Carroll County GIS Maps

Carroll 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.

Carroll County Parcels

Carroll County has 68,824 mapped parcels covering 277,486 acres. The median assessed value is $403,000. The median lot size is 0.68 acres. 4,145 parcels are 10 acres or larger. Residential accounts for 81.7% of parcels. Agricultural follows at 5.7% and residential condominiums at 3.3%. Of the parcels with a recorded build year, half were built in 1985 or earlier. The records carry 59,974 distinct owner names. About 2% of parcels list an owner mailing address outside Maryland. Owner names, mailing addresses, assessed values and lot sizes are on nearly every parcel. Site addresses reach 90.1%. Browse the interactive Carroll County Parcel viewer here.

Carroll County Parcel Data Coverage

Field coverage measured across all Carroll County parcel records. Download free sample data here.

Carroll County Population

Carroll County had 172,891 residents in 2020. That was 3.4% higher than in 2010. Carroll County added 21,994 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 386 people per square mile. Some of the county's most populated postal areas include Sykesville, Westminster and Westminster.

Population Trend in Carroll County MD

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

Carroll County Zip Codes

Carroll County has 9 zip codes. Some of the county's most populated zip codes include Sykesville (21784), Westminster (21157) and Westminster (21158). Sykesville is the largest zip by population, with about 40,028 residents or 23% of the county total. Together, the three largest zips account for about 58% of all county residents based on 2020 population estimates.

Most Populated Zip Codes in Carroll County MD

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

Carroll County Demographics

Carroll County has a median age of 41.3, which makes the county a little older than Maryland overall. About 22% of residents are under 18, while 17.6% 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 29.8% of the population, which points to a solid working-age base. About 39.7% of adults have a bachelor's degree or higher, above the statewide figure of 42.7%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.

Key Demographics for Carroll County MD

Carroll County School Districts

Carroll County is served by 1 public school district with 26,141 students enrolled in 2024. Several larger districts account for a substantial share of students across the county map area. Those three districts account for about 100% of public school enrollment in the map area. Total enrollment has grown modestly since 2017 across the districts shown on the county map.

Largest School Districts by Enrollment in Carroll County MD

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

Carroll County Housing & Real Estate

Carroll County has a median home value of $406,400 and a median gross rent of $1,370. About 84% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the Maryland median, while rents come in below the state average. In March 2026, the median listing price was $502,450 and homes spent about 26 days on the market.

Businesses in Carroll County, MD

Carroll County has 6,384 business listings across 725 categories. The largest categories in Carroll County business listings are Churches & Religious Organizations (166, 2.6%), Contractors (147, 2.3%), and Real Estate Agents (143, 2.2%). The full Carroll County business listings dataset includes names, categories, addresses and contact details where available. Carroll County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.

Top Business Categories in Carroll County, MD

Carroll County Business Listings

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

Carroll County Basemaps

Carroll 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 Maryland — explore the full structure before you buy.