One option is to do this:

%$anonhash = (%$anonhash,
    name => "dave",
    city => "San Francisco",
    ...
);
[download]

Of course, this way you can not read the values from the hash, only write them, and the changes are written to the hash at once, not with each key.

Another similar option is

@$anonhash{qw"name city ..."} = ("dave", "San Francisco", ...);
[download]