Western United States

===Subregions===
The region is split into two smaller units or divisions, by the U.S. Census Bureau:<ref name="CensusRegionsMap">{{cite web|title=Census Regions and Divisions of the United States|url=https://www.census.gov/geo/maps-data/maps/pdfs/reference/us_regdiv.pdf|url-status=dead|archive-url=https://web.archive.org/web/20130921053705/https://www.census.gov/geo/maps-data/maps/pdfs/reference/us_regdiv.pdf|archive-date=September 21, 2013|access-date=November 25, 2014|website=U.S. Census Bureau}}</ref>

; [[Mountain states]]: [[Montana]], [[Wyoming]], [[Colorado]], [[New Mexico]], [[Idaho]], [[Utah]], [[Arizona]], and [[Nevada]]
; [[West Coast of the United States|Pacific states]]: [[Washington (state)|Washington]], [[Oregon]], [[California]], [[Alaska]], and [[Hawaii]]

Other classifications distinguish between [[Southwestern United States|Southwest]] and [[Northwestern United States|Northwest]]. Arizona, New Mexico, [[West Texas]], and the [[Oklahoma panhandle]] are typically considered to be the Southwest states. Meanwhile, the states of Idaho, Montana, Oregon, and Washington can be considered part of the Northwest or [[Pacific Northwest]].

The term [[West Coast of the United States|West Coast]] is commonly used to refer to just California, Oregon, Washington, and Alaska, whereas Hawaii is more geographically isolated from the [[Continental America|continental U.S.]] and does not necessarily fit in any of these [[subregion]]s.
{| class="wikitable sortable"
![[List of states and territories of the United States|State]]
!2020 Census<ref name="Census2020" />
!2010 Census<ref>{{cite web|url=http://2010.census.gov/2010census/data/apportionment-pop-text.php |title=Resident Population Data: Population Change |date=December 23, 2010 |publisher=[[United States Census Bureau]] |access-date=December 23, 2010 |archive-url=https://web.archive.org/web/20101225031104/http://2010.census.gov/2010census/data/apportionment-pop-text.php |archive-date=December 25, 2010 |url-status=dead }}</ref>
!Change
!Area<br /><ref name="20177766775 ggfghhnnyyhhnnjuuijjyyknnbbnnnjii9jmnhijj0census" />
!Density
|-
|{{flag|Arizona}}
| {{change|invert=on|7151502|6392017}}
|{{convert|113594.08|sqmi|abbr=on}}
|{{Pop density|7151502|113594.08|sqmi|km2|prec=0}}
|-
|{{flag|Colorado}}
| {{change|invert=on|5773714|5029196}}
|{{convert|103641.89|sqmi|abbr=on}}
|{{Pop density|5773714|103641.89|sqmi|km2|prec=0}}
|-
|{{flag|Utah}}
| {{change|invert=on|3271616|2763885}}
|{{convert|82169.62|sqmi|abbr=on}}
|{{Pop density|3271616|82169.62|sqmi|km2|prec=0}}
|-
|{{flag|Nevada}}
| {{change|invert=on|3104614|2700551}}
|{{convert|109781.18|sqmi|abbr=on}}
|{{Pop density|3104614|109781.18|sqmi|km2|prec=0}}
|-
|{{flag|New Mexico}}
| {{change|invert=on|2117522|2059179}}
|{{convert|121298.15|sqmi|abbr=on}}
|{{Pop density|2117522|121298.15|sqmi|km2|prec=0}}
|-
|{{flag|Idaho}}
| {{change|invert=on|1839106|1567582}}
|{{convert|82643.12|sqmi|abbr=on}}
|{{Pop density|1839106|82643.12|sqmi|km2|prec=0}}
|-
|{{flag|Montana}}
| {{change|invert=on|1084225|989415}}
|{{convert|145545.80|sqmi|abbr=on}}
|{{Pop density|1084225|145545.80|sqmi|km2|prec=0}}
|-
|{{flag|Wyoming}}
| {{change|invert=on|576851|563626}}
|{{convert|97093.14|sqmi|abbr=on}}
|{{Pop density|576851|97093.14|sqmi|km2|prec=0}}
|-
|- class="sortbottom" style="background:#fbfbbb"
|'''Mountain'''
| {{change|invert=on|24919150|22065451|bgcolour=#fbfbbb}}
|{{convert|855766.98|sqmi|abbr=on}}
|{{Pop density|24919150|855766.98|sqmi|km2|prec=0}}
|-
|{{flag|California}}
| {{change|invert=on|39538223|37254523}}
|{{convert|155779.22|sqmi|abbr=on}}
|{{Pop density|39538223|155779.22|sqmi|km2|prec=0}}
|-
|{{flag|Washington}}
| {{change|invert=on|7705281|6724540}}
|{{convert|66455.52|sqmi|abbr=on}}
|{{Pop density|7705281|66455.52|sqmi|km2|prec=0}}
|-
|{{flag|Oregon}}
| {{change|invert=on|4237256|3831074}}
|{{convert|95988.01|sqmi|abbr=on}}
|{{Pop density|4237256|95988.01|sqmi|km2|prec=0}}
|-
|{{flag|Hawaii}}
| {{change|invert=on|1455271|1360301}}
|{{convert|6422.63|sqmi|abbr=on}}
|{{Pop density|1455271|6422.63|sqmi|km2|prec=0}}
|-
|{{flag|Alaska}}
| {{change|invert=on|733391|710231}}
|{{convert|570640.95|sqmi|abbr=on}}
|{{Pop density|733391|570640.95|sqmi|km2|prec=0}}
|-
|- class="sortbottom" style="background:#fbfbbb"
|'''Pacific'''
| {{change|invert=on|53669422|49880669|bgcolour=#fbfbbb}}
|{{convert|895286.33|sqmi|abbr=on}}
|{{Pop density|53669422|895286.33|sqmi|km2|prec=0}}
|-
|- class="sortbottom" style="background:#fbfbbb"
|'''West'''
| {{change|invert=on|78588572|71946120|bgcolour=#fbfbbb}}
|{{convert|1751053.31|sqmi|abbr=on}}
|{{Pop density|78588572|1751053.31|sqmi|km2|prec=0}}
|}