The 1890 US census was almost destroyed by fire. Here's what happened and what 1890 census substitute records are available.
A Research Guide to the 1890 United States Census
Genealogy Q&A: Researching Census Records
What Happened to the 1890 Census? – Katie Using Words
1-Hollerith Punched Card example from the 1890 US census
What Happened to the 1890 US Census Records?
1890 Veterans Census - History - U.S. Census Bureau
AF-429: State Censuses: Substitutes for the 1890 US Federal Census
Genealogy Q&A: Researching Census Records
Can You Get DNA From Hair? - Who are You Made Of?
The 1890 United States Census of Religious Bodies : r/MapPorn
Everything you need to know about US census records