Grid Point Code

Play

San Francisco

CaliforniaUnited States

With a code
#FX344-KNJD7
Said aloud
San Francisco KNJD7

Get the code for your door

What the code says

The Grid Point Code for San Francisco is #FX344-KNJD7. It names a cell 2.56 m north to south and 2.70 m east to west, centred on 37°46'29.72"N, 122°25'09.95"W, and it turns back into that cell on any phone or computer by arithmetic alone: no network, no account, no lookup table.

The point used is the one GeoNames records for San Francisco, near its centre.

Code
#FX344-KNJD7
With a check character
#FX344-KNJD7*F
Short form
KNJD7
Cell centre
37.774921, -122.419430
Cell size
2.56 m by 2.70 m
Region
California
Country
United States
Population
827,526

How to give this address

On a sign, a form or a delivery note

The whole code, #FX344-KNJD7. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in California

San Francisco KNJD7: a name both people know, then the last five characters. They give back the exact code for anywhere within 4.0 km north or south and 4.2 km east or west of San Francisco. Further away the same five name somewhere else, which is why the whole code is what goes on a sign.

Copied by hand, or read over a phone

#FX344-KNJD7*F. The character on the end catches any single mistyped symbol and any two neighbours swapped.

As a link or a square code

Open it on the map, move to the exact door, and add directions if the code needs help: "blue gate, second floor". The link and the square code carry them. Nothing is kept on this site.

From the city to the door

The first four characters name a cell about 40 km by 42.2 km here. Each one after that picks one of 25 inside the last, so the whole ten name a spot about the size of a doorway.

  1. FX34Metropolitan area40 km by 42.2 km
  2. FX344District8 km by 8.45 km
  3. FX344KSuburb1.6 km by 1.69 km
  4. FX344KNA few streets320 m by 338 m
  5. FX344KNJBuilding64 m by 67.6 m
  6. FX344KNJDEntrance12.8 m by 13.5 m
  7. FX344KNJD7Doorway2.56 m by 2.7 m

More in United States

City, region and population from GeoNames, under CC BY 4.0.