Manhattan address algorithm

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. The algorithm is given in any print telephone directory as well as on numerous web pages and in New York City guide books .

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:

Street or Avenue	Magic number
Avenue A	+3
Avenue B	+3
Avenue C	+3
Avenue D	+3
1st Ave	+3
2nd Ave	+3
3rd Ave	+10
4th Ave	+8
6th Ave	-12
8th Ave	+9
9th Ave	+13
10th Ave	+14
11th Ave	+15
Amsterdam Ave	+59
Audubon Ave	+165
Ave of the Americas	-12
Columbus Ave	+59 or +60
Convent Ave	+127
Edgecomb Ave	+134
Ft. Washington Ave	+158
Lenox Ave	+110
Lexington Ave	+22
Madison Ave	+27
Manhattan Ave	+100
Park Ave	+34
Park Ave South	+8
Pleasant Ave	+101
St. Nicholas Ave	+110
Wadsworth Ave	+173
West End Ave	+59
York Ave	+4

Special cases

Some streets are special cases:

Fifth Avenue

Building Number	Magic number
63-108	+11
109-200	+13
201-400	+16
401-600	+18
601-775	+20
776-1286	divide by 10 instead of 20 and subtract 18
1310-1329	divide by 10 instead of 20 and subtract 20
1330-1349	divide by 10 instead of 20 and subtract 21
1350-1369	divide by 10 instead of 20 and subtract 22
1370-1389	divide by 10 instead of 20 and subtract 23
1390-1409	divide by 10 instead of 20 and subtract 24
1410-1429	divide by 10 instead of 20 and subtract 25
1430-1449	divide by 10 instead of 20 and subtract 26
1450-1469	divide by 10 instead of 20 and subtract 27
1470-1489	divide by 10 instead of 20 and subtract 28
1490-1494	divide by 10 instead of 20 and subtract 20

Seventh Avenue

Building Number	Magic number
1-1800	+12
Above 1800	+20