What Are The Contiguous 48 States

The contiguous 48 states refer to the group of U.S. states that are linked together on the North American mainland, forming a single, uninterrupted landmass. This term excludes Alaska and Hawaii, which are separated from the mainland by Canada and the Pacific Ocean, respectively. Understanding the concept of the contiguous 48 states is essential for anyone studying U.S. geography, planning cross‑country travel, or exploring regional demographics. In this article we will define the phrase, list each state, explain why the distinction matters, and address common questions that arise when learning about the contiguous 48 states.

What Does “Contiguous 48” Mean?

Definition and Boundaries

The word contiguous describes something that is in contact along a boundary; in geographic terms, it means the states share a common border without any foreign territory in between. When combined with “48,” the phrase specifies the exact number of states that meet this criterion. The boundaries of the contiguous 48 were largely established through a series of treaties, purchases, and boundary disputes from the early 1800s to the early 1900s.

• Mainland connection: All 48 states touch at least one other state in the group.
• Exclusions: Alaska, the 49th state, lies northwest of Canada, and Hawaii, the 50th state, is an archipelago in the Pacific Ocean.

These definitions are often used in educational contexts, legal documents, and everyday conversation when distinguishing between the mainland United States and its non‑contiguous territories.

The States Included

List of the 48 States

Below is the complete roster of the contiguous 48 states, presented in alphabetical order for easy reference:

1. Alabama
2. Arizona
3. Arkansas
4. California
5. Colorado
6. Connecticut
7. Delaware
8. Florida
9. Georgia
10. Idaho
11. Illinois
12. Indiana
13. Iowa
14. Kansas
15. Kentucky
16. Louisiana
17. Maine
18. Maryland
19. Massachusetts
20. Michigan
21. Minnesota
22. Mississippi
23. Missouri
24. Montana
25. Nebraska
26. Nevada
27. New Hampshire
28. New Jersey
29. New Mexico
30. New York
31. North Carolina
32. North Dakota
33. Ohio
34. Oklahoma
35. Oregon
36. Pennsylvania
37. Rhode Island
38. South Carolina
39. South Dakota
40. Tennessee
41. Texas
42. Utah
43. Vermont
44. Virginia
45. Washington
46. West Virginia
47. Wisconsin
48. Wyoming

Each of these states shares a land border with at least one other state in the list, creating a continuous landmass that stretches from the Atlantic Ocean on the east coast to the Pacific Ocean on the west coast.

Geographic Groupings

The contiguous 48 states can be further divided into regions that help educators and travelers conceptualize the area:

• Northeast: Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, Connecticut, New York, New Jersey, Pennsylvania, Delaware, Maryland, District of Columbia (though not a state, often grouped here).
• Midwest (or Great Lakes region): Ohio, Indiana, Illinois, Michigan, Wisconsin, Minnesota, Iowa, Missouri, Kansas, Nebraska, North Dakota, South Dakota.
• South: West Virginia, Virginia, Kentucky, Tennessee, North Carolina, South Carolina, Georgia, Alabama, Mississippi, Arkansas, Louisiana, Texas, Florida.
• West: California, Nevada, Arizona, Utah, Colorado, New Mexico, Wyoming, Montana, Idaho, Washington, Oregon.

These groupings are not official but are useful for analyzing climate, culture, and economic patterns.

Why Are They Called Contiguous?

Geographic and Political Reasons

The term contiguous originated from early American expansionism. As the United States acquired new territories through purchases (e.g., the Louisiana Purchase) and wars (e.g., the Mexican‑American War), the original 13 colonies gradually grew into a larger nation. By the time the 48th state—Arizona—joined the Union in 1912, the nation’s mainland was essentially “stitched together” by a series of state boundaries.

• Historical context: The original states were clustered along the Atlantic seaboard. Subsequent admissions filled in the gaps between them, creating a continuous block.
• Legal usage: Federal statutes often reference the “contiguous United States” when defining jurisdiction, taxation, or environmental regulations that apply only to the mainland.

Understanding this historical backdrop clarifies why the phrase persists in modern discourse and why it is distinct from terms like “continental United States,” which can sometimes include Alaska and Hawaii in a broader sense.

Map and Visualization

While we cannot embed images directly, imagine a map where the 48 states appear as a single, solid shape surrounded by two oceans and the Canadian border. The only breaks in this shape are the narrow gaps where Alaska meets Canada and the Hawaiian Islands sit far out in the Pacific. This visual makes it easy to see why the term contiguous accurately describes the land connection.

Common Misconceptions

Alaska and Hawaii

A frequent point of confusion is whether Alaska should be considered part of the contiguous 48. The answer is no; Alaska is separated