The shear numbers of records found at the FamilySearch labs website are mind boggling. Within the digitized records now found posted 
at the site are quite a number of State Census records.
Records for Florida, Massachusetts, Minnesota, New York, Rhode Island, South Dakota, and Wisconsin are now found there.
These records are not all indexed, but even those can be browsed by location. A few of the databases are not imaged, but they are searchable.
The state census may include many images that are not population schedules including mortality and agricultural schedules. In some cases the images are in separate databases; in others they may be found at the end of the population schedules.
The following State Censuses are now found at the FamilySearch Labs site:
- Florida State Census, 1885 (Browse Images Only)
- Florida State Census, 1935 (Browse Images Only
- Florida State Census, 1945 (Browse Images Only)
- Massachusetts State Census, 1855
- Massachusetts State Census, 1865
- Minnesota State Census, 1895 (No Images)
- New York State Census, 1865 (Browse Images Only)
- New York State Census, 1892
- New York State Census, 1905 (Browse Images Only)
- Rhode Island State Census, 1915 (No Images)
- South Dakota State Census, 1905
- South Dakota State Census, 1915
- South Dakota State Census, 1925
- Wisconsin State Census, 1855
- Wisconsin State Census, 1875
- Wisconsin State Census, 1885
- Wisconsin State Census, 1895
- Wisconsin State Census, 1905
Thirty-seven states have Colonial, Territorial, and State Censuses.
Use these census records to fill in your family data for the years between the Federal decennial censuses.
I recommend the following four books for those who would like to add to their family records:
Census Substitutes & State Census Records – Vol. 1 – Eastern States, by William Dollarhide
Census Substitutes & State Census Records – Vol. 2 – Western States, by William Dollarhide
New York State Censuses & Substitutes, by William Dollarhide
State Census Records, by Ann Lainhart
