Unfortunately, no agency, department or organization has the legal
responsibility to track and report parcel areas. Furthermore, no measurements
are exact. We can only do the best we can with available information of record
or have a surveyor make a determination based on all the facts and
If a parcel is in a subdivision, that parcel's subdivision plat map defines
the parcel's boundaries at the time of platting and is often the best source for
finding parcel area short of survey. See Parcel areas from
subdivision plat maps below. Some subdivision plat maps clearly specify
parcel areas and some don't. Those that don't show areas show only lot
dimensions and angles. When parcel area isn't specified on a plat map, a
surveyor (among others) could calculate the parcel's area from the dimension
information on the subdivision plat map.
It's possible that one or more surveys may have been done in your area of
interest. See Parcel areas from records of survey
The estimated parcel area on our website's parcel detail pages is calculated
from our interpretation of the parcel's boundaries as displayed on our maps.
Therefore, the area value is subject to errors inherent in any mapping process.
See Estimated parcel areas from GIS data below. If you
click on "Assessor Parcel Detail" on our parcel detail page the Assessor shows
"Land Measure" with the Assessor's estimate of the parcel's area for assessing
For parcels that are not in subdivisions, then the parcel area may be
estimated by the parcel's legal description on the deeds. Sometimes the legal
description includes the area and sometimes it doesn't.
The method for determining parcel areas depends on just how accurate you need
it. If the subdivision plat map, legal descriptions, existing surveys, and
online map estimates are not good enough for your needs, then you should hire a
surveyor. Even surveyors can disagree. Ultimately, if there was a parcel area or
boundary dispute it would be resolved in the courts.
Since we can never know exact parcel areas, we suggest quoting the source
along with the area such as:
- x.xx acres as taken from the Subdivision Plat Map.
- x.xx acres as calculated by ..... from subdivision plat map parcel
- x.xx acres as estimated on the Pima County GIS web site.
- x.xx acres as estimated on the Pima County Assessor's web site.
- x.xx acres as taken from the deed recorded at (docket/page or sequence
Parcel areas from subdivision plat maps
Estimated parcel areas from GIS data
- The parcel detail page for each parcel has "Parcel area" at
the very bottom of the page. You can get to a parcel detail page by drilling
down through Parcel Information Search
or by double-clicking on a parcel on one of our MapGuide maps.
- A somewhat more complex way to find parcel area is to select one or
more parcels on a MapGuide map and get a report. These reports show the
area for each selected parcel as well as the total area of all selected parcels.
To select one parcel, simply click on the parcel. You can then use
SHIFT-click to add more selected parcels. To remove a selected parcel, press
SHIFT and click on the parcel. See Selecting Map Features in the MapGuide Viewer Help for more but be sure to scroll down on the page to see the most
commonly used methods.
After selecting parcels on a MapGuide map, use one of these methods
to get selected parcel area(s):
- Use the "Map Tools & Map Info." (Windows Internet Explorer users only)
drop down at the top of MapGuide map and choose the "Calculate Area"
tool to get the area report.
- Use the "View Report" tool on the MapGuide map tool bar and then select
"Parcel Area and Values Report". You can also get to the
"Parcel Area and Values Report" by right-clicking in the map area, choose
"Reports" and then "Parcel Area and Values Report".
Parcel areas from records of survey
- Many completed surveys are recorded as "Records of Survey".
If a survey was done in your area of interest, you may be able to find the
document using the "Records of Survey" link on the City of Tucson DOT Maps and Records web site or from the Pima County Recorder's "Survey Map" recorded documents. If a
parcel is in a typical residential subdivison, then it's not likely there will
be a record of survey beyond the subdivision plat map itself unless a special
survey was done for some specific reason.
See the Tips and Help link at the top of
MapGuide maps for more help.