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Manhattan address algorithm
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The Manhattan address algorithm is a series of formulas used to estimate the closest east–west cross street for building numbers on north–south avenues in the New York City borough of Manhattan.
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To find the approximate number of the closest cross street, divide the building number by a divisor (generally 20) and add (or subtract) the "tricky number" from the table below:[1][2][3]
For the north–south avenues, there are typically 20 address numbers between consecutive east–west streets (10 on either side of the avenue). A standard land lot on each avenue was originally 20 feet (6.1 m) wide,[4] and there is about 200 feet (61 m) between each pair of east–west streets, for ten land lots between each pair of streets.[5] The exceptions are Riverside Drive, as well as Fifth Avenue and Central Park West between 59th and 110th streets, which use a divisor of 10.[3] These avenues all have buildings only on one side of the street, with a park on the other side.[6]
The "tricky number" often corresponds to a street near the southern end of the avenue.[6] There are some notable exceptions:
- York Avenue address numbers are continuations of Avenue A address numbers, since the avenue was originally called Avenue A.[7]
- East End Avenue address numbers are continuations of Avenue B address numbers, since the avenue was originally called Avenue B.[7]
- Sixth Avenue and Broadway start south of Houston Street, the southern boundary of the Manhattan street numbering system.[6]
- Although Park Avenue's southern terminus is at 32nd Street, a homeowner at 34th Street wanted the address "1 Park Avenue" (this was later changed).[8]
Examples
For example, if you are at 62 Avenue B, , then add the "tricky number" to give . The nearest cross street to 62 Avenue B is East 6th Street.
If you are at 78 Riverside Drive, , then add the "tricky number" to give . The nearest cross street to 78 Riverside Drive is West 80th Street.
If you are at 501 5th Avenue, , then add the "tricky number" to give . The nearest cross street to 501 5th Avenue is actually 42nd Street, not 43rd Street, as the Manhattan address algorithm only gives approximate answers.
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