Barnwell County GIS Maps
Home » South Carolina » Barnwell County
Barnwell County, South Carolina, has 20,589 residents and covers 548.4 square miles. The population declined 9% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Barnwell County is 45011.
Barnwell is the county's largest population center. Barnwell County also includes 4 zip codes, 1 public school district and 14 municipalities. Those boundaries help explain why population, schools, and housing can look different from one part of the county to another. The map below shows how those county lines, zip codes, and school districts fit together, and the sections that follow use that same geography to show population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers and sample data. Paid packages add full layers, analytics and database files.
Barnwell County Trends
- Population
- 20,589▾
- Median Home Value
- $97,200▴
- K-12 Enrollment
- 0—
County analytics dashboards with historical trends & projections included in package downloads.
Free starter access previews county maps, lightweight GIS, and sample data. Paid packages unlock full GIS layers, analytics, and database files.
Barnwell County Maps
The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.
County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.
Barnwell County Population
Barnwell County had 20,589 residents in 2020. That was 9% lower than in 2010. Barnwell County had 2,889 fewer people in 2020 than it did in 2000, which points to a long-term population decline. The county is fairly spread out, with about 38 people per square mile. Some of the county's most populated postal areas include Barnwell, Williston and Blackville.
Population Trend in Barnwell County SC
Barnwell County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Barnwell County Zip Codes
Barnwell County has 4 zip codes. Some of the county's most populated zip codes include Barnwell (29812), Williston (29853) and Blackville (29817). Barnwell is the largest zip by population, with about 11,107 residents or 54% of the county total. Together, the three largest zips account for about 104% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Barnwell County SC
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 29812 | Barnwell | 11,107 | ▾ -6.4% |
| 29853 | Williston | 6,161 | ▾ -6.4% |
| 29817 | Blackville | 4,154 | ▾ -15.4% |
| 29826 | Elko | 136 | ▾ -17.1% |
| Download all zip code data | |||
Barnwell County Zip Code populations and trends per most recent census data.
Barnwell County Demographics
Barnwell County has a median age of 40.7, which is close to the South Carolina average. About 23.7% of residents are under 18, while 18.9% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 29% of the population, which points to a solid working-age base. About 12.8% of adults have a bachelor's degree or higher, above the statewide figure of 31.5%. The county has a more diverse population mix, with no single race or ethnicity accounting for all of the local story.
Key Demographics for Barnwell County SC
Median Age
40.7
Under 18
23.7%
Age 65+
18.9%
Bachelor's+
12.8%
Barnwell County School Districts
Barnwell County is served by a network of public school districts across the map area. Several larger districts account for a substantial share of students across the county map area. A few larger districts account for much of the county-serving student population. Enrollment trends are not available yet for the districts shown on the county map.
Barnwell County Housing & Real Estate
Barnwell County has a median home value of $97,200 and a median gross rent of $695. About 71% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the South Carolina median, while rents come in below the state average. In March 2026, the median listing price was $267,900 and homes spent about 180 days on the market.
Barnwell County Housing Mix
Barnwell County housing mix: owner, renter and vacant units.
Barnwell County Housing Trends
Barnwell County median home value and rent trend (last 5 years).
Businesses in Barnwell County, SC
Barnwell County has 774 business listings across 258 categories. The largest categories in Barnwell County business listings are Churches & Religious Organizations (50, 6.5%), Baptist Church (43, 5.6%), and Gas Stations (17, 2.2%). The full Barnwell County business listings dataset includes names, categories, addresses and contact details where available. Barnwell County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Barnwell County, SC
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 50 | 6.5% |
| Baptist Church | 43 | 5.6% |
| Gas Stations | 17 | 2.2% |
| Beauty Salons | 13 | 1.7% |
| Pizza Restaurants | 13 | 1.7% |
| Farm | 12 | 1.6% |
| Discount Store | 12 | 1.6% |
| Hair Salons | 12 | 1.6% |
| Landmark And Historical Building | 10 | 1.3% |
| Elementary School | 10 | 1.3% |
Barnwell County Business Listings
| Business | Category | City |
|---|---|---|
| Axis I Center of Barnwell | Abuse And Addiction Treatment | Barnwell |
| Console Classix | Advertising Agency | Williston |
| Black's Cylinder Repair | Agricultural Service | Barnwell |
| Kem's Power Pro | Agriculture | Blackville |
| Barnwell Regional Airport | Airport | Barnwell |
| Medshore Medic 94 | Ambulance And Ems Services | Hilda |
| Hilda Fryebaby's | American Restaurants | Hilda |
| St. James Anglican | Anglican Church | Blackville |
| The Animal Advocates | Animal Rescue Service | Barnwell |
| Barnwell County Animal Shelter | Animal Shelters | Barnwell |
| Download Barnwell County business listings | ||
Barnwell County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Barnwell County Basemaps
Barnwell County map and data packages include a set of useful basemaps to help you get started quickly. These include a custom light grey canvas, USGS topo, imagery and other reference layers that make it easier to build clear, meaningful county maps using the included GIS layers, your own data or both. Pre-rendered map tiles for the light grey basemap are included so you can use them offline or host them on your own CDN.
Get the Full Barnwell County Data Package
This page shows a preview of what's included in the Barnwell County data package. The full package gives you a ready-to-use county data system with GIS layers, historical data, maps, database files and planning tools that save hours of manual data gathering, cleanup and joins. Everything is organized to help you skip data wrangling and start analysis faster.
- 20+ GIS layers for zip codes, school districts, roads, water, boundaries and more
- Historical county demographics, housing, income and trend data
- ZIP code population files and school district enrollment history
- Database files, markdowns, AI-ready prompts and documentation
- Map exports in PNG, JPEG, PDF, SVG and GeoTIFF formats
- Offline-ready data explorer, map and analytics tools
Paid packages support commercial use, client work, and derived outputs. Some package contents may include source-specific attribution or provider notices. See Licensing & Data Source Notices.
One-time · instant download · 30-day refund guarantee · See full package details
Preview a Live Package Demo
See exactly what is included in a county data package. Inspect how files are organized, the interactive data explorer and how maps and analytics are laid out. The demo loads a real sample package from South Carolina — explore the full structure before you buy.
No email or download required. Opens in a preview window on this page.
Nearby Counties
Browse county data pages for the counties that border Barnwell County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.