graphic information of midwest counties from 2000 US census
</p>


<h3>Usage</h3>

<pre><code class='language-R'>midwest
</code></pre>


<h3>Format</h3>

<p>A data frame with 437 rows and 28 variables:
</p>

<dl>
<dt>PID</dt><dd><p>Unique county identifier.</p>
</dd>
<dt>county</dt><dd><p>County name.</p>
</dd>
<dt>state</dt><dd><p>State to which county belongs to.</p>
</dd>
<dt>area</dt><dd><p>Area of county (units unknown).</p>
</dd>
<dt>poptotal</dt><dd><p>Total population.</p>
</dd>
<dt>popdensity</dt><