Lyon

Auvergne-Rhône-AlpesFrance

With a code: #PXTHX-F22DK
Said aloud: Lyon F22DK

What the code says

The Grid Point Code for Lyon is #PXTHX-F22DK. It names a cell 2.56 m north to south and 2.39 m east to west, centred on 45°44'56.63"N, 4°50'52.36"E, 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 Lyon, near its centre.

Code: #PXTHX-F22DK
With a check character: #PXTHX-F22DK*H
Short form: F22DK
Cell centre: 45.749065, 4.847877
Cell size: 2.56 m by 2.39 m
Region: Auvergne-Rhône-Alpes
Country: France
Population: 520,774

How to give this address

On a sign, a form or a delivery note: The whole code, #PXTHX-F22DK. It needs nothing else: no city, no street, no network to read it back.
Said aloud, in Auvergne-Rhône-Alpes: Lyon F22DK: 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 3.7 km east or west of Lyon. 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: #PXTHX-F22DK*H. 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 37.3 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.

PXTHMetropolitan area40 km by 37.3 km
PXTHXDistrict8 km by 7.46 km
PXTHXFSuburb1.6 km by 1.49 km
PXTHXF2A few streets320 m by 298 m
PXTHXF22Building64 m by 59.7 m
PXTHXF22DEntrance12.8 m by 11.9 m
PXTHXF22DKDoorway2.56 m by 2.39 m

More in France

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