They are listed in Pittsburg at least in the 1860 and 1870 census.
More details are available.
We would be very interested in any info you have on the Merrill surname descendants of Daniel down to the present day. We are trying to database the Merrill surname nationwide from the original immigrants right down to the present day for all the immigrant lines. So far we have over 40,000 merrill males, plus their wives and daughters in our database, but we estimate that there are well over 100,000, so we have a long way to go, and we need and appreciate all the help we can get, particularly with the later generations. We use this database strictly to try and help folks trace their Merrill roots. Be assured that info on living individuals will not become internet accessible.