US common law is not codified in a single collection. It is found in all the state reporters as well as all the reporters that cover federal cases. Those change every day. New common law is generated somewhere every day. Your question is unanswerable. Go to a law library at your local court house or law school and ask to see where the state-by-state collections of common law are shelved and you will understand.
There are, however, two encyclopedias of the law, Corpus Juris Secundum and American Jurisprudence 2nd, which are regarded as being authoritative statements of the American common law. They are absolutely the first place to start research of the common law - which, incidentally, can vary from State to State. As far as how many pages goes, Corpus Juris is around 138 volumesor so, and Am Jur is about the same, not counting tables and index volumes.
The US is NOT a common-law jurisdiction. Many of the laws in effect in the US have their origin in so-called Common Law, mostly originating in England, but all the laws now in effect in the United States are statutory, not common.
US common law formed from English common law
US common law formed from English common law
The Earth After Us has 251 pages.
No, the basis of US law is the English common law.
The US did adopt the English Common Law, the only state that does not have the English Common Law is Louisiana.
US common law formed from English common law.
European standard is 32 pages I think, and US is 24 pages but you can add pages to a US passport.
What They Always Tell Us has 293 pages.
Rich Like Us has 301 pages.
Have Mercy on Us All has 346 pages.
Lord Dismiss Us has 378 pages.