Grid Point Code

Play

South Boston

MassachusettsUnited States

With a code
#G49GC-XT2G8
Said aloud
South Boston XT2G8

Get the code for your door

What the code says

The Grid Point Code for South Boston is #G49GC-XT2G8. It names a cell 2.56 m north to south and 2.53 m east to west, centred on 42°20'00.35"N, 71°02'58.12"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 South Boston, near its centre.

Code
#G49GC-XT2G8
With a check character
#G49GC-XT2G8*0
Short form
XT2G8
Cell centre
42.333431, -71.049477
Cell size
2.56 m by 2.53 m
Region
Massachusetts
Country
United States
Population
571,281

How to give this address

On a sign, a form or a delivery note

The whole code, #G49GC-XT2G8. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Massachusetts

South Boston XT2G8: 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 3.9 km east or west of South Boston. 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

#G49GC-XT2G8*0. 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 39.5 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. G49GMetropolitan area40 km by 39.5 km
  2. G49GCDistrict8 km by 7.9 km
  3. G49GCXSuburb1.6 km by 1.58 km
  4. G49GCXTA few streets320 m by 316 m
  5. G49GCXT2Building64 m by 63.2 m
  6. G49GCXT2GEntrance12.8 m by 12.6 m
  7. G49GCXT2G8Doorway2.56 m by 2.53 m

More in United States

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