FamilySearch.com currently provides access to census enumeration district maps for 1900 – 1940. This can be very useful if you want to find the census record for a particular location.
While various website for genealogical research provide a search feature to help you census records for a particular person, there is no comparable way to search by location. If you want to find the record for a particular address, you need to narrow the search geographically to a set of records small enough work with. Sometimes this is easy. For example, the 1880 census record for Dennison, Ohio comprises 25 pages, making it feasible to read through the entire record to look for a particular address.
For larger places, such as Columbus, Ohio, this approach becomes considerably more labor intensive. In 1850, for example, Columbus was divided into five wards, and the census records for Ward 1 alone comprises 92 pages. By 1860, the census records for Ward 1 had grown to 127 pages. For 1880 and on, census records for Ohio are organized into sets by enumeration district. This makes it a bit easier to search for a particular address, provided you know the enumeration district for that address. That is difficult to determine for 1880 (and Ohio census records for 1890 were destroyed by fire), but for 1900 and beyond, the enumeration district maps are a great help. Even so, the process can be difficult. The maps cited above are broken into sections that often are not labeled, so it takes a while to find the relevant map for a specific area in a given census year.