A photograph of United States

Country guide

United States

At 9,833,520 km² the United States has the fourth-largest land area in the world, and its 50 states and federal district span enough longitude that the ordinary...

Photograph · Tuxyso · CC BY-SA 3.0

43,277 Places
10Cities

Reviewed by Elena Voss · Roavina Travel Editor

At 9,833,520 km² the United States has the fourth-largest land area in the world, and its 50 states and federal district span enough longitude that the ordinary clock runs from UTC−4 to UTC−10, with the territories reaching −12, +10 and +11. The 2025 population estimate is 341,784,857. Washington, D.C. is the capital and New York the largest city, but neither stands in for the rest of it. Distance is the planning problem here, not choice: a trip works far better as one region covered properly than as anything resembling a national tour.

Checked 2026-08-25

Cities

Every city catalogued in this country so far, ranked by how much there is to see.

Practical information

Language spoken
English is the principal language; no federal official language
National practical orientation; regional and minority languages may also be used
Dialling code
+1
International calling code; local area and mobile prefixes still apply
Currency
United States dollar (USD)
Use the official local currency; card acceptance varies by place
Emergency number
911
Use only for an emergency; tourist assistance may use a separate number
Plug type
Type A and B · 120 V
Check that chargers support the recorded voltage before using an adapter
Tap water
Not recorded
Water quality is regulated locally; check the current notice for the destination

Top things to see

Ranked by importance — sitelinks, pageviews and heritage status, not editor preference.

  1. Welcome to Fabulous Las Vegas Sign Welcome to Fabulous Las Vegas Sign
    02 45 min

    Welcome to Fabulous Las Vegas Sign

    The Welcome to Fabulous Las Vegas sign is a landmark located on the south end of the Las Vegas Strip in Paradise, Nevada. The sign was designed by Betty Willis and erected in 1959.

    • Must see
    • Historic monument
    • Las Vegas
  2. Hoover Dam Hoover Dam
    03 45 min

    Hoover Dam

    Hoover Dam is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between Nevada and Arizona. Constructed between 1931 and 1936 during the Great Depression, it was dedicated by President Franklin D.

    • Must see
    • Historic monument
    • Las Vegas
  3. Ellis Island Ellis Island
    04 1 hour

    Ellis Island

    Ellis Island is a federally owned island in New York Harbor. It operated as the nation's busiest immigrant inspection station from 1892 to 1954, processing approximately twelve million arrivals.

    • Must see
    • Historic monument
    • New York
  4. Battleship Missouri Memorial Battleship Missouri Memorial
    05 45 min

    Battleship Missouri Memorial

    USS Missouri

    The Battleship Missouri Memorial is a museum ship and war memorial located at Pearl Harbor. The USS Missouri is an Iowa-class battleship that served in World War II, the Korean War, and the Gulf War.

    • Must see
    • Historic monument
    • Honolulu
  5. Massachusetts State House Massachusetts State House
    06 1 hour

    Massachusetts State House

    The Massachusetts State House serves as the seat of government for the Commonwealth of Massachusetts.

    • Must see
    • Historic monument
    • Boston

Source: OpenStreetMap contributors, Wikidata ·

Common questions

How long should a first trip to United States be?

Ten to fourteen days should focus on one US region: New York, Washington, and Boston work together by rail, while San Francisco, Los Angeles, and Las Vegas form a different trip. Miami, Orlando, and Honolulu each require separate travel time and should not be appended casually.

What entry documents are needed for United States?

US admission depends on passport, visa status, and eligibility for the Visa Waiver Program and ESTA. Confirm both the Department of State visa guidance and Customs and Border Protection requirements for the actual route.

What is the best way to travel around United States?

Domestic flights are often necessary between US regions, while Amtrak is strongest on the Northeast Corridor. A car is unnecessary in New York or Washington but can be useful in Los Angeles and beyond compact city centres.

When is a practical time to visit United States?

April to May and September to October are broad shoulder-season references, not a national weather forecast. Florida heat, western wildfire conditions, hurricane exposure, and Hawaii's trans-Pacific logistics require destination-specific checks.

What money and payment basics apply in United States?

The United States uses the US dollar (USD). Card use is widespread, but taxes, deposits, and gratuities can make the final amount differ from the displayed base price; keep a second payment method for holds or terminal failures.

What practical safety details should I save for United States?

Dial 911 for police, fire, or medical emergencies in the United States. Type A and B sockets use 120 V; national tap-water safety is not recorded here, so consult the local utility or accommodation.