Contact Info

Contact Info



1000 Central Ave Suite 210, Los Alamos NM 87544

Monday - Friday

8:00 am - 5:00 pm

Ken Milder

***Due to conditions of the recent COVID-19 virus, the Assessor has suspended in person services. Please call or email our office and one of our friendly staff members will be more than happy to answer your questions. ***


Notices of Property Value (NOV) were mailed on March 31, 2020.  This notice informs you of the current ownership, legal description, applicable exemptions and valuation assigned to your property for taxation purposes. Upon receipt of this notice, please read and verify that all information is correct. Contact the Assessor’s Office with questions regarding the NOV.

If you have questions regarding the valuation process, exemptions, protest procedures or any other property tax related issue, do not hesitate to contact our office.  You do not have to file a property valuation protest to inquire about assessment procedures or to have your property valuation reviewed and explained.  A fee simple appraisal, although optional, is not required for appeals.

If you would like to file a protest concerning your valuation, classification, allocation of value to a particular governmental unit, denial of exemption or limitation on increases in value, you must file your protest within 30 days of the mailing of your NOV.

Protest Forms are available on this website or outside our office at the Los Alamos County Municipal Building. Please feel free to call or email our office and one of our friendly staff members will assist you in filing a protest.


Ken Milder

Term Ends December 31st 2022

The mission of the Los Alamos County Assessor’s Office is to provide excellent public service by providing complete, accurate and timely assessments of all property subject to taxation in accordance with the Property Tax Code applicable statutes, orders, regulations and laws, the tenants of the International Association of Assessing Officers, and Uniform Standard of Professional Appraisal Practice, with a well-managed office and professional staff.


  • Provide for a Property Valuation Maintenance Program that implements the process utilized in the valuation of property taxation and complies with the Property Tax Code.
  • Provide fair, uniform and equitable assessments on all real and personal property subject to property taxation, by utilizing a computer assisted mass appraisal (CAMA) system incorporated with a geographic information system (GIS).
  • Meet or exceed the requirements of the New Mexico Property Tax Division and the Property Tax Code for level of assessment and uniformity by constant market analysis.
  • Provide current, accurate information to the public as well as other departments and governmental entities upon which to base decisions on.
  • Conduct educational outreach programs to increase public awareness of assessment process and taxpayer benefits available.
  • Provide and maintain a professional, certified, and knowledgeable staff.

The Assessor's Office also welcomes any questions, comments or concerns. Please feel free to visit us at the address shown to the left or contact us by phone or mail.


 NOV Image  Assessor FAQ - Frequently Asked Questions  Los Alamos County Property Tax Calendar  Los Alamos County Property Tax Calculation Click here to File a Protest 
 Parcel Map  Access Property and Assessor Forms  Informational Pamphlets  Get information about the tax schedule

Publications and Presentations

 Helpful Tips  Business Personal Property Video Presentation  Understanding NOV and 3% cap


2013 NM PTD Evaluation


"The overall operation of the Los Alamos County Assessor's Office is considered excellent."

-David Ortiz
Appraisal Bureau Chief
State of New Mexico Property Tax Division


Links and Documents

Description of the Notice of Valuation process and Exemptions.

Other Property Tax Related Links

New Mexico Property Tax Division
Information about the Appraisal Bureau, State Assessed Property Bureau and the Delinquent Property Tax Bureau.
New Mexico Department of Finance and Administration; Local Government Division
Assistance with the appropriate use of public funds.
New Mexico Association of Counties
Find out how counties work together to solve common problems.
New Mexico Department of Veterans Services
Information about support services for New Mexico Veterans
International Association of Assessing Officers (IAAO)
Resource of information for property appraisal, assessment administration, and property tax policy.
Office of The State Engineer
Click link to see how water right transfers are affected by state law.
New Mexico Livestock Board
Click here for information regarding livestock registry, inspections and transfers.
New Mexico Manufactured Housing Division
Click here for information related to Manufactured Homes