Square mile

The square mile (abbreviated as sq mi and sometimes as mi²)[1] is an imperial and US unit of measure for an area equal to the area of a square with a side length of one statute mile.[2] It should not be confused with miles square, which refers to a square region with each side having the specified length. For instance, 20 miles square (20 × 20 miles) has an area equal to 400 square miles; a rectangle of 10 × 40 miles likewise has an area of 400 square miles, but it is not 20 miles square.

One square mile is equal to:

Since one inch has been standardized to 2.54 cm by international agreement, a square mile is equivalent to the following metric measures:

When applied to a portion of the earth's surface, "square mile" is an informal synonym for section.

Romans derived measurements from marching. Five feet was equal to one pace (which is appropriately a double step). One thousand paces measured a Roman mile, which was somewhat smaller than the English statute mile. This Roman system was adopted, with local variations, throughout Europe as the Roman Empire spread.[5]

Total population in a square mile is derived by dividing the total number of residents by the number of square miles of land area in the specified geographic area. The population per square kilometer is derived by multiplying the population per square mile by 0.3861.[6]

Land area measurements are originally recorded as whole square meters. Square meters are converted to square kilometers by dividing by 1,000,000; square kilometers are converted to square miles by dividing by 2.58999; square meters are converted to square miles by dividing by 2,589,988.[6]


  1. ^ a b Rowlett, Russ (September 1, 2004). "S", How Many? A Dictionary of Units of Measurement. University of North Carolina at Chapel Hill. Retrieved February 22, 2012.
  2. ^ Davies, Charles (1872). Mathematical dictionary and cyclopedia of mathematical science. Original from Harvard University: A.S. Barnes and co. p. 582.
  3. ^ a b c François Cardarelli (2003). Encyclopaedia of scientific units, weights, and measures: their SI equivalences and origins. Springer. p. 3. ISBN 978-1-85233-682-0. Retrieved 22 February 2012.
  4. ^ Zupko, Ronald Edward (1985). A dictionary of weights and measures for the British Isles: the Middle Ages to the twentieth century. American Philosophical Society. p. 353. ISBN 978-0-87169-168-2. Retrieved 22 February 2012.
  5. ^ "The history of measurement". Retrieved 9 August 2015.
  6. ^ a b "Land Area and Persons Per Square Mile". Census.gov. Retrieved 9 August 2015.

The acre is a unit of land area used in the imperial and US customary systems. It is traditionally defined as the area of one chain by one furlong (66 by 660 feet), which is exactly equal to 10 square chains, ​1⁄640 of a square mile, or 43,560 square feet, and approximately 4,047 m2, or about 40% of a hectare.

The acre is a statute measure in the United States and was formerly one in the United Kingdom and almost all countries of the former British Empire, although informal use continues.

The international symbol of the acre is ac. In the United States both the international acre and the US survey acre are in use, but they differ by only two parts per million: see below. The most common use of the acre is to measure tracts of land. The acre, based upon the International yard and pound agreement of 1959, is defined as exactly 4,046.8564224 square metres.

Traditionally, in the Middle Ages, an acre was defined as the area of land that could be ploughed in one day by a yoke of oxen.

Arcadia University, Pennsylvania

Arcadia University is a census-designated place located in Cheltenham Township, Montgomery County in the state of Pennsylvania. Its location is just off campus at Arcadia University off Pennsylvania Route 309. As of the 2010 census the population was 595 residents.

At 10,438 people per square mile, Arcadia University is the most densely populated census-designated place in Montgomery County, and 33rd in the entire United States. It is one of only two places in Montgomery County that has over 10,000 people per square mile (the other is Conshohocken). This is attributed to the land area consisting mostly of college dormitories.

Arcadia University is home to National Historic Landmark Grey Towers Castle which serves as the main administration building for Arcadia University.

Central Los Angeles

Central Los Angeles is a 57.87-square-mile (149.88 km²) region of Los Angeles County, California, comprising twenty-three neighborhoods within the city of Los Angeles, as well as Griffith Park, the city's largest public park.

City of London

The City of London is a city and county that contains the historic centre and the primary central business district (CBD) of London. It constituted most of London from its settlement by the Romans in the 1st century AD to the Middle Ages, but the agglomeration has since grown far beyond the City's borders. The City is now only a tiny part of the metropolis of London, though it remains a notable part of central London. Administratively, it forms one of the 33 local authority districts of Greater London; however, the City of London is not a London borough, a status reserved for the other 32 districts (including London's only other city, the City of Westminster). It is also a separate county of England, being an enclave surrounded by Greater London. It is the smallest county in the United Kingdom.

