The map above shows Idaho and New Mexico side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs New Mexico Geography
Land area
- Idaho has a land area of 82,645 square miles (214,051 km²), while New Mexico has 121,313 square miles (314,198 km²).
- New Mexico's land area is 1.5 times (47%) larger than Idaho's.
Total area
- Idaho: 83,569 square miles (216,441 km²) vs New Mexico: 121,593 square miles (314,925 km²), including inland and coastal water.
- New Mexico's total area is 1.5 times (46%) larger than Idaho's.
Length
- Idaho is 483 miles (778 km) long from north to south; New Mexico is 395 miles (635 km).
- Idaho's north-south length is 1.2 times (22%) longer than New Mexico's.
Width
- Idaho spans 352 miles (566 km) east to west; New Mexico spans 498 miles (801 km).
- New Mexico's east-west width is 1.4 times (41%) wider than Idaho's.
Highest point
- Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); New Mexico's is Wheeler Peak at 13,150 feet (4,008 m).
- Wheeler Peak is 519 feet higher than Borah Peak.
Lowest point
- Idaho's lowest point is Snake River at 718 feet; New Mexico's is Red Bluff Reservoir at 2,842 feet.
- Idaho's lowest point is 2,124 feet lower.
Idaho vs New Mexico Population and History
Population
- Idaho has a population of 2,001,619 (2024), while New Mexico has 2,130,256 (2024).
- New Mexico's population is 1.1 times (6%) larger than Idaho's.
Population density
- Idaho: 24.2 people per square mile vs New Mexico: 17.6.
- Idaho's population density is 1.4 times (38%) higher than New Mexico's.
Biggest city
- Idaho's biggest city is Boise with 237,963 people; New Mexico's is Albuquerque with 560,326.
- Albuquerque's population is 2.4 times (135%) larger than Boise's.
Largest metro area
- Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs New Mexico's Albuquerque, NM metro area (926,303).
- Albuquerque, NM metro area's population is 1.1 times (10%) larger than Boise City, ID metro area's.
History
- Idaho: Admitted to the Union on July 3, 1890, as the 43rd state.
- New Mexico: Admitted to the Union on January 6, 1912, as the 47th state.
- In its current form, Idaho is the older of the two by 22 years.
Idaho vs New Mexico Economy
GDP
- Idaho's GDP is $129.0 billion (2024) vs New Mexico's $147.1 billion.
- New Mexico's economic output is 1.1 times (14%) larger than Idaho's.
GDP per capita
- Idaho: $64,457 per person vs New Mexico: $69,046.
- New Mexico's GDP per capita is 1.1 times (7%) higher than Idaho's.
Average income
- Idaho: $62,323 vs New Mexico: $58,249 average income per person (per capita personal income).
- Idaho's average income is 1.1 times (7%) higher than New Mexico's.
Idaho vs New Mexico Counties
Number of counties
- Idaho has 44 counties, while New Mexico has 33.
- Idaho's county count is 1.3 times (33%) higher than New Mexico's.
Biggest county by area
- Idaho's largest county is Idaho County at 8,478 square miles; New Mexico's is Catron County at 6,924 square miles.
- Idaho County's land area is 1.2 times (22%) larger than Catron County's.
Smallest county by area
- Idaho: Payette County (407 sq mi) vs New Mexico: Los Alamos County (109 sq mi).
- Payette County's land area is 3.7 times (273%) larger than Los Alamos County's.
Most populous county
- Idaho: Ada County (535,799 people) vs New Mexico: Bernalillo County (671,747 people).
- Bernalillo County's population is 1.3 times (25%) larger than Ada County's.
Least populous county
- Idaho: Clark County (794 people) vs New Mexico: Harding County (635 people).
- Clark County's population is 1.3 times (25%) larger than Harding County's.
Richest county
- Idaho: Blaine County ($202,612 per capita income) vs New Mexico: Los Alamos County ($98,378).
- Blaine County's income is 2.1 times (106%) richer than Los Alamos County's.
Poorest county
- Idaho: Madison County ($29,485 per capita income) vs New Mexico: Cibola County ($36,397).
- Cibola County's income is 1.2 times (23%) richer than Madison County's.
Idaho vs New Mexico Taxes
State income tax
- Idaho has a top income tax rate of 5.3%, while New Mexico has a top income tax rate of 5.9%.
- New Mexico's top rate is 0.6 percentage points higher.
Property tax
- Idaho: 0.43% effective rate vs New Mexico: 0.63% of home value per year.
- New Mexico's rate is 0.2 percentage points higher.
Sales tax
- Idaho: 6.03% combined state and average local rate vs New Mexico: 7.68%.
- New Mexico's combined rate is 1.65 percentage points higher.
Official Websites
Idaho official website · New Mexico official website
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More Size Comparisons
All Idaho size comparisons · All New Mexico size comparisons
Area, elevation and boundary figures come from official national statistics and US Census Bureau and Natural Earth boundary data; US state population, economic, county and tax figures come from the US Census Bureau, the Bureau of Economic Analysis and the Tax Foundation. Figures are rounded and for general reference.