Contact Info

Contact Info



1000 Central Ave Suite 210, Los Alamos NM 87544

Monday - Friday

8:00 am - 5:00 pm

County Assessor Ken Milder


Ken Milder
Term Ends December 31st 2019

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.


 Click here for more information on Notice of Values  Assessor FAQ - Frequently Asked Questions  Los Alamos County Property Tax Calendar  Los Alamos County Property Tax Calculation Click here to File a Protest 
 Los Alamos County Parcel Maps  Los Alamos County Assessor Forms  Los Alamos County Assessor Information Pamphlet Click here for Tax Schedule 

Assessor's Bulletin


Tax Bills to be Mailed Out November 1st 2017   Posted: 10/02/2017

2017 Property Tax rates have been approved.  To view the 2017 Property Tax Rates click here. Property Tax bills will be mailed out on or before November 1st 2017.  Please contact the Assessor's Office if you have any questions regarding Property Ownership, Name Changes, Address Corrections, or Property Valuation.  For information on Property Tax Payments please contact the County Customer Care Center at 505-662-8333.

Property Inspections

The Los Alamos County Assessor’s Office is currently conducting its required property inspections in the Barranca Mesa Subdivision. Appraisers from our office will be conducting physical inspections and verifying property information between the hours of 8AM and 5PM Monday through Friday.

Notice of Valuation to be Mailed out March 31st 2017.

The Notice of Property Values (NOV) were mailed out on March 31, 2017. The purpose of these notices is to inform you of the current ownership, legal description, applicable exemptions and the valuation assigned to your property.  Upon receipt of this notice, please read and verify that all information is correct. For information on understanding your Notice of Valuation click here.

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

Valuation Protest Board
Learn about the Valuation Protest Board and how you can become a member.
NOV's and Exemptions
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