GIS Department

Lyon County operates a Geographic Information System (GIS) to provide current and accurate geospatial (map) information to County departments, the general public and other entities. We seek to ensure that Lyon County residents and decision makers have access to geographic information that is complete, timely, accurate, and reliable. We promote the use of GIS and related technologies to more effectively and efficiently address problems, develop plans, and manage the natural, cultural, economic, and infrastructure resources of the county. Lyon County is implementing GIS to streamline county operations and to make County data and records available to the citizens of Lyon County. GIS Department Responsibilities:

  • Maintain and create geospatial information
  • Maintain Lyon County Parcel data
  • Rural Address assignment and E9-1-1 System maintenance
  • Maintain GIS Interactive Mapping Sites
  • Hard Copy map production
  • Platbook creation and maintenance

GIS Data Requests & Policies

These attachements contain information about purchasing Lyon County GIS data and GIS department policies.

If you would like to purchase GIS Data from Lyon County you must complete the GIS Cooperative Agreement and send it by mail or email to the County GIS Coordinator

Lyon County E9-1-1 Rural Addressing Information

Lyon County E9-1-1 Contact Information:

E9-1-1 Contact: Mark Volz
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Phone: (507) 532-8218
Fax: (507) 532-8217
Address: Lyon County GIS Department
504 Fairgrounds Rd
Marshall, MN 56258


New E9-1-1 Address Sign Requests:  Lyon County uses GIS to assign and maintain rural addresses. Addresses are assigned using GIS tools that interpolate the address based on the driveway location along the road. Please complete the E-9-1-1 Address Work Request Form below and send it to the E9-1-1 Coordinator to get an E9-1-1 Address.


Lyon County E9-1-1 City Address Notification

Dear City Administrator,


This letter is to solicit your assistance in providing new addresses or address changes that you may have in your community. As you know, assigning of names and addresses of new residences or new streets, etc. are all the responsibility of the city.

This information needs to be shared as soon as possible with Lyon County Public Works, GIS department. There will be a fillable form on the Lyon County Public Works website by April 15, 2015.

The county GIS department then shares this information with the Lyon County PSAP (Public Safety Answering Point) so that the 911 data base can be updated.

If these new addresses, streets, etc. do not get passed on to Lyon County GIS it does not get into the 911 system.

I am sure you can understand the importance of this information getting to the PSAP. As it is now, if a landline call is made from a residence, the computer will plot it out at that address and it will attach a name, who the ambulance and fire and law enforcement providers are along with the address. This is extremely important life and safety issue. Even if the call is made by a cell phone, the first thing that the 911 dispatcher asks is “what is the address of your emergency?” If we don’t have that address, or even street in our computer, it can slow emergency response.

What we are requesting is that new addresses and/or street information be sent as soon as possible to our GIS. Using the fillable form on the website should make this a relatively easy process.

Thanks and please let us know if you have any questions or concerns, and thank you in advance for your cooperation!


Mark Mather                                                                                                     Tammy VanOverbeke

Lyon County Sheriff                                                                                        Lyon County Emergency Management


Lyon County Final Flood Insurance Rate Maps (FIRM)

Flood Image

Disclaimer: These maps are for reference only. Lyon County is not responsible for errors herein contained.

Interactive Flood Maps

Click to access interactive flood maps

Flood Insurance Rate Maps by Township in PDF format

Download this file (FloodplainTownships_Amiret.pdf)Amiret3987 kB
Download this file (FloodplainTownships_Lucas.pdf)Lucas3883 kB
Download this file (FloodplainTownships_Lynd.pdf)Lynd3950 kB
Download this file (FloodplainTownships_Lyons.pdf)Lyons4014 kB
Download this file (FloodplainTownships_Monroe.pdf)Monroe3904 kB
Download this file (FloodplainTownships_Nordland.pdf)Nordland4102 kB
Download this file (FloodplainTownships_RockLake.pdf)Rock Lake3967 kB
Download this file (FloodplainTownships_Shelburne.pdf)Shelburne4233 kB
Download this file (FloodplainTownships_Sodus.pdf)Sodus3990 kB
Download this file (FloodplainTownships_Stanley.pdf)Stanley3971 kB
Download this file (FloodplainTownships_Vallers.pdf)Vallers3940 kB
Download this file (FloodplainTownships_Clifton.pdf)Clifton3960 kB
Download this file (FloodplainTownships_Westerheim.pdf)Westerheim3891 kB
Download this file (FloodplainMarshall.pdf)City of Marshall3229 kB
Download this file (FloodplainTownships_CoonCreek.pdf)Coon Creek4159 kB
Download this file (FloodplainTownships_Custer.pdf)Custer4038 kB
Download this file (FloodplainTownships_EIDSVOLD.pdf)Eidsvold4114 kB
Download this file (FloodplainTownships_Fairview.pdf)Fairview3974 kB
Download this file (FloodplainTownships_Grandview.pdf)Grandview3872 kB
Download this file (FloodplainTownships_IslandLake.pdf)Island Lake4123 kB
Download this file (FloodplainTownships_LakeMarshall.pdf)Lake Marshall4063 kB
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Hours and Locations

Lyon County Government Center

8:00-4:30 M-F   Map

Public Works Building

8:00-4:30 M-F   Map

Law Enforcement Center

8:00-4:00 M-F   Map

Lyon County Zoning/SWCD

8:00-4:30 M-F   Map

Lyon County Landfill

6:00-4:00 M-F   Map


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