Prepositions of Place: at, in, on

Generally, we use:

• at for a POINT
• in for an ENCLOSED SPACE
• on for a SURFACE

Example:

• I live on the 7th floor at 21 Oxford Street in London.
• The shop is at the end of the street.
• I have a meeting in New York.
• There was a “no smoking” sign on the wall.

Look at these standard expressions: