1. Start with the strongest record
Record the exact date and time as written, plus the city, county, facility name, and birthplace type if they are available. U.S. birth-certificate workflows distinguish the facility name, city or location of birth, county, and type of place where the birth occurred.
Sources: CDC/NCHS — Facility Worksheets Guide for the Certificate of Live Birth · CDC/NCHS — Facility name on the U.S. Standard Certificate of Live Birth · CDC/NCHS — Place where birth occurred
2. Find the facility as it existed on the birth date
Do not assume the hospital using that name today occupies the same building. Hospitals move, merge, rename, expand, and demolish wings. Search the facility name with your birth year, then verify the historic address against directories, newspapers, property records, hospital histories, or maps.
3. Narrow campus → building → maternity ward
Once the campus is secure, look for obstetrics, labor and delivery, maternity, nursery, or birth-center references. Sanborn maps can reveal building footprints and uses; USGS historical maps can help reconstruct a campus or street network that has since changed.
Sources: Library of Congress — Sanborn Fire Insurance Maps · Library of Congress — Searching for Sanborn Maps · U.S. Geological Survey — topoView
4. Stop where the evidence stops
A supported building centroid is better than a guessed ward. Record an evidence level such as city, facility, building, wing, or exact room, plus the sources that justify it. Decimal places are not a substitute for evidence.
5. If you were not born in a hospital
Follow the same principle. A home birth may resolve to a historical street address; a freestanding birth center may have moved; a birth in transit may require a different record trail. The source tells you what kind of location you can defend.