Name of info page in published book

I'm not in publishing, but I've always heard that called the copyright page, because the copyright statement is always on it. It usually has other 'pertinent info' such as publication year and the printing number (as encoded in the 'number line'), Library of Congress number, and the ISBN. If it's a book club edition, the book title and copyright statement with author's name, and maybe the publisher's name might be the only things on it.

When I worked in the library (I'm not a professional librarian, but I did some book cataloging for a private school library) we called that the copyright page. And what you're referring to as "Library of Congress information" is "CIP data". (CIP=Cataloging in Publication)

In modern books it's generally called the "copyright page."

Among antiquarian booksellers, it's called "page facing title" or "page opposite title."

The ISBD (a reference work for cataloguers) seems to refer to it sometimes as a 'colophon', but I thought that was specifically an endnote on the typeface and printing.

Albedo said:

The ISBD (a reference work for cataloguers) seems to refer to it sometimes as a 'colophon', but I thought that was specifically an endnote on the typeface and printing.

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A colophon can be on the page opposite title. But usually not.