371 Subfield $a - Address:

Subfield $a contains all address information preceding the name of the city or town.  The subfield can also contain information indicating that no address information is available.  Subfield $a is repeated to indicate separations of address information.

Example:

100  1#  $aSmith, Arthur

371  ##  $aBox 1216$bBarrière$dCanada$eV0E 1E0