science

Tri-state area

Tri-state area is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Tri-state area rather than just read about it. In short: Tri-state area is an informal term in the United States which can refer to any of multiple areas that lie across three states. When referring to populated areas, the term implies a shared economy or culture among the area's residents, typically concentrated around a central metropolis.

Key takeaways

Tri-state area belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Tri-state area to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Tri-state area from memory before moving on to harder problems.

Reference excerpt

Tri-state area is an informal term in the United States which can refer to any of multiple areas that lie across three states. When referring to populated areas, the term implies a shared economy or culture among the area's residents, typically concentrated around a central metropolis. Tri-state areas may or may not include a state boundary tripoint.

Tri-state areas by region The following is not an exhaustive list. "Tri-state area" may refer to several additional places in locally understood contexts, such as a business name.

Northeast The New York tri-state area, which includes parts of New York, New Jersey and Connecticut. Pennsylvania is sometimes included in the meaning of this usage of the term, since the New York metropolitan statistical area, as defined by the U.S. Census Bureau, includes a small part of the Commonwealth of Pennsylvania, but one still has to cross New York to access the state from Connecticut. The Philadelphia tri-state area, which includes parts of Pennsylvania, New Jersey, and Delaware. This use of "tri-state" excludes Maryland even though its northeast corner is closely tied to Philadelphia. The Pittsburgh tri-state area, covering parts of Pennsylvania, Ohio, and West Virginia. Maryland, Pennsylvania, and West Virginia The Erie tri-state area, which includes parts of northwest Pennsylvania, Ohio and New York. The Minisink Valley tri-state area, which includes parts of New York, Pennsylvania and New Jersey. New York, Vermont and Massachusetts Vermont, New Hampshire, and Maine The Berkshires, a region usually considered to include only western Massachusetts and northwestern Connecticut; when the Taconic portion of New York is included, the area is sometimes described as the "tri-state" or "tri-corners" area. Massachusetts, Rhode Island, and Connecticut

Midwest The Chicago tri-state area, or "Chicagoland," which includes northeast Illinois, Northwest Indiana and southeast Wisconsin. The Tri-State Tollway connects Wisconsin's portion with Indiana's. Parts of southwest Michigan in the Michiana region are also culturally tied to Chicago. The Illinois–Indiana–Kentucky tri-state area, centered around the confluence of the Wabash and Ohio Rivers. The Cincinnati tri-state area, which includes parts of Ohio, Kentucky and Indiana. Kyova, a region named for Kentucky, Ohio and West Virginia and home to Tri-State Airport. The Dubuque tri-state area, which includes parts of Iowa, Illinois and Wisconsin. The Fort Madison-Keokuk tri-state area, also known as the Quincy tri-state area, which includes parts of Iowa, Illinois and Missouri. The Sioux City metropolitan area region of Iowa, Nebraska, and South Dakota. The La Crosse tri-state area, which includes parts of Wisconsin, Minnesota and Iowa. The Tri-State district, a lead and zinc mining region of Oklahoma, Kansas and Missouri, known for producing "tri-state" minerals consisting mainly of sphalerite.

South The DMV, which includes the city of Washington (coterminous with the District of Columbia) as well as surrounding portions of Maryland and Virginia. Although the District of Columbia is not a state, the region is sometimes referred to as a "tri-state area." Furthermore, the Washington–Arlington–Alexandria metropolitan statistical area, as defined by the U.S. Census Bureau, includes Jefferson County, West Virginia, making the region a true tri-state area. The Illinois–Indiana–Kentucky tri-state area, centered around the confluence of the Wabash and Ohio Rivers. The Delmarva area, which includes Delaware and the eastern shores of Maryland and Virginia. Greater Memphis or the Mid-South, which includes west Tennessee, northwest Mississippi, and the Delta region of Arkansas. The Wiregrass Region, which includes southeast Alabama, southern Georgia and the Florida Panhandle. The Ark-La-Tex, a socioeconomic region that includes thirty-nine counties/parishes in Arkansas, Louisiana and Texas. The Southern Appalachian Tri-State Area, which includes portions of South Carolina, North Carolina, and Georgia, near the point where the three states converge. This region covers areas around Lake Hartwell and the Ellicott Rock Wilderness along the Chattooga River. Kyova, a region named for Kentucky, Ohio and West Virginia and home to Tri-State Airport.

West The Inland Northwest, historically and alternatively known as the Inland Empire, which includes Washington, Idaho, and Oregon. The Mohave Valley area of Bullhead City, Arizona; Needles, California; and Laughlin, Nevada.

See also List of tripoints of U.S. states Four Corners Four-state area Twin cities, which includes tri-city Quad cities Three-Country Cairn, the tripoint where the borders of Norway, Sweden and Finland meet Phineas and Ferb, whose primary setting is a fictional, otherwise unnamed tri-state area

References

Worked examples

Example 1 — a first encounter with Tri-state area

Start with the simplest possible case. Write down what Tri-state area claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Tri-state area before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Tri-state area ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Tri-state area

In research: Tri-state area appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Tri-state area in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Tri-state area is common in secondary-school and first-year university syllabi. It links to neighbouring topics Border-related lists, Borders of U.S. states, Geography of the United States, so understanding it makes those chapters shorter.
In everyday life: Look for Tri-state area outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Tri-state area in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Tri-state area means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Tri-state area out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Tri-state area in simple terms?

Why does Tri-state area matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Tri-state area?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Tri-state area.