zipcoder | Ruby Gem to handle zip code lookup | Compression library

I am trying to merge two different dataframes on R. One dataframe is of about 5000 observations (dataframeA), while the other one is of 500 (dataframeB). The data is about ZIP codes. Using the package zipcodeR I created dataframeB from dataframeA. In fact, among all of the 5000 observations of dataframeA there were only 500 different ZIP codes. Now I want to extract the city from dataframeB and add it to every row of dataframeA with the corresponding ZIP code. How can I do it?

Here's a little example of what I'm doing:

I am using the tint template in R Markdown for an HTML rendering. I don't think that this issue is specific to R or R Markdown, though. I think the fix can be accomplished with CSS or HTML. Although, I would guess that Dirk, Jon, or JJ, Yihui, or Dave could probably tell me how to fix this properly in R Markdown since they authored or contributed to the development of tint.

How can I modify this to prevent the margin notes from affecting the spacing below the table?

I did try setting the table tag with the styles align: left; and float: left; to see if that would work. Neither impacted the spacing at the bottom.

Here is the table footer with the margin note as HTML script:

I have two separate data tables that I want to find the closet zip code from one data table to the other. From the SiteZip table, I want the zip codes to loop through the ConsumerZip table to obtain the shortest distance between zip codes. I used the zipcodeR package to assign lat and long to it. The two tables are below. The first table are the locations of stores. The other table are customer locations. I want to be able to create a single table that shows the closest store for each customer. I have researched for a couple days and haven't found many requests that match what I'm looking for. Ultimately I would map the store locations with a density circle by customer location. Thank you in advance for any help you can provide.