Four Corners States: Where Arizona, Colorado, New Mexico & Utah Meet

The Four Corners states are Arizona, Colorado, New Mexico, and Utah. Their borders meet at a single point in the American Southwest, marked by the Four Corners Monument. Utah lies to the northwest, Colorado to the northeast, Arizona to the southwest, and New Mexico to the southeast.

This is the only place in the United States where four state boundaries meet at one point. Geographers call such an intersection a quadripoint. Congress formally recognized the site’s distinction in the Four Corners Interpretive Center Act.

Four Corners States Map: Where Each State Lies

Read the map clockwise from the northwest corner: Utah, Colorado, New Mexico, and Arizona. The arrangement is easier to understand in a table:

Important distinction: Arizona and Colorado touch at the common point, but they do not share a stretch of border. The same is true of Utah and New Mexico. On the map, those are the diagonal state pairs.

Where Do the Four Corners States Meet?

All four states meet at Four Corners Monument, a remote landmark near approximately 37° north latitude and 109°03′ west longitude. The monument is operated by Navajo Nation Parks & Recreation as a Navajo Tribal Park.

At the center of the plaza, a survey marker shows the legally recognized intersection. The surrounding design labels each state in its respective direction, making it possible to see the boundary arrangement while standing at the site.

The location lies within the broader Four Corners region, which stretches across parts of all four states. A point on a map and a multi-state region are related, but they are not interchangeable.

Why Is Four Corners Unique?

Four Corners is a state quadripoint: a single point where four political boundaries converge. Three-state meeting points, often called tripoints, are more common. The Four Corners Monument is unusual because no other point in the United States connects four states in this way.

That claim is about U.S. state boundaries, not every kind of administrative or international boundary. The 1999 Four Corners Interpretive Center Act explicitly identifies Arizona, Colorado, New Mexico, and Utah as the four states meeting here.

It also creates a geographical distinction that can be missed on simplified maps: two states can touch at a point without sharing a border of measurable length. Four Corners provides a particularly clear example.

How Was the Four Corners Boundary Established?

The intersection took shape during nineteenth-century surveys of western U.S. territorial boundaries. Congress’s Four Corners legislation notes that the boundary lines creating the intersection were drawn between 1868 and 1875.

A crucial survey took place in 1875, when surveyor Chandler Robbins was assigned to establish the Arizona–New Mexico territorial boundary. His work reached the 37th parallel, where it connected with the existing New Mexico–Colorado boundary survey. Later boundary work completed the familiar four-state arrangement.

The surveying instructions also explain a surprisingly persistent misconception. An 1863 act described the Arizona–New Mexico line as 32 degrees west of the Washington Meridian, not 109 degrees west of Greenwich. Those reference meridians are different. In modern Greenwich-based terms, the intended line was approximately 109°03′ W, rather than exactly 109° W.

According to the National Oceanic and Atmospheric Administration (NOAA), Robbins used the available tools and the coordinates prescribed for his assignment. Survey markers at the location have subsequently been replaced or reconstructed, but the established legal corner has been preserved.

Is the Four Corners Monument in the Wrong Location?

No. Four Corners Monument marks the legally accepted meeting point of the four states. The claim that it is approximately 2.5 miles out of place comes largely from confusing the historical Washington Meridian with the Greenwich Meridian used on modern maps.

NOAA explains that when the correct historical instructions are considered, the difference between the monument and the estimated intended position is approximately 1,800 feet or less, with uncertainty in reconstructing nineteenth-century measurements. That is not the widely repeated 2.5-mile error.

More importantly, the location of an accepted survey monument has legal significance. The original surveyed corner was recognized as the boundary point by the relevant authorities; a theoretical coordinate calculated today does not automatically replace it. As NOAA’s National Geodetic Survey explains, the existing monument correctly identifies where the four states meet.

Four Corners Monument vs. the Four Corners Region

Four Corners Monument is one surveyed point. The Four Corners region is a much larger area covering adjoining portions of Utah, Colorado, Arizona, and New Mexico.

Much of the region is associated with the Colorado Plateau, whose landscapes include mesas, sandstone cliffs, canyons, high deserts, and broad plateaus. The region also includes mountainous terrain, archaeological sites, and Indigenous communities and homelands. The Navajo Nation and Ute Mountain Ute Tribe have longstanding connections to the monument and surrounding landscape, recognized in federal legislation.

Southwestern Colorado’s Mesa Verde area, southeastern Utah’s canyon country, northeastern Arizona’s plateaus, and northwestern New Mexico’s high desert all help illustrate how the broader region extends far beyond the small monument plaza.

For additional U.S. geographic context, see Geographic Travels’ guides to the most mountainous U.S. states and the states that border Mexico.

Visiting Four Corners Monument: Hours and Entrance Fee

Four Corners Monument is a Navajo Tribal Park, not a National Park Service monument. Visitors come to see the marker, take photographs, and browse offerings from Navajo vendors, including handmade items and traditional foods.

According to Navajo Nation Parks & Recreation, the published seasonal opening hours are:

Entrance fee: Visitor reports from 2026 mention a charge of around $10 per person, but this is not a confirmed official price. The Navajo Nation Parks & Recreation monument page does not currently publish a site-specific admission rate. Fees, accepted payment methods, and hours may change; the site also closes for major Navajo Nation holidays. Check the official park information or call (928) 730-5551 before visiting.

Visitors can position their hands or feet around the central survey marker to touch all four states at once. For most travelers, the monument is best treated as a distinctive stop on a longer Southwest road trip rather than an attraction requiring an entire day.

The Bottom Line

The four Four Corners states are Arizona, Colorado, New Mexico, and Utah. Their boundaries meet at the Four Corners Monument, creating the only four-state quadripoint in the United States. The monument is historically and legally significant, while the surrounding Four Corners region encompasses a much wider landscape shaped by the Colorado Plateau and the communities that call it home.

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