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Mary Shaffer — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Baltimore-County, Maryland

Our Model Tree links this Mary Shaffer across the 1930 and 1940 US Censuses in Baltimore-County, Maryland (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 7-person household.

Age 15 b. ~1925 Female Daughter Born: Maryland Single

1940 Census Record Details

Census Year1940
LocationBaltimore-County, Maryland
SurnameShaffer
Given NameMary B.
Relationship to HeadDaughter
SexF
Color / RaceWhite
Age15
Marital StatusSingle
BirthplaceMaryland
1935 Residence (City)Falls Road
1935 Residence (County)Baltimore
Additional Details
Class of Worker0
Highest GradeHs 2
1935 ResidenceSame place
Birth StateMaryland
Birth CountryUnited States
Birthplace (normalized)maryland
Township / WardFalls Road
Est. Birth Year~1925

Household Members

Census records only state relationship to the household head. Pairwise kinship is derived (~90–95% accurate), not recorded. Step/blended families and boarders can break it.

7 people recorded at the same address in the 1940 census.

Name Relation to head Relative to Mary Age Birth yr
Mary Shaffer Spouse — 48 ~1892
Ellen Shaffer Daughter — 21 ~1919
H Shaffer Daughter — 11 ~1929
Lydia Shaffer Daughter — 21 ~1919
Lewis Shaffer Son — 20 ~1920
Mary Shaffer Daughter — 15 ~1925
Isaac Shaffer Head — 56 ~1884

Census Appearances

1930
Baltimore, Maryland
Daughter, age 6
Baltimore, Maryland · implied b. ~1924 — 8 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Shaffer
Given Name Mary B.
Relationship to Head Daughter
Sex F
Color / Race White
Age 6
Marital Status Single
Birthplace Maryland
Father's Birthplace Maryland
Mother's Birthplace Maryland
Occupation none
Can Read/Write No
Birth State Maryland
Birth Country United States
Birthplace (normalized) maryland
1940
Baltimore-County, Maryland
Daughter, age 15
Baltimore-County, Maryland · implied b. ~1925 — 7 household members
Surname Shaffer
Given Name Mary B.
Relationship to Head Daughter
Sex F
Color / Race White
Age 15
Marital Status Single
Birthplace Maryland
1935 Residence (City) Falls Road
1935 Residence (County) Baltimore
Class of Worker 0
Highest Grade Hs 2
1935 Residence Same place
Birth State Maryland
Birth Country United States
Birthplace (normalized) maryland

Model Tree

An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Linked across censuses
Our Model Tree links Mary Shaffer across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Shaffer
Daughter · 1940 · age 15 · b. ~1925 · Maryland
★ You are viewing this record
Sibling
Lydia Shaffer
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ellen Shaffer
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lewis Shaffer
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
H Shaffer
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+) Probable / derived (~0.65–0.89) Candidate (<0.65, unverified)

Original Census Page

1940 US Federal Census — Baltimore-County, Maryland Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-01504-00257)

Line Name Age Relation Occupation Birthplace
41 George R. Nash 37 Son Carpenter Maryland
42 C. Carroll Nash 43 Head Farmer Maryland
43 Irma M. Nash 40 Wife — Maryland
44 Arthur C. Nash 17 Son Farm Laborer Maryland
45 Charles L. Nash 9 Son — Maryland
46 Susie S. Nash 67 Mother — Maryland
47 S. Paul Liggard 48 Hired hand Farm Laborer Maryland
48 Walter R. Demoss 52 Head Farmer Maryland
49 Myrtle C. Demoss 49 Wife — Maryland
50 Walter J. Demoss 22 Son Farm Laborer Maryland
51 Jeannette Demoss 17 Daughter New Worker Maryland
52 Isaac H. Shaffer 56 Head Carpenter Maryland
53 Mary B. Shaffer 48 Wife — Maryland
54 Lydia Mae Shaffer 21 Daughter — Maryland
55 Ellen Rae Shaffer 21 Daughter — Maryland
56 Lewis H. Shaffer 20 Son Carpenter Apprentice Maryland
57 Mary B. Shaffer THIS PERSON 15 Daughter — Maryland
58 H. Louisa D. Shaffer 11 Daughter — Maryland
59 Preston Shaffer 28 Head Carpenter Maryland
60 Mary Ruth Shaffer 22 Wife — Maryland
61 Dorothy R. Shaffer 1 Daughter — Maryland
62 Russell S. Martin 34 Head Carpenter Maryland
63 Hollie M. Martin 29 Wife — Maryland
64 Irvin Martin 11 Son — Maryland
65 Helen B. Martin 7 Daughter — Maryland
66 Daisy C. Palmer 64 Head — Maryland
67 Joshua Cofill 80 Head Farmer Maryland
68 Clara E. Cofill 68 Wife — Maryland
69 William S. Carr 39 Head Proprietor Maryland
70 Florence M. Carr 37 Wife — Maryland
71 W. Walter Carr 16 Son — Maryland
72 Robert L. Carr 14 Son — Maryland
73 Violet L. Carr 13 Daughter — Maryland
74 George L. Carr 12 Son — Maryland
75 William C. Miller 69 Head Farmer Maryland
76 Rosa Belle Miller 66 Wife — Maryland
77 Rachael R. Miller 30 Daughter — Maryland
78 William H. Ruby 66 Head Laborer Maryland
79 Cora E. Ruby 66 Wife — Maryland
80 Clarence Martin 57 Head Farmer Maryland

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About This Record & Model Tree

This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.

Source: National Archives and Records Administration (NARA)

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