i went down this slope with Robert Cook at Metaweb, who wanted the
same
data.
The bad news is this is not nearly as clearcut as most things just
because
USPS really is not (necessarily) the government. They are like
Amtrak.
Wikipedia says otherwise: "The USPS is often mistaken for a
government-owned corporation (e.g., Amtrak), but as noted above is
legally defined as an "independent establishment of the executive
branch of the Government of the United States," (39 U.S.C. § 201) as
it is wholly owned by the government and controlled by the
Presidential appointees and the Postmaster General. As a
quasi-governmental agency, it has many special privileges, including
sovereign immunity, eminent domain powers, powers to negotiate postal
treaties with foreign nations, and an exclusive legal right to deliver
first-class and third-class mail. Indeed, in 2004, the U.S. Supreme
Court ruled that the USPS was not a government-owned corporation and
therefore could not be sued under the Sherman Antitrust Act.[2]"
(http://en.wikipedia.org/wiki/USPS#Governance_and_organization)
So it sounds like we've got the Supreme Court on our side. Also, even
if they weren't a government agency, this is strictly factual data and
thus can't be copyrighted under _Feist_.
I'll put it up if you don't want to, but I don't see any legal issues.
A service of Public.Resource.Org.