The City of London is widely referred to simply as the City (differentiated from the phrase "the city of London" by capitalising City) and is also colloquially known as the Square Mile, as it is 1.12 sq mi (716.80 acres; 2.90 km2) in area. Both of these terms are also often used as metonyms for the United Kingdom's trading and financial services industries, which continue a notable history of being largely based in the City. The name London is now ordinarily used for a far wider area than just the City. London most often denotes the sprawling London metropolis, or the 32 London boroughs, in addition to the City of London itself. This wider usage of London is documented as far back as 1888, when the County of London was created.The local authority for the City, namely the City of London Corporation, is unique in the UK and has some unusual responsibilities for a local council, such as being the police authority. It is also unusual in having responsibilities and ownerships beyond its boundaries. The Corporation is headed by the Lord Mayor of the City of London, an office separate from (and much older than) the Mayor of London. The Lord Mayor, as of November 2018, is Peter Estlin.The City is a major business and financial centre. Throughout the 19th century, the City was the world's primary business centre, and it continues to be a major meeting point for businesses. London came top in the Worldwide Centres of Commerce Index, published in 2008. The insurance industry is focused around the eastern side of the City, around Lloyd's building. A secondary financial district exists outside the City, at Canary Wharf, 2.5 miles (4 km) to the east.

The City has a resident population of 9,401 (ONS estimate, mid-2016) but over 400,000 people commute to and work there. About three quarters of the jobs in the City of London are in the financial, professional, and associated business services sectors. The legal profession forms a major component of the northern and western sides of the City, especially in the Temple and Chancery Lane areas where the Inns of Court are located, of which two—Inner Temple and Middle Temple—fall within the City of London boundary.

Cleveland, Virginia

Cleveland is a town in Russell County, Virginia, United States. The population was 128 at the 2010 census.

Clinch County, Georgia

Clinch County is a county located in the U.S. state of Georgia. As of the 2010 census, the population was 6,798. The county seat is Homerville. The county was created on February 14, 1850, named in honor of Duncan Lamont Clinch.With just 8.5 people per square mile (land), Clinch has one of the lowest population densities of any county in Georgia.

Garfield County, Washington

Garfield County is a county located in the U.S. state of Washington. As of the 2010 census, the population was 2,266, making it the least populous county in Washington; with about 3.2 inhabitants per square mile (1.2/km2), it is also the least densely populated county in Washington. The county seat and only city is Pomeroy.

Golden Square Mile

The Square Mile and also known as the Golden Square Mile (officially in French: Le Mille Carré and also known as Mille carré doré) is the nostalgic name given to an urban neighbourhood developed principally between 1850 and 1930 at the foot of Mount Royal, in the west-central section of downtown Montreal, Quebec, Canada. The name "Square Mile" has been used to refer to the area since the 1930s; prior to that, the neighborhood was known as 'New Town' or 'Uptown'. The addition of 'Golden' was coined by Montreal journalist Charlie Lazarus, and the name has connections to contemporary real-estate developments, as the historical delimitations of the Golden Square Mile overlap with Montreal's contemporary central business district.

From the 1790s, the business leaders of Montreal looked beyond Old Montreal for spacious sites upon which to build their country homes. They developed the farmland of the slopes of Mount Royal north of Sherbrooke Street, creating a neighborhood notorious for its grandeur and architectural audacity. At the Square Mile's peak (1850-1930), its residents included the owners and operators of the majority of Canadian rail, shipping, timber, mining, fur and banking industries. From about 1870 to 1900, 70% of all wealth in Canada was held by this small group of approximately fifty men.By the 1930s, multiple factors led to the neighborhood's decline, including the Great Depression, the dawn of the automobile, the demand for more heat-efficient houses, and the younger generations of the families that had built these homes largely moved to Westmount. During the Quiet Revolution, some of the businesses created in Montreal, on whose fortunes the Square Mile had been built, moved to Toronto. In this period, the Square Mile evolved to gradually become the central business district, and many of grand houses were demolished. The face of the Square Mile was altered, leading to the formation of Heritage Montreal to preserve architecture in the city.

By 1983, only 30% of the mansions in the northern half of the Square Mile had survived demolition; and only 5% survived south of Sherbrooke Street. Many of the remaining mansions, such as the James Ross House, today known as Chancellor Day Hall, are today owned by McGill University. Nevertheless, the mansions of the Golden Square Mile represent a prosperous period during which Montreal was the cultural and financial capital of Canada.

