City Directory Abbreviations

What do "rt" and "bx" mean in city directories?
(e.g. Doe, John M h Cleveland blvd rt 4 bx 2734)
Answers
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The US Postal Service designates Rural Route Addresses for a city using a Route number and a Box number.
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If it is used often, maybe those could be added to the list at the "What to Remember about this Project" in the Project Instructions? Learning something new every day.
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@Katherine Huie, given that addresses aren't indexed in this project, abbreviations used in addresses would just be a distraction in the instructions.
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@Julia Szent-Györgyi I'd actually disagree here. Because I didn't know what those meant, I wasn't sure if they were a residence or a business abbreviation. The project instructions say not to index names associated with businesses but to do so for residences. Getting confirmation that it is a reference to a residence meant I was supposed to index it.
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@Alan E. Brown Thank you! I had seen them on other city directories but couldn't figure out what they meant.
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