A geographic database listing information for cities in the United
States and some international locations is maintained by Merit, Inc.
The database is searchable by city name, zip code, etc. It will
respond with a lot of information: the area code,
elevation, time zone, and longitude and latitude are included. For
example, a query of 19013 yields
0 Chester
1 42045 Delaware
2 PA Pennsylvania
3 US United States
F 45 Populated place
L 39 50 58 N 75 21 22 W
P 45794
E 22
Z 19013
Z 19014
Z 19015
Z 19016
..
To use the server, telnet to martini.eecs.umich.edu on port
3000. The command help will yield further instructions, along
with an explanation for each of the fields in a reponse.