Hinsdale County, Colorado

Hinsdale County is one of the 64 counties of the U.S. state of Colorado. As of the 2010 census, the population was 843, making it the third-least populous county in Colorado. With a population density of only 0.75 inhabitants per square mile (0.29/km2), it is also the least-densely populated county in Colorado. The county seat and only incorporated municipality in the county is Lake City. The county is named for George A. Hinsdale, a prominent pioneer and former Lieut. Governor of Colorado.

Housatonic Valley

The Housatonic Valley is a geographic region of Connecticut and Massachusetts in the United States, associated with the valley and watershed of the Housatonic River.

The Greater Danbury metropolitan area in western Connecticut is also known as the Housatonic Valley Region.

The Housatonic Valley Watershed spans 1,948 square miles including 83 towns from the Berkshires region of Massachusetts to the Long Island Sound.

The Upper Housatonic Valley National Heritage Area is a designated National Heritage Area consisting of an 848-square-mile (2,200 km2) area in the watershed of the upper Housatonic River, extending from Kent, Connecticut, to Lanesborough, Massachusetts, including eight towns in Connecticut and eighteen in Massachusetts.

Los Angeles Harbor Region

The Los Angeles Harbor Region is a 193.09-square-mile area in Los Angeles County, California, which includes thirteen neighborhoods or cities.

Miami metropolitan area

The Miami metropolitan area, also known as the Greater Miami Area or South Florida, is the 73rd largest metropolitan area in the world and the seventh-largest metropolitan area in the United States. It is entirely in the southern portion of the U.S. state of Florida. With 6,158,824 inhabitants as of 2017, the Miami metropolitan area is the most populous in Florida and second largest in the southeastern United States, extending some 120 miles from north to south.

The metropolitan area is defined by the Office of Management and Budget as the Miami–Fort Lauderdale–West Palm Beach, FL (MSA), consisting of Miami-Dade, Broward, and Palm Beach counties, a metropolitan statistical area used for statistical purposes by the United States Census Bureau and other agencies. Its land area is 6,137 sq. mi (15,890 km2).

Miami-Dade, Broward, and Palm Beach counties are the first, second, and third most populous counties in Florida, and Miami-Dade, with 2,751,796 people in 2017, is the seventh most populous county in the United States. The three counties together have principal cities including Miami, Fort Lauderdale, Pompano Beach, West Palm Beach, and Boca Raton. Besides its association with the South Florida region, is also partially synonymous with an area known collectively as the "Gold Coast".

The Census Bureau also defines a wider region based on commuting patterns, the Miami–Fort Lauderdale–Port St. Lucie, FL Combined Statistical Area (CSA), also known as the Greater Miami Area, with an estimated population of 6,723,472 in 2016. This includes the four additional counties of Martin, St. Lucie, Indian River, and Okeechobee.Because the population of South Florida is largely confined to a strip of land between the Atlantic Ocean and the Everglades, the Miami urbanized area (that is, the area of contiguous urban development) is about 100 miles (160 km) long (north to south), but never more than 20 miles (32 km) wide, and in some areas only 5 miles (8.0 km) wide (east to west). The Miami metropolitan statistical area is longer than any other urbanized area in the United States except for the New York metropolitan area. It was the eighth most densely populated urbanized area in the United States in the 2000 census.As of the 2000 census, the urbanized area had a land area of 1,116 square miles (2,890 km2), with a population of 4,919,036, for a population density of 4,407.4 per square mile (1,701.7 per square kilometer). Miami and Hialeah (the second largest city in the metropolitan area) had population densities of more than 10,000 per square mile (more than 3,800 per square kilometer). The Miami Urbanized Area was the fourth largest urbanized area in the United States in the 2010 census.

The Miami metropolitan area also includes several urban clusters (UCs) as of the 2000 Census which are not part of the Miami Urbanized Area. These are the Belle Glade UC, population 24,218, area 20,717,433 square meters and population density of 3027.6 per square mile; Key Biscayne UC, population 10,513, area 4,924,214 square meters and population density of 5529.5 per square mile; Redland UC, population 3,936, area 10,586,212 square meters and population density of 963.0 per square mile; and West Jupiter UC, population 8,998, area 24,737,176 square meters and population density of 942.1 per square mile.

