| circle = | post office |
| triangle = | discontinued post office |
| square = | no post office |
| [-- = | beginning of route |
| --] = | end of route |
| - - - - = | special delivery |
| ___m___ = | mail messenger |
| +-+-+-+ = | rural delivery |
| ....... = | once per week |
| - - - - = | twice per week |
| _______ (brown) = | three times per week |
| _______ (black) = | six times per week | |  |