Per the The microformats process, this page documents examples of sites publishing their coverage-area.
Many businesses publish on their website their coverage area which do for example delivery (food) or Real Estate business and covers only a part of a country, county, metro and so on. Examples:
Sotheby's International Realty
text: "Coverage Area:"
<dl class="group"> <dt>Coverage Area: </dt> <dd>Colorado, </dd> <dd>Avon, </dd> <dd> Beaver Creek, </dd> <dd> Carbondale, </dd> <dd> Cordillera, </dd> <dd> Dotsero, </dd> ... </dl>
text: "We Deliver Within a Five(5) Mile Radius of Pizza Pronto 7870 Idlewild Rd Indian Trail, NC 28079"
The delivery coverage area radius is shown on Google Maps.
<div align="center"> <div id="header_Text">We Deliver Within a Five(5) Mile Radius of Pizza Pronto 7870 Idlewild Rd Indian Trail, NC 28079 </div> <table width="899" border="1"> ...
Text: "We operate within an approximate 10 mile radius of Mortimer, which is about 8 miles south-west of Reading, Berkshire."
<h1>Area of Coverage</h1> <p>We operate within an approximate 10 mile radius of Mortimer, which is about 8 miles south-west of Reading, Berkshire. The area is bounded by Newbury in the west and Bracknell in the east, extending south of the M3 to include Basingstoke, Odiham and Fleet and northwards to include Goring and Henley-upon-Thames (<a href="map.asp" onclick="window.open('map.asp','map','width=520,height=450'); return false">view map</a>).</p>
WAMC Northeast Public Radio
text: "Coverage Map"
<a href="/coveragemap.html">Coverage Map</a> <br><br> <strong>Stations</strong><br><br> <font size="1">WAMC, 90.3 FM<br>Albany NY<br><br>WAMC, 1400 AM<br>Albany, NY<br><br> WAMK, 90.9 FM<br>Kingston NY<br><br>WOSR, 91.7 FM<br>Middletown NY<br><br> WCEL, 91.9 FM<br>Plattsburgh NY<br><br>WCAN, 93.3 FM<br>Canajoharie NY<br><br> ... <br>WANZ, 90.1 FM<br>Stamford</font>