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John Simms — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Baltimore-City-County, Maryland

Our Model Tree links this John Simms across the 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 8-person household.

Age 15 b. ~1925 Male Son Born: Maryland Single

1940 Census Record Details

Census Year1940
LocationBaltimore-City-County, Maryland
SurnameSimms
Given NameJohn
Relationship to HeadSon
SexM
Color / RaceBlack
Age15
Marital StatusSingle
BirthplaceMaryland
1935 Residence (City)Baltimore City
1935 Residence (County)Baltimore City
Additional Details
Class of Worker0
Highest GradeNo 6
1935 ResidenceSame place
Birth StateMaryland
Birth CountryUnited States
Birthplace (normalized)maryland
Township / WardBaltimore City
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.

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

Name Relation to head Relative to John Age Birth yr
James Simms Son — 14 ~1926
John Simms Son — 15 ~1925
Alice Simms Daughter — 12 ~1928
Joseph Simms Son — 4 ~1936
Mary Simms Daughter — 10 ~1930
Nettie Simms Head — 33 ~1907
Grace Simms Daughter — 9 ~1931
Robert Simms Son — 6 ~1934

Census Appearances

1930
Baltimore, Maryland
Son, age 6
Baltimore, Maryland · implied b. ~1924 — 9 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Simms
Given Name John
Relationship to Head son
Sex M
Color / Race Black
Age 6
Marital Status Single
Birthplace Maryland
Father's Birthplace Maryland
Mother's Birthplace Maryland
Occupation none
Birth State Maryland
Birth Country United States
Birthplace (normalized) maryland
1940
Baltimore-City-County, Maryland
Son, age 15
Baltimore-City-County, Maryland · implied b. ~1925 — 8 household members
Surname Simms
Given Name John
Relationship to Head Son
Sex M
Color / Race Black
Age 15
Marital Status Single
Birthplace Maryland
1935 Residence (City) Baltimore City
1935 Residence (County) Baltimore City
Class of Worker 0
Highest Grade No 6
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 John Simms across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Simms
Son · 1940 · age 15 · b. ~1925 · Maryland
★ You are viewing this record
Sibling
Mary Simms
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Simms
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Simms
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Grace Simms
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Simms
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Simms
Sibling · 1940 · age 12
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-City-County, Maryland Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-01531-00352)

Line Name Age Relation Occupation Birthplace
41 Thomas A. Murphy 53 Head Car Distributor Maryland
42 Ella B. Murphy 50 Wife — Maryland
43 Rosemary Murphy 25 Daughter — Maryland
44 C. Carl Murphy 24 Son Clerk Maryland
45 J. Brady Murphy 22 Son Clerk Maryland
46 Elizabeth Voigt 50 Head — Maryland
47 Bertha Keyser 52 Lodger Seamstress Maryland
48 Elizabeth Malkmus 38 Lodger — Maryland
49 Walter H. Harvard 60 Head — Maryland
50 Blanch M. Harvard 55 Wife — Maryland
51 William H. Duncan 58 Head — Maryland
52 Kate R. Duncan 58 Wife — Maryland
53 Lida Duncan 30 Daughter Teacher Maryland
54 Mary Duncan 25 Daughter Secretary Maryland
55 J. William Duncan 21 Son Lab. Technician Maryland
56 Margaret Blattau 62 Head — Maryland
57 Frederick Wagner 46 Head Plumber Maryland
58 Clara Wagner 45 Wife — Maryland
59 Carl Wagner 21 Son New Worker Maryland
60 Gordon Wagner 19 Son Assembler Maryland
61 Selma Wagner 17 Daughter — Maryland
62 Hetty Wagner 6 Daughter — Maryland
63 Clara Duffy 60 Head Nurse West Virginia
64 Margaret Duffy 72 Sister — West Virginia
65 Charles Duffy 50 Brother Repairman West Virginia
66 Mary Garvy 74 Sister — West Virginia
67 Louise Jones 60 Head — Maryland
68 Robert Harris 10 Adopted son — Maryland
69 Frank J. Tuckson 39 Head — Virginia
70 Rose S. Tuckson 29 Wife — Maryland
71 Robert H. Tuckson 5 Son Cook Maryland
72 Nettie Simms 33 Head — Maryland
73 John Simms THIS PERSON 15 Son — Maryland
74 James Simms 14 Son — Maryland
75 Alice Simms 12 Daughter — Maryland
76 Mary Simms 10 Daughter — Maryland
77 Grace Simms 9 Daughter — Maryland
78 Robert Simms 6 Son — Maryland
79 Joseph Simms 4 Son — Maryland
80 Willie Coleman 30 Head Laborer N. Carolina

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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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