You can also control the colors and properties of the individual ZIP Codes in your list by building your data in a spreadsheet program like Excel and then copying and pasting it large textarea (the lines may wrap... that's OK... what is important is that your columns are tab delimited.

Please see the <A href="youngstownsample.xls">Youngstown Sample</A> for an Excel formatting sample and please note the following tips:

<ul>
<li>If building from scratch in Excel, set your ZIP Code and HEX color columns as TEXT fields by highlighting the columns and then selecting: Format> Cells> Text, so that Excel does not reformat these for you
<li>Instead of typing colors in HEX format, you can use color names defined <A href="http://www.free-zipcode-maps.com/tools/showgooglemaps/colorhelp.htm">here</A>, just make sure that the color names are spelled correctly.
<li>The header row is not required, but the columns must be in the same order as
  defined below.
<li>The Layer Name column is not used by the mapping program.&nbsp; It's just a
  helper column to help keep the ZIP Codes and colors organized.
</ul>


<p><img border="0" src="samplexls.gif" width="657" height="300"></p>