Searching State Census Records.
State censuses were take in between the US Censuses. Usually, they were taken five years between meaning 1855, 1865, etc.
From the state census you can find children who may have been born and died between the US census years.
You can find people that are still alive, but died before the next census.
You can find location of families.
Most state censuses do not give as much information as the federal census, but occasionally they give more.