House numbering
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House numbering is the system of giving a unique number to each building in a street or area, with the intention of making it easier to locate a particular building. The house number is often part of a postal address.
House numbering schemes vary by place, and in many cases even within cities. In some, usually remote, areas of the world, houses are not numbered at all, instead simply being named.
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[edit] Australia
In Australia, most addresses follow the European scheme (odd numbers on the left side, as viewed from the datum point at the start of the road, and even numbers on the right). On very long urban roads (e.g. Parramatta Road in Sydney) numbers will typically ascend until the road crosses a council or suburb boundary, then commence again at 1 or 2. Long roads can thus have several occurrences of each number. In rural areas, where houses and farms are widely spaced, a numbering system based on hundredths of kilometres has been devised. Thus a farm 2300m from the start of the road, on the right-hand side would be numbered 230. [1]
[edit] Europe
In Europe the most common house numbering scheme is to number each plot on one side of the road with ascending odd numbers, from 1, and those on the other with ascending even numbers, from 2, or sometimes 0. The odd numbers are usually on the left side of the road, looking in the direction in which the numbers increase. Where additional buildings are inserted or subdivided, these are often suffixed a, b, etc (In Spain and France, bis, ter, quater). Where buildings are later combined, they may use just one of the original numbers, or give their address as a range (e.g. "13‑17"). Note that in this example, this range includes numbers 13,15, and 17, and does not include numbers 14 and 16 (two adjoining lots might give "13/15" for clarity sake). Where some plots are not built upon, there may be considerable gaps in the numbering scheme. If a lot of buildings are later built along a stretch of the street, either a range of unused numbers above the current highest house number may be used, introducing confusing discontinuities, or the remainder of the street must be renumbered.
In Britain the even numbers will typically, although not always, be on the left-hand side as one moves away from the centre of the town or village, with the lowest numbers at the end of the street closest to the town centre. Intermediate properties usually have a number suffixed A, B, C, etc, but there are several that have been given a half number, e.g. the old police station at 20½ Camberwell Church Street. At least one property (built next to no.2 after the street had been numbered) has been numbered zero.
Before the early/mid nineteenth century, it was common in England for numbering to proceed sequentially along one side of the road and then back down the other (in a similar way to "boustrephedon" writing). Subsequent changes to local numbering can present pitfalls to researchers using historic street directories, for instance.
This approach, numbering all plots on one side of a street consecutively, continuing clockwise back down on the opposite side of the street still exists, for example in Pall Mall, culs-de-sac, streets with buildings only on one side and in many Welsh villages. For instance, 10 Downing Street, the official home of the First Lord of the Treasury (usually the Prime Minister), is next door to 11 Downing Street, the home of the Second Lord of the Treasury (usually the Chancellor of the Exchequer).
Houses which surround squares are usually numbered consecutively clockwise.
In more modern housing estates it's common for streets to skip number 13, because that number is considered unlucky.
In Germany, houses are typically numbered in the European style. Many streets in Berlin and some other municipalities, however, use the "boustrephedon" system described above.
In Venice, houses are numbered within districts known as sestieri, resulting in just six series for the entire city; in Florence houses are given black numbers and businesses red numbers, resulting in just two series.
In Prague and other Czech cities, two numbering systems are used concurrently. Buildings display both a číslo popisné (descriptive number) in red and a číslo orientační (orientation number) in blue or black. The red number is unique to the building in its section of town and may not be concurrent with addresses of nearby buildings. The blue number is a simple sequential number, similar to the house numbers used in other European cities. Either number may be used in addresses. Sometimes, businesses will use both numbers to avoid confusion, putting the red number first: "Hlavní 20 / 7."
In Sweden, there is also a system (fastighetsbeteckningar) numbering farms and thereby also the houses on them. The numbering is done per village. When a farm is split, either composited numbers (like 2:1 and 2:2) are made to be able differ the farms, or a completely new number, previously unused, can be given to one or both of the farms.
In Haarlem red numbers are used for upstairs apartments.
In Russia and many other former USSR countries, the European style is generally used, with numbers starting from the end of the street closest to the town center. Buildings or plots at street intersections may be assigned a composite number, which includes the number along the intersecting street separated by a slash (дробь), like in "Nakhimova 14/41" (14 is the number along Nakhimova street and 41 is the number along intersecting street).
When a numbered plot contains multiple buildings, they are assigned an additional component of the street address, called корпус (korpus or corpus), which is usually a sequentially assigned number unique within the plot (but sometimes contains letters as in 15a). So, a Russian street address may look like (with street name first, which is the standard way to write addresses in Russia) "Moskovskoye shosse, dom 23 (plot number), korpus 2 (second building within the plot)".
[edit] Japan and Korea
Japan and South Korea use a system where the city is divided into small sections each with its own numeric code. The houses within that zone are then labelled based on the order in which they were constructed, or clockwise around the block. This system is comparable to the system of sestieri (sixths) used in Venice.
