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 [1] as well as on numerous web pages and in New York City guide books.[2]
Algorithm
To find the approximate number of the closest cross street, divide the building number by a divisor (generally 20) and add (or subtract) the "magic number" from the table below:
| Street/Avenue | Building Number | Divisor | Magic number |
|---|---|---|---|
| Avenue A | All | ÷20 | +3 |
| Avenue B | All | ÷20 | +3 |
| Avenue C | All | ÷20 | +3 |
| Avenue D | All | ÷20 | +3 |
| 1st Ave | All | ÷20 | +3 |
| 2nd Ave | All | ÷20 | +3 |
| 3rd Ave | All | ÷20 | +10 |
| 4th Ave | All | ÷20 | +8 |
| 5th Avenue | 63–108 | ÷20 | +11 |
| 5th Avenue | 109–200 | ÷20 | +13 |
| 5th Avenue | 201–400 | ÷20 | +16 |
| 5th Avenue | 401–600 | ÷20 | +18 |
| 5th Avenue | 601–775 | ÷20 | +20 |
| 5th Avenue | 776–1286 | ÷10 | -18 |
| 5th Avenue | 1300–1500 | ÷20 | +45 |
| 5th Avenue | Above 2000 | ÷20 | +24 |
| 6th Ave | All | ÷20 | -12 |
| 7th Avenue | 1–1800 | ÷20 | +12 |
| 7th Avenue | Above 1800 | ÷20 | +20 |
| 8th Ave | All | ÷20 | +9 |
| 9th Ave | All | ÷20 | +13 |
| 10th Ave | All | ÷20 | +14 |
| 11th Ave | All | ÷20 | +15 |
| Amsterdam Ave | All | ÷20 | +59 |
| Audubon Ave | All | ÷20 | +165 |
| Ave of the Americas | All | ÷20 | -12 |
| Columbus Ave | All | ÷20 | +59 or +60[clarification needed] |
| Convent Ave | All | ÷20 | +127 |
| Edgecombe Ave | All | ÷20 | +134 |
| Ft. Washington Ave | All | ÷20 | +158 |
| Lenox Ave | All | ÷20 | +110 |
| Lexington Ave | All | ÷20 | +22 |
| Madison Ave | All | ÷20 | +27 |
| Manhattan Ave | All | ÷20 | +100 |
| Park Ave | All | ÷20 | +34 |
| Park Ave South | All | ÷20 | +8 |
| Pleasant Ave | All | ÷20 | +101 |
| St. Nicholas Ave | All | ÷20 | +110 |
| Vanderbilt Ave | All | ÷20 | +42 |
| Wadsworth Ave | All | ÷20 | +173 |
| West End Ave | All | ÷20 | +59 |
| York Ave | All | ÷20 | +4 |
| Broadway | 1–754 | N/A | (no numbered streets, south of 8th street) |
| Broadway | 756–846 | ÷20 | -29 |
| Broadway | 847–953 | ÷20 | -25 |
| Broadway | Above 953 | ÷20 | -31 |
| Riverside Drive | 1–567 | ÷10 | +72 |
| Riverside Drive | Above 567 | ÷10 | +78 |
| Central Park West | All | ÷10 | +60 |