Blog · September 24, 2026 · Arizona
Pima County, Arizona GIS Parcel Map Guide
With PimaMaps, Pima County’s free parcel viewer, you can find a Tucson lot or a five-acre desert parcel by address or book-map-parcel number, check the lines and washes, and trace the recorded plat.
Main page: Pima County, AZ GIS & Parcel Viewer (official map link, Pima County facts and neighboring maps).
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Pima County covers a huge slice of southern Arizona — the Tucson basin, sky-island mountain ranges, and a long run of Sonoran Desert out to Ajo and the Mexican border. Whether you are checking a midtown Tucson bungalow or a five-acre desert parcel with saguaros and no power, the county’s PimaMaps portal is the official starting point.
PimaMaps and the county’s mapping tools
PimaMaps is Pima County’s public mapping portal. From its entry page you can open the county’s interactive map applications, which layer parcel boundaries, addresses, and imagery with planning and environmental data. The Pima County Assessor maintains the parcel and valuation records behind those parcels, and the Recorder holds deeds and plats.
We link to it from the Pima County listing in our Arizona directory, and you can also select the county on the Platbookmapper national map.
Search by address, owner or book-map-parcel number
Arizona assessor parcel numbers follow a book-map-parcel pattern — three groups of digits that point to the assessor’s map books. You will find the number on tax bills, listings, and deeds. It is the quickest way to land on an unaddressed desert parcel, where address search often fails. For more on identifiers, see our APN and PIN explainer.
A quick PimaMaps lookup
- Open PimaMaps and choose the main interactive map.
- Search by address or parcel number, or zoom in and click the parcel.
- Read the parcel information: owner, parcel number, acreage, and links to assessor details.
- Switch to aerial imagery to see washes, dirt roads, and neighboring structures.
- Explore the layer list for zoning, floodplain, and jurisdiction boundaries.
- Save the parcel number and a dated screenshot.
How to find property lines in Pima County
- Find the parcel in PimaMaps and note the book-map-parcel number and legal description.
- Pull the recorded subdivision plat, or the survey behind a lot split, from the Pima County Recorder.
- On raw desert land, look for the corner monuments, often rebar with a plastic cap. Mesquite and creosote can hide them.
- Before you drill a well, run a fence or place a home, hire a surveyor.
A very big county with a lot of non-private land
Tucson is the county seat, surrounded by Marana to the northwest, Oro Valley to the north, Sahuarita and Green Valley to the south, and the small city of South Tucson inside the Tucson footprint. Vail, Catalina Foothills, and Picture Rocks are unincorporated communities. To the west, much of the county is Tohono O’odham Nation land, and there are large blocks of federal land, including Saguaro National Park, Organ Pipe Cactus National Monument, and national forest in the mountain ranges. On the map, those big blocks are not part of the private land market, so it helps to recognize them early.
Pima County acreage map: desert parcels, washes and access
Washes can flood fast
Dry washes crisscross the Tucson basin, and they carry real floodwater during monsoon storms. The Pima County Regional Flood Control District regulates floodplains and riparian habitat, and parcels crossed by a wash may have limited buildable area. Check the floodplain layers and study the aerial for drainage patterns; our guide to flood zones in parcel viewers explains what the layers mean.
Legal access
Outlying parcels are often reached by unpaved roads. A road visible on the aerial is not automatically a public road or a recorded easement. Before you buy, confirm legal access through a title company. See road frontage and right-of-way for what to look for.
Water and power
Water availability is a serious question across Arizona. Ask whether the parcel is served by a water provider or would rely on a well, and find out how far the nearest power line is. These costs can exceed the price of cheap desert land.
Pima County plat maps: free records, no printed plat book
Pima County has no commercial owner-name plat book. PimaMaps is the free ownership map, and recorded subdivision plats and surveys come from the Recorder. When you screen land or look for a place to hunt, ownership status matters as much as acreage. Much of the county is state trust land, federal land or tribal land. Recreation on Arizona state trust land generally requires a permit from the Arizona State Land Department. On private land, click the parcel for the owner of record and ask first. Keep an Arizona atlas and gazetteer in the truck when you’re checking dirt-road parcels.
Is PimaMaps accurate enough for a desert boundary?
It’s good enough to find the parcel and judge its setting. It isn’t good enough to place a fence or a well. The assessor’s parcel lines are compiled from recorded maps and deeds, and in the open desert, lot splits and old section-based descriptions can leave the drawn line some distance from the monuments. Deeds, plats and easements are recorded with the Pima County Recorder, and an Arizona registered land surveyor sets corners. For the Phoenix metro, see our Maricopa County parcel map guide. The Arizona county GIS hub lists every county’s official viewer.
Mining, military, and the university
The University of Arizona is Tucson’s anchor, and Davis-Monthan Air Force Base — known for its aircraft “boneyard” — sits on the southeast side. Large copper mines operate south of Tucson near Green Valley and Sahuarita, and pecan orchards line parts of the Santa Cruz River valley. Tourism, healthcare, aerospace, and retirement communities round out the economy. Each shapes the parcel map: mine holdings and base land appear as large ownerships, while retirement areas show dense, regular lots.
Desert research tips, and what to do when PimaMaps won’t load
- Look at the parcel on imagery from more than one year, if the viewer allows, to see how drainage and roads have changed.
- Check neighboring parcels for owners that hint at land status — state trust land, federal agencies, or the Nation.
- For large rural tracts, measure the distance to the nearest paved road and power line before you get excited about the price.
If PimaMaps opens to a blank screen, go back to the portal page and relaunch the interactive map, allow pop-ups, and use a desktop browser. You can always reach the current entry point from the Pima County row in our Arizona directory.
Who uses PimaMaps
Snowbirds and retirees shopping Green Valley and Oro Valley, university-area landlords, builders tracking new subdivisions in Marana and Vail, off-grid land buyers, surveyors, engineers, and title examiners. Residents also use the maps to check zoning around a proposed project nearby.
Frequently asked questions
What is PimaMaps?
PimaMaps is Pima County’s public mapping portal. It opens interactive maps with parcel boundaries, addresses, imagery, and planning and environmental layers.
How are Pima County parcel numbers formatted?
Arizona assessor parcel numbers follow a book-map-parcel pattern of three groups of digits. Copy the number exactly from a tax bill or deed.
How do I find out who owns a piece of land with no address?
Zoom to the parcel in PimaMaps and click it. The parcel number and owner information appear even when there is no street address.
Why do washes matter on a desert parcel?
Washes carry fast floodwater during monsoon storms. Floodplain and riparian rules can limit building near them.
Open the official Pima County GIS viewer Pima County in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey — especially for fences, setbacks, or boundary disputes.