Learn About
The Commemorative
Quarter for
New Mexico
The Commemorative Quarter for New Mexico

The 2000 Census showed that Rio Arriba County had a population of 41,190 people. This represented 2.26% of the total population of New Mexico, making it the state's 13th most populous county (out of 33 counties).

From the Census Estimates for 2009<1>, Rio Arriba had a population of 40,678 people. This is a decrease of 1.24% since the 2000 Census.

The following table shows the recent changes in population. Other than 2000, the population counts have been estimated by the Census Bureau.

Since 2000
Year-to-Year Change
201040,246-2.29%-1.06% since 2009
200940,678-1.24%+0.17% since 2008
200840,609-1.41%-0.41% since 2007
200640,758-1.05%+0.52% since 2005
200540,546-1.56%-0.23% since 2004
200340,643-1.33%-0.63% since 2002
200240,902-0.7%-0.22% since 2001
200140,991-0.48%-0.48% since 2000
200041,190The Last Census

Rio Arriba County had 18,016 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Rio Arriba County has a total area<3> of 5,896 square miles [15,270 km²]. Of this total, only a minor amount of that area is covered by water (38.47 square miles [99.6 km²]).

Using the above population and land area values, Rio Arriba County had a population density of 7.03 people per square mile [2.72 people/km²], making it the state's 17th most densely populated county (out of 33 counties).

US Census QuickFacts

The Census Bureau has created documents containing demographic information that are called QuickFacts. A QuickFact that is specific to Rio Arriba County is available. The QuickFact also contains a comparison between Rio Arriba and the state of New Mexico.

Click here for the Rio Arriba County QuickFact (QF-35039).

Below are the counties that adjoin and form the boundaries of Rio Arriba County. A link to their specific Census QuickFact has been provided.

(2009 Est.)
(2000 Census)
Change in
Archuleta (CO)QF-08007   NW12,4309,89825.58%
Conejos (CO)QF-08021   NE7,8448,400-6.62%
Los AlamosQF-35028   SE18,07418,343-1.47%
MoraQF-35033   E4,9355,180-4.73%
San JuanQF-35045   W124,131113,8019.08%
SandovalQF-35043   S125,98889,90840.13%
Santa FeQF-35049   SE147,532129,29214.11%
TaosQF-35055   E31,50729,9795.1%

Other Roadside Stops ...

About New Mexico

Cities, Towns and Villages of New Mexico

Off-the-Road Links ...

U.S. Census Bureau
Census QuickFact for Rio Arriba County

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2000 Census and the next count will be for the 2010 Census.

- Return to Citation

<2>A Housing Unit is a broad term for those places where people live (whether occupied or temporarily vacant), such as a house, an apartment, a mobile home, or an area that is considered as a separate living quarter. Separate living quarters (consisting of one or more rooms) are considered to be those places where people live, sleep and eat separately from others and that have access to the outside (either directly or by a shared hallway).

- Return to Citation

<3>The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Rio Arriba. The value given by the Census Bureau reflects their statistical (or sampling) requirements.

- Return to Citation

<4>All Quarter-dollar coin images from the United States Mint.

- Return to Citation