Question: How many people were in the city that is the seat of the county North Port, Florida is in as of 2013?

Context articles: North Port Oval
WKDW-LP
North Port Passenger Terminal
Port Charlotte Town Center
Sarasota County, Florida
S80 Port of Taicang North Port Expressway
Little Salt Spring
Florida's 16th congressional district
North Port, Florida
Sarasota, Florida

North Port Oval, also known as the Port Melbourne Cricket Ground or by the sponsored name Fortburn Stadium, is an Australian rules football and cricket stadium located in Port Melbourne, Australia.
 The capacity of the venue is 12,000 people.
 Home to both the Port Melbourne Cricket Club and the Port Melbourne Football Club the ground will typically host two matches in the first week of VFL finals, as well as both semi-finals and both preliminary finals.
WKDW-LP is a Variety formatted broadcast radio station licensed to North Port, Florida, serving North Port and Warm Mineral Springs in Florida.
 WKDW-LP is owned and operated by Community Broadband Radio Association, Inc.
North Port Passenger Terminal is a terminal located in Pier 4, Manila North Harbor, Port of Manila.
 On June 11, 2012, The Manila North Harbour Port Inc. hosted the groundbreaking ceremony of the terminal aimed to improve sea travel in the country.
 On May 10, 2013, the south side if the terminal soft-opened to accommodate the passengers of 2GO Ferry.
 It was formally opened on October 9, 2013.
 It can accommodate 2-3 million passengers per year greater than the old terminal which only supports about 1.5 million passengers.
The Port Charlotte Town Center is a mall located in Port Charlotte, Florida.
 Many of the shoppers are from Port Charlotte and bordering towns such as North Port, Englewood, and Punta Gorda.
 The anchor stores include Beall's, Dillard's, JCPenney, Macy's, Regal Cinemas, and Sears.
Sarasota County is a county located in the U.S. state of Florida.
 As of the 2010 census, the population was 379,448.
 Its county seat is Sarasota, and its largest city is North Port.
 A majority (over 60%) of Sarasota County's residents live in unincorporated areas outside of its four municipalities.
The Port of Taicang North Port Expressway (), designated S80, is a 15.411 km provincial expressway in the county-level city of Taicang, Jiangsu, China that connects the G15 Shenyang–Haikou Expressway, a major north-south expressway running through the city, with the Port of Taicang.
 It is one of two expressways that connect the port with the rest of the expressway network, the other one being the S81 Port of Taicang South Port Expressway.
 It opened on 8 October 2013.
Little Salt Spring is an archaeological and paleontological site in North Port, Florida, United States.
 It is located directly off Price Boulevard between US 41 and I-75 adjacent to Heron Creek Middle School in the city of North Port.
 On July 10, 1979, it was added to the National Register of Historic Places.
Florida's 16th congressional district is an electoral district for the U.S. Congress and was reassigned in 2012, effective January 2013, to western Manatee County, Florida and Sarasota County.
 The district stretches from Bradenton, the County Seat, in Manatee County to North Port, in Sarasota County, the county's youngest and most populous incorporated city.
 The city of Sarasota is the County Seat of Sarasota County.
North Port is a city in southern Sarasota County, Florida, United States.
 The population was 57,357 at the 2010 census.
 It is part of the North Port–Bradenton–Sarasota Metropolitan Statistical Area.
 It was originally developed by General Development Corporation as the northern or Sarasota County part of its Port Charlotte development.
 GDC dubbed it "North Port Charlotte", and it was incorporated under that name through a special act of the Florida Legislature in 1959.
 By referendum in 1974 the city's residents approved a change to simply North Port to proclaim its separate identity.
Sarasota ( ) is a city in Sarasota County on the southwestern coast of the U.S. state of Florida.
 The area is renowned for its cultural and environmental amenities, beaches, resorts, and the Sarasota School of Architecture.
 The city is at the southern end of the Tampa Bay Area, north of Fort Myers and Punta Gorda.
 Its official limits include Sarasota Bay and several barrier islands between the bay and the Gulf of Mexico.
 According to the U.S. Census Bureau, in 2013 Sarasota had a population of 53,326.
 In 1986 it became designated as a certified local government.
 Sarasota is a principal city of the Sarasota metropolitan area, and is the seat of Sarasota County.