The Manhattan address algorithm is used to estimate the number of the closest cross street for a given building number on the island of Manhattan

Manhattan

Manhattan is the oldest and the most densely populated of the five boroughs of New York City. Located primarily on the island of Manhattan at the mouth of the Hudson River, the boundaries of the borough are identical to those of New York County, an original county of the state of New York...

. The algorithm is given in any print telephone directory

Telephone directory

A telephone directory is a listing of telephone subscribers in a geographical area or subscribers to services provided by the organization that publishes the directory...

  as well as on numerous web pages and in New York City

New York City

New York is the most populous city in the United States and the center of the New York Metropolitan Area, one of the most populous metropolitan areas in the world. New York exerts a significant impact upon global commerce, finance, media, art, fashion, research, technology, education, and...

 guide book

Guide book

A guide book is a book for tourists or travelers that provides details about a geographic location, tourist destination, or itinerary. It is the written equivalent of a tour guide...

s .

Algorithm

To find the approximate number of the closest cross street, divide the building number by 20 and add (or subtract) the "magic number" from the table below:

3

3

3

3

3

3

10

8

9

13

14

15

59

165

59 or +60

127

134

158

110

22

27

100

34

8

101

110

42

173

59

4

Street or Avenue	Magic number
Avenue A
Avenue B
Avenue C
Avenue D
1st Ave
2nd Ave
3rd Ave
4th Ave
6th Ave
8th Ave
9th Ave
10th Ave
11th Ave
Amsterdam Ave
Audubon Ave
Ave of the Americas
Columbus Ave
Convent Ave
Edgecomb Ave
Ft. Washington Ave
Lenox Ave
Lexington Ave
Madison Ave
Manhattan Ave
Park Ave
Park Ave South
Pleasant Ave
St. Nicholas Ave
Vanderbilt Ave
Wadsworth Ave
West End Ave
York Ave

Special cases

Some streets are special cases:

Fifth Avenue

11

13

16

18

20

45

24

Building Number	Magic number
63-108
109-200
201-400
401-600
601-775
776-1286	divide by 10 instead of 20 and subtract 18
1300-1500
Above 2000

Seventh Avenue

12

20

Building Number	Magic number
1-1800
Above 1800

Broadway

Building Number	Magic number
1-754	no numbered streets, south of 8th street
756-846
847-953
Above 953

Riverside

Building Number	Magic number
1-567	divide by 10 instead of 20 and add 72
Above 567	divide by 10 instead of 20 and add 78

Central Park West

Building Number	Magic number
All	divide by 10 instead of 20 and add 60