title: Are county FIPS accurate in R maps()?
body: <p>When I run the following code...</p>
  
  <pre><code>require(maps)
  colors &lt;- data.frame(county=county.fips$polyname,color=rep("#FFFFFF",nrow(county.fips)), stringsAsFactors=FALSE)
  colors[colors$county=="arizona,maricopa","color"] &lt;- "#ABCABC"
  map("county", col = colors$color, fill = TRUE)
  </code></pre>
  
  <p>I get a highlighted value for a county that is not Maricopa...  It's Mohave county.</p>
  
  <p><a href="https://i.stack.imgur.com/wVgYu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wVgYu.png" alt="usa counties"></a></p>
  
  <p>Am I doing something wrong, or is the data suspect?</p>
  
  <p>I'm using maps_2.3-11</p>