For 1910, there is a National Archives set of microfiche, M1283 (50 fiche),
which cross-references street addresses with EDs for a number of large
cities in the US, including the boroughs of NY City. This is by far the
easiest way to locate a 1910 ED if you know the address.
Additionally for 1910 there is microfilm T1224 "Census Enumeration District
Descriptions (1910)" which you can use to identify the E.D. Manhattan and
Bronx are on Roll 35 of this series.
Enumeration district descriptions for 1920 are also in the same microfilm
series, T1224. Roll 51 has Manhattan and Bronx.
The above are available from the LDS but I don't know their catalog
numbers.
There are census maps on LDS microfilm #1414873 "New York Census Maps
1900-1940". Manhattan is include for 1920 but unfortunately _not_ for
1910. Note that these maps are often more difficult to use than the
census description films because the colored ink used to delineate the
EDs on the original maps is not very distinct on the B&W microfilm.
For 1920 of course you could always go to the Soundex, which would locate
the family if they changed addresses in the intervening years.
Regards,
Charles Sullivan
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