South Carolina's center of population is 2.4 mi (3.9 km) north of the State House in the city of Columbia.
According to the U.S. Census Bureau, as of 2006, South Carolina has an estimated population of 4,321,249, which is an increase of 74,316, or 1.7%, from the prior year and an increase of 309,237, or 7.7%, since the year 2000. This includes a natural increase since the last census of 97,715 people (that is 295,425 births minus 197,710 deaths) and an increase due to net migration of 151,485 people into the state. Immigration from outside the United States resulted in a net increase of 36,401 people, and migration within the country produced a net increase of 115,084 people. Based on the 2000 Census South Carolina was ranked 21st in population density with just over 133 persons per sq. mi.
According to the University of South Carolina's Arnold School of Public Health, Consortium for Latino Immigration Studies, South Carolina's foreign-born population grew faster than any other state between 2000-2005. The Consortium reports that the number of Hispanics in South Carolina is greatly undercounted by census enumerators and may be more than 400,000.
The five largest ancestry groups in South Carolina are African American (29.5%), American (13.9%), English (8.4%), German (8.4%) and Irish (7.9%). For most of South Carolina's history, African slaves, and then their descendants, made up a majority of the state's population. Whites became a majority in the early 20th century, when tens of thousands of blacks moved north in the Great Migration. Most of the African-American population lives in the Lowcountry (especially the inland Lowcountry) and the Midlands; areas where cotton, rice, and indigo plantations once dominated the landscape. 6.6% of South Carolina's population were reported as under 5 years old, 25.2% under 18, and 12.1% were 65 or older. Females made up approximately 51.4% of the population in 2000.
South Carolina Office of Research & Statistics (Projection) Census Bureau(Estimates)
Charleston
Columbia
Greenville
South Carolina's cities are actually much larger than their city population counts suggest. South Carolina law makes it difficult to annex unincorported areas into the city limits, so city proper populations look smaller than they actually are. For example, Spartanburg and Myrtle Beach have populations over 180,000, and their metropolitan areas are much larger. Anderson city population is smaller than Sumter, but the Anderson area is much larger. The Sumter area population is under 100,000, but Anderson's is over 120,000, while Anderson County's population is nearing 200,000.
Columbia, Charleston, and Greenville all area have "urbanized area" populations of around 400-420,000, while their metro area populations are all over 700,000. If Greenville-Spartanburg is considered one metro, as it was in the past before being split, its population is over 1 million. Similarly, Columbia's MSA population would top 1 million if the Sumter Metropolitan and Orangeburg Micropolitan areas were added.
South Carolina, like most other Southern states, has a Protestant Christian majority, and a lower percentage of non-religious people than the national average. The religious affiliations of the people of South Carolina are as follows:
Sephardic Jews have lived in the state for more than 300 years, [4] [5] [6] especially in and around Charleston [7]. Until about 1830, South Carolina had the largest population of Jews in North America. Many of South Carolina's Jews have assimilated into Christian society, shrinking Judaism down to less than 1% of the total religious makeup. In addition, Roman Catholicism is growing in South Carolina due to immigration from the North.
Major interstate highways passing through the state include: I-20 which runs from Florence in the east through Columbia to the southwestern border near Aiken; I-26 which runs from Charleston in the southeast through Columbia to Spartanburg and the northern border in Spartanburg County; I-77 which runs from York County in the north to Columbia; I-85 which runs from Cherokee County in the north through Spartanburg and Greenville to the southwestern border in Oconee County; I-385 which runs from Greenville and intersects with I-26 near Clinton; and I-95 which runs from the northeastern border in Dillon County to Florence and on to the southern border in Jasper County.
In March 2008, "The American State Litter Scorecard," presented at the American Society for Public Administration conference, rated South Carolina a nationally "Worst" state for removing litter from public properties such as highways. The state has an extremely high fatality rate from litter/debris-related vehicle accidents, according to National Highway Traffic Safety Administration data.
Amtrak operates four passenger routes in South Carolina: the Crescent, the Palmetto, the Silver Meteor, and the Silver Star. The Crescent route serves the Upstate cities, the Silver Star serves the Midlands cities, and the Palmetto and Silver Meteor routes serve the Lowcountry cities.
There are six significant airports in South Carolina, all of which act at regional airport hubs. The busiest by passenger volume is Charleston International Airport. Just across the border in North Carolina is Charlotte/Douglas International Airport, the 30th busiest airport in the world, in terms of passengers.