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Your County GIS Map: How to Find It, Search It, and Read What It Tells You

Our findings from across the industry to help our fellow land investors

What GIS actually is

24/02/2024

GIS stands for Geographic Information System. In practice, for a landowner, it means the interactive map your county publishes showing every parcel it assesses — boundaries, parcel numbers, acreage, ownership and usually a stack of extra layers like zoning, flood zones and aerial photography.

It exists because the county needs it to collect property tax. That it is useful to you is a side effect, which is why it is free..

Finding your county's map

There is no national site. Each county runs its own, so the reliable route is a search:

[county name] [state] GIS

[county name] [state] parcel viewer

[county name] [state] property search

You are looking for a result on a .gov or .us domain, or a *.arcgis.com address the county links to. Names vary, Parcel Viewer, Property Search, Land Records, Map Gallery, Beacon, qPublic, and the county's own branded portal are all common.

Two notes that save time. Some rural counties contract this out to a regional or statewide service, so if your county's own site looks bare, search for the state's parcel viewer instead. And a handful of counties genuinely have nothing usable online in that case the assessor's office will look it up over the phone.

Searching it

Almost every viewer offers the same three ways in:

By parcel number (APN). Most precise, if you have it. Enter it exactly as the county writes it, punctuation included.

By address. Works when the parcel has one. Plenty of vacant land does not, so do not conclude your parcel is missing if an address search fails.

By owner name. The one most landowners should use. Search your own surname and the county will list every parcel it has under it. This is also how you find land you inherited and were never told the details of.

If none of those work, you can usually just navigate the map: zoom to the rough area, switch on aerial imagery, and click the parcel. The panel that opens gives you everything the county holds.

What to turn on, and what it tells you

The layers list is where the real value is. The ones worth checking:

Parcels. Boundaries and parcel numbers. Click yours and note the APN, the deeded acreage and the legal description.

Aerial imagery. What is actually on the ground trees, clearings, structures, tracks, water. Check the imagery date; some counties fly every year, some every five.

Roads and right-of-way. Whether your boundary genuinely meets a public road. This is the layer that answers the access question, and it is worth zooming right in. Parcels that appear to touch a road often stop a few feet short.

Zoning. What the county permits on the parcel. Drives value more than almost anything else.

Flood zones. Many counties overlay FEMA data directly. Otherwise use FEMA's own map service.

Topography or contours. Steepness. A parcel that is flat is worth more than one that is not, because building on a slope costs more.

Soils. Present in many rural counties. Relevant because soil type is a strong hint at whether a septic system will pass a perc test.

Measuring things

Most viewers include a measure tool, usually a ruler or polygon icon. You can measure road frontage, the distance to the nearest utility pole, or draw a rough polygon to check the usable area once you exclude a creek or a slope.

This is genuinely useful for answering "how much of this is actually buildable", which is the question that sets your price.

Getting it out

Look for print, export or share. A PDF or a shared link of your parcel with the aerial and parcel layers on is a good thing to have when you talk to a buyer — it saves them a step and it shows you know what you own.

What GIS is not

This matters, and people get caught by it.

GIS boundaries are not survey-grade. They are digitised from deeds and plats, and they can be off by several feet — sometimes considerably more on old rural parcels. Only a licensed survey establishes where your corners legally are. If a boundary question actually matters to a transaction, GIS narrows it down; it does not settle it.

GIS acreage is not always the deeded acreage. The map's calculated figure and the deed's figure often differ slightly. The deed governs.

The data can be stale. Ownership updates lag recording, sometimes by months. If you recently inherited a parcel, the map may still show the deceased owner — that is normal and does not mean anything is wrong.

Layers are informational, not determinations. A wetland layer is a screening tool, not a delineation. A flood layer is a copy of FEMA's map, not a formal determination.