1870 Baltimore, Chicago, and St. Louis Census Index Please enable JavaScript in your browser to complete this form.Please enable JavaScript in your browser to complete this form.Your Email *EmailConfirm EmailFull Name You Want Searched *Helpful InformationSubmit This index links over 352,000 census records from three major cities: Baltimore, MD; Chicago, IL; and St. Louis, MO. Explore your ancestry with a free trial!