County: First Half Of Property Taxes Due Dec. 10


Property tax bills for 2021 will be mailed to property owners by Los Alamos County’s Finance Department on November 1. The first half of property taxes is due Friday, December 10th to avoid late payment penalty and interest charges.   

It is the responsibility of the property owner to ensure property taxes are paid. If someone else is to pay on your behalf, you will need to contact them directly regarding this matter.  


  1. In person. Property owners can remit payment in person at the Customer Care Center located in the lobby of the Municipal Building, 1000 Central Ave., by 5 p.m. on December 10 
  2. Dropbox. Property owners can drop a check or money order sealed in an envelope, in one of the two drop boxes conveniently located in the parking lot and lobby of the Municipal Building, 1000 Central Ave. Customer Care staff collects drop box payments at 5 p.m. each business day 
  3. U.S. Postal Service. Payments can be mailed to Los Alamos County, P.O. Box 99, Los Alamos, NM 87544-0099 but must be postmarked by midnight., Friday, December 10    
  4. Online. As of 2020, the County Finance Department began accepting tax payments online through Payments will need to be made by 3:00PM on December 10 to meet the processing deadline. Property owners will need the County Authorization Code available on the November 1, 2021 tax bill to create an account. Instructions are available on the Customer Care website at under the Property Tax Payments tab.    

For  information regarding the property tax owner, name change, address correction, valuation, and more,  contact the County Assessor at 662-8030 or visit the County Assessor’s web page.  

Questions related to tax payments may be directed to the Customer