2474. Why would you always be able to find these characters? 前 宅 郵 域 碑

They represent things found on a map or used to navigate.  

前  ZEN, mae  - before; used in location names as "in front of"

宅  TAKU - home, residence

郵  YUU - mail (post office)

域  IKI - region, area

碑  HI - tombstone, monument