Genealogy: 1900 Census birth year reference chart

census birth yearBy Barry J. Ewell
As you track your ancestor through the U.S. Federal Population Censuses, you can use age to help you

  • Identify individual members of the family
  • Provide clues to confirm I have the right person/family unit as you search each census
  • Provide clues as to relationship in the family
  • Provide clues if I have the right female when surnames change through marriage
  • Provide clues when people use nicknames and other name variations from one census to the next

I have prepared a birth year reference chart for each census to help you identify an estimated birth year for each ancestor.  This article will focus on the 1900 U.S. Federal Population Census.

Learn more about information about age found in the census:

1900 U.S. Census birth year reference chart
In Column 8 of the 1900 US Population Census, learn the age of each member of the household.  The following chart will provide the approximate corresponding birth year for the age provided.

Age calculated as of June 1, 1900.

AgeBirth YearAgeBirth YearAgeBirth Year
May 0/121900281872671833
Apr 1/121900291871681832
Mar 2/121900301870691831
Feb 3/121900311869701830
Jan 4/121900321868711829
Dec 5/121899331867721828
Nov 6/121899341866731827
Oct 7/121899351865741826
Sep 8/121899361864751825
Aug 9/121899371863761824
Jul 10/121899381862771823
Jun 11/121899391861781822
11899401860791821
21898411859801820
31897421858811819
41896431857821818
51895441856831817
61894451855841816
71893461854851815
81892471853861814
91891481852871813
101890491851881812
111889501850891811
121888511849901810
131887521848911809
141886531847921808
151885541846931807
161884551845941806
171883561844951805
181882571843961804
191881581842971803
201880591841981802
211879601840991801
2218786118391001800
2318776218381011799
2418766318371021798
2518756418361031797
2618746518351041796
2718736618341051795

Census taker instructions for age on 1900 Census
The following are the exact instructions given to census taker (enumerator):

131. Column 8. Age at last birthday.-The object of this question is to get the age of each persons in completed years, or in the case of a child under one year the age in completed months.

132. For each person of one year of age or over, enter the age at last birthday in whole years, omitting months and days. for children who, on the first day of June, 1900, were less than one year of age, enter the age in months, or twelfths of a year, thus: 3/12, 7/12, 8/12. For a child less than one month old, enter the age as follows: 0/12.

133. Endeavor to ascertain in each case the month and year of birth called for in column 7, but where this is impossible get as nearly as possible the exact years of age. An answer given in round numbers, such as “about 30,” “about 45,” is likely to be wrong. In such cases endeavor to get the exact age.