Sentence:  Even though the registers may have an incomplete record of persons present in a particular area or <WSD>include</WSD> persons no longer living there , they contain precise information on ages , by date of birth , for some of the persons present ( especially children in relatively stable communities ) and supplementary information ( such as records of marital status ) for many others . 
Meaning of the word marked with <WSD> tags:  have as a part, be made up out of