Washington, D.C. is the capital city of the United States of America. "D.C." is an abbreviation for the District of Columbia, the federal district coextensive with the city of Washington. The city is located on the northern shore of the Potomac River and is one of the most visited cities in the world, with more than 20 million tourists annually.

The city of Washington, commonly referred only as DC, has a total area of 177 square kilometres and is surrounded by the states of Maryland and Virginia. Washington's climate is typical of the Mid-Atlantic states, with four distinct seasons. Summer tends to be hot and humid and winter brings sustained cool temperatures and occasional heavy snow.

Washington DC is important both politically and historically. First of all, the city is the seat of the Federal Government and several international organizations. The city was founded after the American Revolution and its name was coined after George Washington, the first president of the United States.
 

• The estimated population of Washington DC is 705,749 according to the data of 2020.
• It is the 20th most populous city in the United States.
• The urban area of Washington DC is in the sixth position in the US in terms of population with 6.2 million residents.
  • Head of State: President Donald Trump, since 2017.
  • Language: English
  • Country motto: In God We Trust.
  • Currency: US Dollar ($)
  • Median age: 38.2 years
  • Life expectancy: 80.1 years
  • Religion: 75.5% Christianity, 1.1% Islam, 18.6% Unaffiliated, 1.7% Judaism, 1.2% Buddhism, 0.7% Hinduism, 1.1% Others.

All three branches of the US Federal Government are located in Washington DC. These three branches are Congress, the President, and the Supreme Court.

The U.S. Constitution gives the Congress direct jurisdiction over Washington, D.C. While Congress has delegated various amounts of this authority to local government, including an elected mayor and city council, the congress still intervenes in local affairs relating to schools, gun control policy, and other issues.

Citizens of the District have no voting representation in the Congress. They are represented in the House of Representatives by a non-voting delegate who sits on committees. D.C. has no representation in the Senate.

The city is also the home of many attractive historical monuments and museums. In Washington DC, there are around 177 Foreign Embassies. The headquarters of most of the international organizations of the world are in the city, including the IMF, AARP, NGS, HRC, and IFC.

Washington has the sixth-largest economy in the country. Its position on the Pacific Ocean and the harbour of Puget Sound give the state a leading role in maritime trade with Alaska, Canada, and Asia.

In the second quarter of 2018, the gross state product of Washington DC was $141 Billion.

The city's economy is dominated by the service sector as a result of Washington’s abundance of federal civil service jobs and its status as a major tourist destination.

Most businesses are linked in some way to the federal government but there is also significant businesses that include the design and manufacture of jet aircraft, computer software development (Microsoft, Amazon, Nintendo), biotechnology, aluminium production and wood products. The state also has significant amounts of hydroelectric power generation.

Washington is also a leading agricultural state. It has been ranked the first in the nation producing a variety of fruit and vegetables like raspberries, peas, pears, carrots, blueberries, grapes, lentils and potatoes.

At the time of this writing—the 2021 tax year—Washington D.C. has a 6% sales tax rate, as well as the eighth-lowest property tax rate among all U.S. states. Furthermore, Washington D.C. imposes 5 tax brackets from which it levies income taxes. Although this sounds complicated, there are specific types of tax calculators available online that simplify the process.

Finally, it is noted that, even though Washington is not specially known as a manufacturing centre, a number of useful natural resources found in the area are processed and used locally. For example the sandstone and granite used in the construction of the Capitol and the White House.
 

Washington DC has almost 1500 miles of streets, avenues, and parkways. However, the proposed highway system through the middle of the city was never started. The metro network in this city is also very robust. It has around 91 stations with around 117 miles of track. The city is also known for having the nation’s fifth-largest bus system.

The metropolitan area is served by three major airports; one in Maryland and two in Virginia. Ronald Reagan Washington National Airport is the closest and is accessible by the Washington Metro. Most major international flights arrive and depart from Washington Dulles International Airport, located 26.3 miles west of the city in Virginia. Dulles is the second busiest international gateway on the East Coast. Baltimore-Washington International Thurgood Marshall Airport is located 31.7 miles (51.0 km) northeast of the city near Baltimore, Maryland.