1774-1881
A Descriptive Catalogue of the Government Publications of the United States, September 5, 1774-March 4, 1881, compiled by Ben Perley Poore.
Locations: Government Documents - Reference - xx Z1223 .A1885 1962 and Main Library Reference xx Z1223 .A1885 1962
1789-1909
Checklist of United States
Public Documents 1789-1909, Congressional: to close of Sixtieth
Congress; departmental: to end of calendar year 1909, compiled by Mary A. Hartwell.
Location: Main Library Reference - Encyclopedias - J83 .C16 1990
1789-1970
Checklist of United States Public Documents, 1789-1970: Indexes, compiled by Daniel W. Lester and Marilyn A. Lester.
Five volume work
Locations: Government Documents Z1223.Z7 L45 - x and Main Library Reference Z1223.Z7 L45 - x
1789-1976
Cumulative Title Index to U.S. Government Publication, 1789-1976, compiled by Daniel Lester, Sandra Faull, Lorraine Lester
Location: Government Documents - Reference - Z1223 .Z7 C8 - No Loan
1881-1893
Comprehensive Index to the Publications of the United States Government, 1881-1893, by John G. Ames.
Location: Government Documents - Reference - Z1223 .A125 - x
1893-1940
Document Catalog, 1893-1940
Location: Government Documents - Reference - Z1223 .A13 - x
1900-1971
Cumulative Subject Index to the Monthly Catalog of U.S. Government Publications, 1900-1971
Fifteen volumes provide subject access to the Monthly Catalog. Location: Main Library Reference - Encyclopedias - Z1223 .A18 Cum. subject index
The quickest and easiest way to access Census Records is to use Ancestry.com or HeritageQuest Online (available to NY State Employees via the NY State Library.)
Ancestry.com is available for free to guests at Port Jefferson Free Library. Contact your local public library to see if they have it. Many do. You can also do a 14-day free trial. (You will have to use your credit card to set up the trial and you must cancel it before 14 days or they will begin to charge you monthly.)
You can also search on the internet to see if a specific state or municipality has made census records available online.
Also, try: The USGenWeb Census Project - a national Census Project that has many years and counties online.