Hamlin County GIS Maps

Hamlin 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.

Hamlin County Population

Hamlin County had 6,164 residents in 2020. That was 4.4% higher than in 2010. Hamlin County added 624 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 12 people per square mile. Some of the county's most populated postal areas include Castlewood, Lake Norden and Hayti.

Population Trend in Hamlin County SD

Hamlin County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.

Hamlin County Zip Codes

Hamlin County has 5 zip codes. Some of the county's most populated zip codes include Castlewood (57223), Lake Norden (57248) and Hayti (57241). Castlewood is the largest zip by population, with about 1,437 residents or 23% of the county total. Together, the three largest zips account for about 60% of all county residents based on 2020 population estimates.

Most Populated Zip Codes in Hamlin County SD

Hamlin County Zip Code populations and trends per most recent census data.

Hamlin County Demographics

Hamlin County has a median age of 32.5, which makes the county a little younger than South Dakota overall. About 33.2% of residents are under 18, while 14.2% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is Under 18 at about 33.2% of the population, which suggests the county has a notable share of children and family households. About 24.4% of adults have a bachelor's degree or higher, above the statewide figure of 31.1%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.

Key Demographics for Hamlin County SD

Hamlin County School Districts

Hamlin County is served by 5 public school districts with 5,331 students enrolled in 2024. The largest districts on the county map are Watertown 14-4, Hamlin 28-3 and Castlewood 28-1. Those three districts account for about 91% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, but it is slightly lower than it was in 2017.

Largest School Districts by Enrollment in Hamlin County SD

Hamlin County school district enrollment and trends per most recent NCES reporting data.

Hamlin County Housing & Real Estate

Hamlin County has a median home value of $207,700 and a median gross rent of $769. About 82% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the South Dakota median, while rents come in below the state average. In March 2026, the median listing price was $399,000 and homes spent about 58 days on the market.

Businesses in Hamlin County, SD

Hamlin County has 198 business listings across 102 categories. The largest categories in Hamlin County business listings are Churches & Religious Organizations (11, 5.6%), Contractors (9, 4.5%), and Gas Stations (9, 4.5%). The full Hamlin County business listings dataset includes names, categories, addresses and contact details where available. Hamlin County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.

Top Business Categories in Hamlin County, SD

Hamlin County Business Listings

Hamlin County business listings sourced from Overture Maps. Includes locations with a high level of confidence.

Hamlin County Basemaps

Hamlin 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.

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 Dakota — explore the full structure before you buy.