To tag a single webpage with the location 40°41.546'N 73°57.955'W include the following HTML in the head portion of the page.

<meta name="ICBM" content="40.69244, -73.96592" />
<meta name="geo.position" content="40.69244;-73.96592" />
<meta name="geo.placename" content="Clinton Hill - NY" />
<meta name="geo.region" content="US-NY" />
<meta name="DC.Coverage.spatial" scheme="DCMIPOINT" content="name=Clinton Hill, NY, USA.; east=286.034081; north=40.692436" />
Once you have tagged your site, you can ping a number of location trackers at once by entering your URL into this form:

If you have control over your DNS entries, and there is a location that applies to your entire domain, you might want to add a RFC-1876 location entry to your DNS.
If you are running Bind, you can accomplish this by adding the following to your DNS zone file (replacing example.com with the domain name the location applies to.

example.com.	LOC	40 41 32.770 N 73 57 57.308 W 8m

Once you've added the location information to your DNS, you can add your site to a location tracker I run by entering your domain name into this form: