NOTICE - Updated 4/9/2020

Due to the continued health concerns raised by the COVID-19 virus the Lyon County Government Center, Public Works and the landfill will be closed to the public until further notice.  
Auditor/Treasurer - 507-537-6724
Driver’s License - 507-537-6727
Recorder, Birth, Death, Marriage - 507-537-6722
Assessor - 507-537-6731
Court Administration - 507-537-6734
Probation - 507-537-6746
Veteran’s Services - 507-537-6729
Human Resources, Administration - 507-537-6961
Passports - 507-532-1339
Environmental (including Household Hazardous Waste and mattress recycling)   - 507-532-8210
Landfill - 507-865-4615
Lyon County Soil & Water Conservation District - 507-532-8207 Ext. 3
Highway - 507-532-8205
Residents may also contact county staff by email. Email addresses are listed on the county website at We apologize for any inconvenience that that this may cause, and we thank you for your understanding.  These precautions are necessary to ensure the safety of our employees and to slow the spread of the virus.  For more information about COVID-19 and how to prevent the spread of the virus, please visit or
Further updates will be posted to our website and Facebook page as they become available.

The Lyon County Assessor's Office is responsible for establishing the market value and determining classification of property for tax purposes as of January 2 of each year. Minnesota Statutes require the assessor to inspect properties at least once in a five year interval.

To ensure uniformity and accuracy, a physical (on-site and in-person) inspection is necessary to obtain initial property characteristic data. The primary objective of the quintile review process is to maintain and improve data quality, integrity, or consistency.

Valuation Notices are mailed each spring advising property owners of the current property value and classification of each parcel. Local, County and State Boards of Equalization are held each year to provide a fair and objective forum for property owners to appeal their valuation or classification. 

The Assessor's Office is responsible for programs such as Green Acres, Blind/Disabled, local option disaster abatement, and most frequently addressed is homestead.

Duties include property tax splits, property ownership splits and combinations, processing of all Certificates of Real Estate Values and more.

Assessor FAQs

  • What does the Assessing Department do?

  • What is "Estimated Market Value"?

  • What is "Classification"?

  • What is a "Homestead" and why does it matter?

  • How does the Assessor determine the estimated market value of my property?

  • How can my estimated market value change when I haven't done anything to my property?

  • Does the estimated market value increase at the same rate on all properties?

  • How will my taxes change as a result of a change to the estimated market value?

  • If property values are increasing, does this mean more tax dollars for the City, the County and the School?

  • What authority does the Assessor have to view my property and what happens if I refuse to let the Assessor view the interior of my home?

  • How does the Assessor notify me of my property's estimated market value and classification?

  • What if I don't agree with my estimated market value or classification?

  • What if, after this informal talk with the Assessor, I still disagree with the estimated market value or classification?

  • What evidence do I need to present to the Board of Appeal and Equalization?

  • Is there any assistance I may be eligible for in paying my property taxes?