Pennsylvania, United States.  Its is located along the south side of Pennsylvania Route 31 in northern Fayette County, on the western slope of Chestnut Ridge.  The elevation ranges from 1150 ft above sea level at the northwest end of the community, in the valley of Jacobs Creek, to 2196 ft near the southeast corner of the community, at the intersection of Kreinbrook Hill Road and Sky Top Road.  As of the 2010 census the population of the CDP was 1,048.

ʻUalapuʻe, Hawaii: ʻUalapuʻe is an unincorporated community and census-designated place on the island of Molokai in Maui County, Hawaii, United States.  Its population was 425 as of the 2010 census.  The community is located along Hawaii Route 450 on the southeast coast of the island of Molokai.

Antrim, New Hampshire: Antrim is a town in Hillsborough County, New Hampshire, United States.  The population was 2,637 at the 2010 census.  The primary settlement in the town, where 1,397 people resided at the 2010 census, is defined as the Antrim census-designated place (CDP) and is located at the intersection of U.S. Route 202 and New Hampshire Route 31.  The town of Antrim also includes the villages of Antrim Center, North Branch, Clinton Village and South Village.

Supporting paragraphs: Hawaii Route 31 Kihei, Hawaii
Answer: 20,881