Manhattan street addresses follow an algorithm that allows anyone with rudimentary math skills and the following charts to find the nearest cross street for a house number on an avenue.

Take the number of the street address, drop the last digit, divide by two (essentially dividing the address by 20 but accounting for odd numbers), and add or subtract the number in the chart. For example, 945 Madison Avenue (Whitney Museum of American Art, by the way) would yield the following equation:

945 / 2 = 47 + 27 (from the chart below) = 74th Street.
*The entrance is actually closer to 75th Street, but the museum takes up the whole block so it is just as close to 74th Street.

Avenues A, B, C, D: add 3
1st Avenue: add 3
2nd Avenue: add 3
3rd Avenue: add 10
4th Avenue: add 8
5th Avenue

  • 63 - 108: add 11
  • 109 - 200: add 13
  • 201 - 400: add 16
  • 401 - 600: add 18
  • 601 - 775: add 20
  • 776 - 1286: divide by 10 (instead of 20), subtract 18
  • 1287-1500: add 45
  • 1501 - 2000: add 24
    Avenue of the Americas (6th Avenue): subtract 12
    7th Avenue
  • 1 - 1800: add 12
  • 1801 and up: add 20
    8th Avenue: add 9
    9th Avenue: add 13
    10th Avenue: add 14
    11th Avenue: add 15
    Amsterdam Avenue: add 59
    Audubon Avenue: add 165
    Broadway
  • 1-754: unnumbered streets, south of 8th Street
  • 756 - 846: subtract 29
  • 847 - 953: subtract 25
  • above 953: subtract 31
    Central Park West: divide by 10 (not 20), add 60
    Columbus Avenue: add 60
    Lenox Avenue: add 110
    Lexington Avenue: add 22
    Madison Avenue: add 27
    Manhattan Avenue: add 100
    Park Avenue: add 35
    Park Avenue South: add 8
    Pleasant Avenue: add 101
    St. Nicholas Avenue: add 110
    Riverside Drive
  • 1 - 567: divide by 10 (not 20), add 72
  • above 567: divide by 10 (not 20), add 78
    Wadsworth Avenue add 173
    West End Avenue: add 60
    York Avenue: add 4
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