Related Clues:
- Park in NYC, for one
- Envelope routing abbr
- Michigan, e.g., in Chicago: Abbr
- Memo inits
- Short line on a map?
- See 17-Across: Abbr
- Abbr. on a street sign
- Salutation for Caesar
- NYC's Madison or Fifth
- McKinney or Greenville, in Dallas (Abbr.)
- Addr. line ending
- Abbr. before a recipient's name
- Envelope-directing abbr
- Not a st., not a blvd, the other one
- Mail abbreviation