[edit] Latin America
In Latin America the addressing system is quite similar to the one used in United States and rest of the world. Houses are numered in an ascendent order from downtown to the border of the city. Usually the cities are divided in Colonias, which are small or medium areas. The colonia is commonly included in the address before the postal code. Sometimes when houses merge in a street or new constructions are built after the numbering was made, the address can become ambiguous. When a number is repeated a letter is added to the newest house. For example, if there are two 35's, one remains as 35 and the second one becomes 35A or 35Bis.
It is sometimes common that in remote towns or non-planned areas inside the cities that the streets do not have any name and the houses do not have numbers. In these cases the address of the houses are usually the name of the person or family, the name of the area or town, and "Dirección Conocida" (Known Address), which means that the house of the family is known by almost all the community. This kind of addressing is only used in remote towns or small communities near highways.
For people living near highways or roads the usual address is the kilometer of the road in which the house is established; if there's more than one, some references might be written or the "Dirección Conocida" may be added.
[edit] United States of America
In much of North America, buildings are not numbered according to a simple sequence but rather according to distance from a given baseline. As a result, four- and five-digit addresses are common. Odd numbers are typically on one side of the street, evens on the other. In New England and the New York Metropolitan Area, however, a simple sequence is used much like that in European cities.
In cities with a grid plan of streets, addresses often increase by 100 for each cross street. Addresses may also correlate with a street-numbering system. Thus, in Cleveland, Ohio, a building with the address 900 Euclid Avenue would be at the corner of Euclid Avenue and 9th Street.
In San Francisco, parallel streets will sometimes be numbered in opposite directions. As an example, Broderick Street numbers ascend from south to north, while Masonic Avenue, just three blocks away, ascends from north to south.
Along the Overseas Highway in the Florida Keys, house numbers indicate their distance from Mile Marker 0 in Key West. The mileage is found by dividing the house number by one thousand (for example, 77220 Overseas Highway is 77.2 miles from Mile Marker 0).
Buildings in many rural areas in the United States used to lack these kind of addresses. Instead, an old rural address might have been simply "Rural route 3, Box 15." However, the adoption of 9-1-1 emergency systems has required the adoption of street names and house numbers in rural areas.
In areas of rural Wisconsin, the address layout of many counties features a baseline in one corner of the county, with numbers increasing from that point and appended with a cardinal direction; for instance, an address on a north-south road 45 blocks north from the baseline is written as 'N4500', while an address 45 blocks west from the baseline on a east-west road is shown as 'W4500'. Some counties and suburban communities (such as Waukesha and the Town and City of Cedarburg) use a two-part address for both directions for easier referencing within a map and the numbering system (N4500-W4500 for instance).
Carmel-by-the-Sea, California lacks any house numbering whatsoever. Houses are referred to, instead, as (for example) "Junipero 3 SW of 10th", meaning "The third house on the west side of Junipero south of 10th."
[edit] Block numbers
Block numbers are a system of assigning numbers based on distance rather than strictly sequentially. Typically, each block is assigned 100 numbers, such that the building numbers on that block vary only in the two least significant digits. For example, in Washington, D.C., the block of 7th Street, N.W., between D and E streets, N.W., is designated as the 400 block, meaning that building numbers on that block are in the range from 400 to 499 inclusive. It is common to indicate block numbers on street signs.
Some localities, such as the Borough of Queens in New York City, use a block numbering system in which a hyphen separates the hundreds digit from the tens digit. For example, a building number that might elsewhere be written 16709 is instead written 167-09. In most cases, the first number refers to the street, avenue, drive, etc. where the numbering begins. For example 99-40 63rd Road is numbered because the starting point was 99th Street. Likewise, an address on a perpendicular block would have its number starting with 63-XX. In Queens (unlike other areas, such as Los Angeles, where one may see numbers such as 16700 Sunset Blvd.) rarely is the 00 number used to refer to an address, but rather the numbering starts at -01 or -02 depending on the side of the block.
Some localities in Utah and Wisconsin have a more elaborate system of block numbering.[1][2] Such localities use compound block numbers to indicate the number of blocks from both the north-south and the east-west dividing lines. For example, an address in Utah might be of the form "226 N 3300 W" where other systems might use "226 33rd Ave NW". Such an address is in the northwest quadrant of the addressing system. Another system, used in Wisconsin, might use "N112 W16709 Mequon Rd" rather than "16709 W. Mequon Rd". This numbering system is based on the southeast corner of each county and is based on a grid that will increase when traveling in a northerly or westerly direction using N and W, respectively.[3] In Illinois, specifically in the Collar Counties surrounding Chicago, addresses in unincorporated and newly annexed areas are given according to their placement in a 1-square-mile quadrant relative to downtown Chicago. North-south streets use an address number beginning in N or S, and east-west streets use an address number beginning in W. The three-digit unique number that follows is assigned according to distance from the beginning of the quadrant. For example, "30W221 Butterfield Road" is in Naperville, 30 miles west of downtown Chicago.
[edit] Taiwan
Taiwan's "61, Alley 351, Lane 410, Gongguan St." allows direct navigation from Gongguan St., whereas in North America, one would need to know where the intervening, say, Jefferson Lane and Williams Alley were.[4]
The above navigation being: on Gongguan St. turn right the lane at at house number 410, then left at the alley at house number 351, proceed to house number 61.
