GIS Data / Maps

The Assessor has established a policy to make office records as open and easy to obtain as possible.


Access a variety of GIS Applications by clicking on the left menu "GIS Applications" or on GIS Applications.

In-House Access

The office staff is knowledgeable and can answer most inquiries over the phone or by email. Two computers are available at the front counter for public access to records and Geographic Information Systems (GIS) data including:

  • Aerial Photography
  • Contours
  • Floodplain
  • Ownership Data
  • Parcel Lines
  • Roads
  • Subdivision Lot Lines and Text
  • Taxing Districts

Online Access

Property records are available online under the Personal Property and Real Estate Search. The Assessor’s Online GIS Services offers a Property Viewer that allows searches by:

  • Owner
  • Parcel ID
  • Property Address
  • Spatially Zooming to a Specific Area

If you are looking for more specific information it may require a visit to the office. Additional web applications can be found on the GIS Applications page including a Map Gallery for PDF maps.

For Purchase

The assessor’s data files (tax rolls) are available for purchase in digital format. Data can also be requested outside the scope of the Assessor’s responsibilities or beyond a reasonable expectation. 

The Assessor’s Office maintains a comprehensive GIS division whose duties are to:

  • Maintain property maps and taxing entity boundaries
  • Perform in-house analysis of data
  • Provide data on the website

As a benefit to the taxpayers and businesses; the division can perform reproducible maps and custom work including analysis when time allows. A fee may be charged to cover the cost of creating this data.

What Type of Map Do You Need?

Plot Plan or Site Plan (Code Enforcement (FKA Building Department))

The definition of a plot (site) plan is a plan showing the property boundary lines, building setback lines, and the location of a structure with distances to the property lines. Other elements include the location of North, driveway and road location, utilities, private well/septic, etc. The subtle difference between a plot plan and a site plan is that a plot plan is for a single residence or single building whereas a site plan encompasses a larger area; such as an industrial park, commercial development, or large subdivision.

The Assessor’s office does not have the authority to produce plot (site) plans that meet that definition. It is something a land surveyor or engineer creates. Code Enforcement (FKA Building Department) does not accept aerial maps any longer (March 18, 2021).

Plat Map or Subdivision Plat

Plat Maps or Subdivision Plat Maps are available from the Recorder of Deeds Department.

A plat map or subdivision plat is drawn by land surveyors and submitted to the Jefferson County planning division for approval. Once approved the plat map is recorded with the Recorder of Deeds. Plat maps or subdivision plats normally show subdivision boundaries, lots, lot numbers, building setback lines and easements. These items are not always provided on the plats. This is a true legal representation of the property.

Survey (Contracted Through a Land Surveyor)

A survey is researched, performed by, and drawn by land surveyors. A survey contains the legal description of a property including the bearings and distances (metes and bounds), and other items like building setbacks, easements, etc. Surveys are recorded with the Recorder of Deeds at the individual’s discretion; surveys are not required to be recorded with Jefferson County. A survey is a report of the results of a field survey performed by a licensed land surveyor and can be used to prove the legal boundaries of a property.

To find the true location of property lines; a survey or plat map/subdivision plat is required. All other maps are for taxing purposes only and cannot be used to locate property lines accurately.

Types of Maps the Assessor Provides

GIS Parcel Map (Property Map)

Aerial background with:

  • Lot Lines
  • Parcel Numbers
  • Property Lines
  • Road Names

Requests are accepted for contour lines (2 or 10 foot) and various years of aerials. Map sizes are 8 x 11, 24 x 24, and 36 x 36.

GIS Custom Map (Property Map)

Custom maps include data that may or may not be available on the GIS Parcel Map that is requested in such a way that the standard GIS Parcel Map is not applicable. 

Example: highlight parcels within 1 mile of subject parcel or city boundary map showing properties that have 10 or more acres.

Taxing District Maps (Countywide Map)

  • Ambulance
  • Fire
  • Municipalities
  • School
  • Special Road Districts

Political District Maps (Countywide Map)

  • County Council
  • Missouri House of Representatives
  • Missouri State Senate
  • Political Townships
  • U.S. Congressional Districts
  • Voting Precinct

Road Map (Countywide Map)

Road Map - Roads including major and minor with municipalities as reference.

Public Land Survey System & Locator Maps (Countywide Map)

Assessor Locator Grid maps and Public Land Survey System (PLSS) maps showing the location of township, range, surveys, and sections