Flannerys in Cincinnati

A courthouse fire in 1884 destroyed most records stored there.

Naturalization records were mostly destroyed in the fire; some re-filings can be found.

Birth and death data from Hamilton County aren't very useful until about 1913 or so.

Marriages, while destoyed in the fire, have either been recreated by the parties involved after the fire, or extensively researched by others from church records.

Cemetery and church records, combined with the city directories are the primary sources for finding people.

The most useful thing you can know about your Flannerys in Cincinnati is where they lived.  An exact street name and a year is great to have, which helps you to keep identically-named people separated as well as indicate the church they likely attended.

It will be necessary to write the Archdiocese of Cincinnati to get church records, and you must be precise in your request.

If you are descended from a Flannery, consider joining the Flannery Clan in Dublin. It is collecting genealogy and history of the Flannerys

Using the information I've supplied, start with the St Joseph's Cemetery data to see if parents and/or an address are listed.  Then go to the city directories to see if you can trace the family in them.  If you can identify where your family lived during important life events (births, marriages, deaths), then you can identify the most likely church they attended.