By coincidence, are any of these birth dates from the 1930 census? There are intermittent omissions of the places being transcribed in other censuses, but, most, if not all, 1930 US census records do not include the birth place when merged.
To find them is rather easy. Double click on the citation entry for the birth fact for 1930. Then click on link to "See Source On-line".
Observe the birth place and insert it manually into FTM.
To find them is rather easy. Double click on the citation entry for the birth fact for 1930. Then click on link to "See Source On-line".
Observe the birth place and insert it manually into FTM.