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County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in Los Alamos County, New Mexico

Los Alamos County has an effective property tax rate of 0.55%. On the median home value of $495,800, that's roughly $2,717 per year. Median household income is $147,139.

Effective Property Tax Rate1
0.55%
median tax $2,717 ÷ median home $495,800
Median Home Value1
$495,800
owner-occupied
Median Household Income1
$147,139
per-capita $74,704
Est. Annual Tax on Median Home1
$2,717
at 0.55% effective rate

What you'll pay, at a glance

Property taxes are the largest local tax most homeowners pay. The effective rate measures the real tax bill as a share of home value — a more useful number than the nominal “mill rate,” because assessment practices vary county to county.

MetricLos Alamos CountyNew Mexico (state context)
Effective property tax rate10.55%0.55%
Median home value1$495,800—
State income tax3top rate 5.90%top rate 5.90%
State sales tax37.68% combined7.68% combined

How this is calculated

The effective property tax rate is the median real-estate tax bill divided by the median home value — both for owner-occupied homes, from the U.S. Census Bureau's American Community Survey (ACS 5-year estimates)1. Median income is also from the ACS1. Federal and state income-tax figures use IRS2 and Tax Foundation3 data.

About Los Alamos County, NM

In Los Alamos County, New Mexico, the median home is valued at $495,800, and the annual real-estate tax bill on that home comes to $2,717, based on an effective rate of 0.548%. That matches the statewide median rate exactly, and ranks the county 17th of 33 in New Mexico. Against a median household income of $147,139, the yearly tax equals roughly 1.8% of what a household brings in. Nationally, the median effective rate is 0.794%, so this county sits well below the norm. The largest community here is Los Alamos, with White Rock also within the county. For a household budget, the property tax line stays a contained expense, one that leaves the bulk of annual income available for housing payments, savings, and everyday costs.

Frequently asked questions

What is the property tax rate in Los Alamos County, NM?
The effective rate is 0.55% — meaning the median tax bill equals about 0.55% of the median home value.
How much are property taxes on a median home?
On the median home ($495,800), the estimated annual bill is about $2,717.
Is Los Alamos County's rate high or low?
Compare it to the state median of 0.55% and the national average near 1.1%.
How does the effective rate differ from my mill rate?
A mill rate is the nominal levy per $1,000 of assessed value. The effective rate reflects what you actually pay after exemptions and assessments — it's the median tax bill as a share of median home value, so it better predicts your real cost.
Will a reassessment raise my tax bill?
Not necessarily. If your home's assessed value rises, your bill can go up, but only if the mill rate and exemptions stay flat. Contact the Los Alamos County assessor's office to review your current assessment.
Can I appeal my property tax assessment?
Yes. Most counties allow an appeal when you believe the assessed value exceeds the market value. File with the Los Alamos County assessor within the local deadline, typically with comparable sales as evidence.
Sources
[1] U.S. Census Bureau — ACS 5-Year (2023) — Median home value (B25077), median real-estate taxes (B25103), median household income (B19013), per-capita income (B19301).
[2] IRS — Statistics of Income — County income, AGI, and real-estate taxes paid.
[3] Tax Foundation — State income, sales, corporate, and estate/inheritance tax rates.