Maps and GIS · October 7, 2026
County Parcel Shapefile: How to Download Free Parcel Data
Where to download a free county parcel shapefile: county open data sites, statewide parcel layers, records requests, and how to open the files.
A county parcel shapefile is the parcel map in raw form: every lot drawn as a shape, with a table behind it that holds the parcel number and usually the owner, address, acreage and tax details. The online viewer lets you look; the data file lets you work. With it you can map a whole township in free software, count lots by size, line parcels up against flood zones, or plan a mailing or field route. Plenty of counties give the file away. Others post it on a state portal, sell it for a fee, or hand it over only on request. This guide covers where to look first, the file types you will run into, how to open them for free, and what the data can and cannot tell you.
What a parcel data file contains
Two things travel together in a parcel download. The first is geometry: one polygon per tax parcel, placed on the map with real-world coordinates. The second is the attribute table, one row per polygon. Field names and contents differ from county to county, but you will often find:
- Parcel ID (also called PIN, APN or tax map number). This is the key that ties the shape to the assessor’s records. See what an APN number is.
- Owner name and mailing address, though some states and counties leave these out of the public file.
- Site address, land use or property class code, and the school or tax district.
- Acreage, sometimes two versions: the acreage the GIS calculates from the shape and the deeded or assessed acreage. They rarely match exactly.
- Assessed or market value, sale date and price, and deed book and page in some counties.
- Subdivision, lot and block for parcels in a platted subdivision.
If the download has shapes but almost no attributes, the county may keep the tax roll as a separate table that you join by parcel ID.
File formats you will see
- Shapefile. The most common choice, usually delivered as a ZIP. Inside are several files with the same name and different endings, at least .shp (the shapes), .shx (an index) and .dbf (the table), plus .prj (the coordinate system). Keep them together in one folder. Shapefiles cap field names at 10 characters, which is why columns get odd names like OWNNAME1 or ACRES_CALC.
- File geodatabase (.gdb). A folder-based format from Esri that holds larger datasets and longer field names. Free tools such as QGIS can read it.
- GeoJSON. A single text file that web maps and many programs open directly. Handy for small areas, but large counties make very big files.
- KML or KMZ. The Google Earth format. Good for viewing, less handy for analysis.
- CSV or Excel. A table only. Useful for the tax roll, but it will not draw lot lines unless it carries coordinates.
Where to download parcel data for free
1. The county GIS or open data site
Start with the county. Look on the GIS department’s page, or the assessor’s, for links labeled Open Data, GIS Data, Data Downloads or Data Hub. Many counties run an ArcGIS Hub site where each layer has its own page and a Download button offering shapefile, CSV, KML and GeoJSON versions. Search the site for “parcels,” “tax parcels” or “cadastral.” If you are not sure where your county keeps its GIS, find it in the Platbookmapper county map directory and follow the link to its viewer; the data page is often one menu away.
2. The parcel viewer itself
Some county viewers include an extract or export tool that lets you draw a box and download the parcels inside it. Many others are view-only. If yours only prints maps, the guides on printing and exporting from a parcel viewer and downloading a county parcel map as a PDF cover what you can still get out of it.
3. Your state’s GIS clearinghouse
A growing number of states gather parcels from every county into one statewide layer. Wisconsin, Massachusetts, Montana, Utah and North Carolina are well-known examples, and other states offer partial coverage or county-by-county links. Search your state’s name with “statewide parcels” or “GIS clearinghouse.” Statewide sets are convenient because the fields are standardized, but they may lag a year or more behind the county’s own file, and they sometimes drop owner names. Our state pages group the county map links by state, which helps when you are comparing a state layer with the county’s own.
4. Regional planning agencies and cities
Metro planning councils, regional commissions and large cities often publish parcel layers for their area, sometimes with extra fields such as zoning or land use. They are worth checking when the county site comes up empty.
5. Ask the county
If nothing is posted, email or call the GIS office or the assessor and ask for the parcel layer in shapefile or geodatabase format. Some send it free. Others charge a data fee, ask you to sign a use agreement, or point you to the state’s public records law. Rules on whether a county can charge for GIS data, and how much, differ by state. Say what format and area you need, and ask how current the file is.
Commercial companies also sell nationwide parcel data that has been gathered and cleaned up into a single format. That can save a lot of time when you need many counties at once, but it is a paid product, not a free download.
How to open a parcel shapefile for free
- QGIS. Free, open-source desktop GIS for Windows, Mac and Linux. Drag the .shp file or the .gdb folder onto the map, then open the attribute table to sort, filter or select parcels. It can also measure, label lots and export a smaller area.
- Google Earth Pro. The free desktop version can import a shapefile through the File menu and draw the parcels over aerial imagery. It works best with a small clip of the county rather than every parcel at once.
- A spreadsheet. To read just the table, open the .dbf file in LibreOffice Calc, or download the CSV version if the county offers one.
Why the lines might land in the wrong place
County data is often stored in a state plane coordinate system measured in feet rather than in latitude and longitude. The .prj file tells your software which system it is. If that file is missing or you open the shapes without it, the parcels can land hundreds of miles from where they belong, appear stretched, or not show up at all. Keep the .prj with the other files, or ask the county which projection the data uses. QGIS can then reproject the layer so it lines up with aerial photos and other maps.
Matching the shapes to the tax roll
When owner and value details live in a separate table, join it to the shapes by parcel ID. The tricky part is formatting: one file may write the number with dashes and the other without, or one may drop leading zeros. Clean both columns to the same pattern before joining. Parcel numbers can also change after splits and combinations, as explained in do parcel numbers change, so a few unmatched rows are normal.
What parcel data cannot do
GIS parcel lines are drawn from deeds, plats and old tax maps to show roughly where each lot lies. They are not a survey. Lines can be shifted several feet or more, especially in rural areas, and acreage calculated from the shape can differ from the deed. That is why GIS lot lines move between updates. Use the data for research, planning and mapping, and rely on a licensed surveyor for anything involving a boundary, a fence or a building line. Plat map vs a boundary survey explains the difference. Also read the county’s disclaimer or license: some restrict commercial use or reselling, and most say the data comes with no guarantee.
County parcel shapefile FAQ
Where can I download a county parcel shapefile?
Start with the county GIS or assessor website and look for an open data, GIS data or downloads page. If nothing is posted, check your state GIS clearinghouse for a statewide parcel layer, then ask the county GIS office directly.
Is county parcel data free?
Often, but not always. Many counties post parcel files at no charge. Others charge a data fee, require a use agreement, or release the file only through a records request. State law affects what a county may charge.
What program opens a parcel shapefile?
QGIS is a free desktop GIS that opens shapefiles, file geodatabases and GeoJSON. Google Earth Pro can import a shapefile for viewing over aerial imagery, and LibreOffice Calc can open the .dbf attribute table.
Why does a shapefile come with so many files?
A shapefile is a set of files that share one name. The .shp holds the shapes, the .shx is an index, the .dbf holds the attribute table and the .prj records the coordinate system. Keep them together or the layer may not open or line up.
Does parcel GIS data show exact property lines?
No. GIS parcel lines are compiled from deeds, plats and tax maps for reference. They can be off by several feet or more. Only a licensed land surveyor can locate a legal boundary.
Why are owner names missing from my parcel download?
Some states and counties leave owner names or mailing addresses out of public GIS files for privacy, or keep them in a separate tax roll table. Check the county's data notes or ask the assessor.