Northeast Los Angeles

Northeast Los Angeles is a 17.18-square-mile region of Los Angeles County, comprising seven neighborhoods within the City of Los Angeles. The area is home to Occidental College located in Eagle Rock.


Pinseque is a municipality located in the province of Zaragoza, Aragon, Spain. According to the 2014 census (INE), the municipality has a population of 3,625 inhabitants, with a population density of 224.88 people per km² (582.4 per square mile).


SIGMET, or Significant Meteorological Information AIM 7-1-5 , is a weather advisory that contains meteorological information concerning the safety of all aircraft. There are two types of SIGMETs: convective and non-convective.

The criteria for a non-convective SIGMET to be issued are severe or greater turbulence over a 3,000-square-mile (7,800 km2) area, severe or greater icing over a 3,000-square-mile (7,800 km2) area or IMC over a 3,000-square-mile (7,800 km2) area due to dust, sand, or volcanic ash.

This information is usually broadcast on the ATIS at ATC facilities, as well as over VOLMET stations. They are assigned an alphabetic designator from N through Y (excluding S and T). SIGMETs are issued as needed, and are valid up to four hours. SIGMETS for hurricanes and volcanic ash outside the CONUS are valid up to six hours.A Convective SIGMET is issued for convection over the Continental U.S. Convective SIGMETs are issued for an area of embedded thunderstorms, a line of thunderstorms, thunderstorms greater than or equal to VIP level 4 affecting 40% or more of an area at least 3000 square miles, and severe surface weather including surface winds greater than or equal to 50 knots, hail at the surface greater than or equal to 3/4 inches in diameter, and tornadoes. Severe thunderstorms are characterized by tornado(s), hail 3/4 inches or greater, or wind gusts 50 knots or greater. A Convective SIGMET is valid for 2 hours and they are issued hourly at Hour+55.

Serra da Saudade

Serra da Saudade is a Brazilian municipality located in the center of the state of Minas Gerais. Its population as of 2007 was 825 people living in a total area of 3.36 km2 (1.30 sq mi), making it the smallest municipality of Brazil. The population density is 256.84/km2 (668.99/square mile). The city belongs to the meso-region of Central Mineira and to the micro-region of Bom Despacho. It became a municipality in 1962.

South Los Angeles

South Los Angeles is a region in southern Los Angeles County, California, and mostly lies within the city limits of Los Angeles, California, just south of downtown.According to the Los Angeles Times, South Los Angeles (formerly known as South-Central) is defined on Los Angeles city maps as a 16-square-mile rectangle with two prongs at the south end.” In 2003, the Los Angeles City Council renamed this area "South Los Angeles."The name South Los Angeles can also refer to a larger 51-square mile area that includes areas within the city limits of Los Angeles as well as unincorporated areas in the southern portion of the County of Los Angeles. Depending on the source, the specific boundary of South Los Angeles can differ.

Square kilometre

Square kilometre (International spelling as used by the International Bureau of Weights and Measures) or square kilometer (American spelling), symbol km2, is a multiple of the square metre, the SI unit of area or surface area.

1 km2 is equal to:

1,000,000 square metres (m2)

100 hectares (ha)It is also approximately equal to:

0.3861 square miles

247.1 acres Conversely:

1 m2 = 0.000001 (10−6) km2

1 hectare = 0.01 (10−2) km2

1 square mile = 2.5899km2

1 acre = about 0.004047km2 The symbol "km2" means (km)2, square kilometre or kilometre squared and not k(m2), kilo–square metre. For example, 3 km2 is equal to 3×(1,000m)2 = 3,000,000 m2, not 3,000 m2.

Survey township

Survey township, sometimes called Congressional township, as used by the United States Public Land Survey System, refers to a square unit of land, that is nominally six (U.S. Survey) miles (~9.7 km) on a side. Each 36-square-mile (~93 km2) township is divided into 36 one-square-mile (~2.6 km2) sections, that can be further subdivided for sale, and each section covers a nominal 640 acres (2.6 km2). The townships are referenced by a numbering system that locates the township in relation to a principal meridian (north-south) and a base line (east-west). For example, Township 2 North, Range 4 East is the 4th township east of the principal meridian and the 2nd township north of the base line. Township (exterior) lines were originally surveyed and platted by the US General Land Office using contracted private survey crews. Later survey crews subdivided the townships into sections (interior) lines. Virtually all lands covered by this system were sold according to these boundaries. They are marked on the U.S. Geological Survey topographic maps.

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