What's the difference between the Postal Service-based congressional
zip to district table and the Capitol
in the way the tables are put together. The Postal Service table
is based entirely on congressional district assignments to zip codes
that are done by USPS state and regional offices. The Capitol version
is put together using a combination of Census data and geocoding
(where longitude and latitudes are assigned to each zip and accompanying
zip plus4), a long and tedious process.
shouldn't I just go to the Postal Service and do my own table?
It would cost you you nearly three times what we charge for the
table and then you would have to do a considerable amount of programming
to pull the table out of the raw Postal Service data. And then you'd
be dealing with 8 gigs of data and more programming to get it down
to a manageable size (when our programming is done our table in
the Access format is about 35 megs, the text table is about 15 megs).
How accurate is the Postal Service version of the congressional
zip to district table.
It's pretty accurate. It runs with about a 2 to 3 percent margin
of error, where you might know that you live in congressional district
2, the Postal Service data might show you in district 3.
the Postal Service ever correct these errors?
We started testing the Postal congressional zip-to-district table in
January 2005 and it was amazing how good the Postal Service had
gotten with their data. The Postal Service had really improved over
their past performance, they're doing an impressive job. If you
get the Postal Service table and find something you know is incorrect
send it to us and we'll pass it on to the Postal Service.
often are the Postal Service-based and Capitol version zip to district
tables updated ?
format or formats do they come in?
2000, a text file, or dBase IV.
what do we do if we want to go ahead and subscribe to your Postal
Service zip to district database ?
an e-mail stating that fact to
Michael Waters (be sure to include your name, organization's
name, mailing address, and other contact information). A license
agreement and an invoice will be sent to via return e-mail. Sign
and fax the license agreement back to Congress Merge (you'll be
given the fax number when you're sent the license agreement) and we go from
there. It's possible to get your data the same day.
this license agreement?
to our Postal zip-to-district data (and our other data products as
well) agree to use it for themselves
in an internal database or on a web site and not to distribute it
to third parties. Here is some of the wording from the license agreement:
Client) agrees to use the data only for itself (either in an internal
database or for a web site) and that additional uses can be granted
only after the signature of another license agreement and the
payment to Congress Merge of the appropriate fees for the data
at the time of further agreements. . . .
Client) will not otherwise distribute the "Data" to any other
individual or organization.
this licensing agreement mean I can only install the database on
Install it on as many machines as you like as long as you don't
give it to a third party, you're fine. In fact, you can install
it on a network if you'd like -- all at no extra charge.
Does it come with a listing of members of Congress and their contact
We give each subscriber a list of all members of Congress and their
Washington, DC, contact information This information is provided
in a text file that is updated weekly while Congress is in session.
If you want committee/subcommittee assignments, district office
information, and key staffers please see the question below.
we also subscribe to your congressional database.
If you get the either the Postal Service-based or the Capitol versions
of our congressional zip-to- district tables and and also purchase
the congressional information database we'll deduct $100 off the
total price. Our
congressional information database is updated frequently, sometimes
daily, to reflect changes on the Hill, be they e-mail changes, district
office changes, or committee and subcommittee assignments. Please
use this link for more information on our congressional information
the same licensing agreement apply to the congressional information
essence, yes. The only difference is that the congressional information
database is cited in the agreement. And, as with the Postal Service-based
zip-to-district table, you can load the congressional information
database on a network or on as many individual machines as you'd
like...as long as you don't give it to a third party -- all at no
I expect my annual fee to go up in the years ahead?
As long as you are a Congress Merge subscriber your price will stay
to data information page