A. Overview

This project consists of various census tools.  There's a lot of overlap, and it's a bit confusing to know which tool to use when.  So let me try to briefly summarize each one and explain the differences between them.
 

1a. Obtaining EDs for the 1910 to 1940 Census -- Large Cities (1910-1940 Enumeration Districts Form)

Starting in 1880, all information in the census is arranged by ED and stored on microfilm rolls.  In order to know which microfilm roll to look in, you need to know the ED in which the person lived.

This One-Step tool allows you to determine the 1910, 1930, or 1940 ED number if you know the person's address.  It is a street-based search utility for large cities.  For 1910 it covers the top 100 cities in population plus a few others.  For 1930 all cities having a population over 25,000 (over 400 cities) are included, and for 1940 it includes all cities over 50,000 plus at least one city per state (about 220 cities).  Once you find your ED, links are provided to convert it to the corresponding ED for the other census years (see 3).

For 1910, this tool goes beyond large cities.  It includes tables of political divisions as well.  So not only are the top large cities there, but so are the names and ED numbers of townships, villages, towns, precincts, and small cities.

This ED Definition tool is useful for obtaining ED definitions from the ED number and vice versa for ALL 1930 EDs.  For large cities (population greater than 25,000 in 1930), this is not as powerful as the every-street based utility (1a above), but the ED Definition tool will be the main way of finding ED numbers for smaller communities in 1930.  Once you have a 1930 ED number from this utility, links are provided to convert it to a 1920 or 1940 ED number (see 3).

Once you've found the 1910 or 1930 ED number by using the previous tools, you'll want to view the images of the pages in that ED.  To do that you'll need to know the number of the microfilm roll that contains that ED and also how the EDs are arranged on that roll.

This One-Step tool allows you to determine the microfilm roll number and to see a layout of that roll.  Furthermore, if you have an ancestry.com subscription, this tool will let you view the images of the pages on that roll or in that ED.

Obtaining EDs

Using this utility, you can specify a state and be presented with a list of cities, towns, and villages that have three or more EDs.  You can select the one you are interested in, and see a list of the 1920, 1930, or 1940 EDs for that area.  This is quick, but it is not as high a resolution as 1b above, which should be your first approach.

Converting EDs

Once you've found the ED number of a census, and perhaps the corresponding census record as well, you'll probably want to try finding the family in other census years.  This tool allows you to convert the ED number you've already found to the ED number that you'll need for the other year.  Of course this assumes the family you want hasn't moved during the intervening time period.

But more important, you can use this utility to obtain the 1920 ED from an address by first finding the 1930 ED, regardless of whether the family lived at that address in 1930 or not.  To do so you would use the utility in 1a or 1b to obtain the 1930 ED number of that address, and then use this utility to convert that to a 1920 ED number.  This is currently the only way to obtain 1920 EDs.

For 1940, the utility in 1a can be used to obtain the ED directly.  However that utility covers only those cities with population greater than 50,000.  By contast, for 1930 the utility in 1a covers all cities greater than 25,000.  So for those cities between 25,000 and 50,000, the approach would be to use the utility in 1a to obtain the 1930 ED, and then use this utility to convert it to the 1940 ED.  And for those cities below 25,000, you would use the utility in 1b to obtain the 1930 ED, and then convert it to the 1940 ED using this utility.

If you have an ancestry.com subscription, you will be able to search all the census years for a person by name (without knowing the address) and then view the image of that person's census page.  There are various forms on the ancestry website that allows you to do this search.

The tool presented here provides ancestry.com subscribers with an even more powerful search form than the one contained on the ancestry.com website.  You can search in ways that were not possible otherwise.

For 1910 searches, you might need to use the tool described in 6 to get to the census image after you've found the person by name.

If you have a genealogy.com subscription, you will be able to search various census years for a person by name (without knowing the address) and then view the image of that person's census page.  There are various forms on the genealogy website that allows you to do this search.

The tool presented here provides genealogy.com subscribers with the ability to search any year or state on the same form.  The genealogy.com website requires you to navigate to different pages for each state or year that you wish to search.

B. Search Strategies: Using a Combination of One-Step Tools

The simplest way to find a person is to do a name search using my Ancestry.com (or Genealogy.com) Search Form.  If you are lucky enough to find the person and to view the corresponding image of the census page, you are done and have no need for my other forms.

However there are several things that might prevent you from being successful.  My other forms help with some of these problems, at least for the 1910, 1920, and 1930 census years.

One problem is that the name might be so illegible that it was not read correctly, and you will never find the person, no matter how creative you are in your use of the name search on my Ancestry.com (or Genealogy.com) Form.  In that case you will need to know the person's address, and then use my Enumeration District Form in conjunction with my Microfilm Roll Form to find the image of the census page.  These two forms are actually designed to work together -- when you find the ED number using my Enumeration District form, you can click on a button and will get to my Microfilm Rolls Form with the state and ED number prefilled for you.

Another problem is that the entire census page might have been skipped over when the names were transcribed.  An example of that (which ancestry.com eventually fixed) was the 1930 census, New York State, Kings County, ED 24-502.  Although the microfilm images for this ED were on the ancestry.com site and could be viewed with my Microfilm Rolls Form, no person in this ED could be found using my Ancestry.com Search Form.  So again you would have to use the other two forms.

You might be successful in finding the person using my Ancestry.com Search Form, but then you discover that there is no link to the image of the census page.  For some reason, that link was not displayed on the results page that ancestry.com provided.  But the results page does give the ED number in which the person lived, and even gives the page number within that ED.  With that information you can go to my Microfilm Roll Form and view the image of the census page.  So this is an example where my Ancestry.com Search Form was used in conjunction with my Microfilm Roll Form.

Next suppose that you already have a copy of the census page containing the person you want, but you can't find that person using my Ancestry.com Search Form.  It could be that the name was misspelled when it was transcribed into the database and you'd like to know how the transcriber thought it was spelled.  You can do that by looking at a text version of the census page.  To obtain such a text version, use my Ancestry.com Search Form but leave the name field blank.  Fill in the state, the ED number (including county), and the page.  Do the search and the result will be a text version listing everyone who is on that page.

Finally, suppose you were successful in finding the person you want in the 1930 census and now you want to find him in the 1920 census.  And you are not able to locate him with a name search for any of the reasons already mentioned.  You would like a 1920 Enumeration District Form, similar to my 1930 one.  Unfortunately we don't have that but we have the next best thing.  The 1920/1930 Enumeration District Converter lets you enter the 1930 ED and it gives you the corresponding 1920 one.  The 1930 Enumeration District Form is designed to work together with the 1920/1930 Enumeration District Converter -- when you find the ED number using the 1930 Enumeration District Form, you can click on a button and get to the 1920/1930 Enumeration Disctrict Converter with the 1930 ED value already prefilled for you.

These were just a few examples.  Once you get familiar with this, you'll come up with strategies of your own.  Good luck with your searches.
 

-- Steve Morse