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John Conrad — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Cook-County, Illinois

Our Model Tree links this John Conrad across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1924), then head of a 7-person household.

Age 16 b. ~1924 Male Son Born: Illinois Single

1940 Census Record Details

Census Year1940
LocationCook-County, Illinois
SurnameConrad
Given NameJohn H.
Relationship to Headson
SexM
Color / RaceWhite
Age16
Marital StatusSingle
BirthplaceIllinois
1935 Residence (City)Chicago city
1935 Residence (County)Cook
Additional Details
OccupationChecker
IndustryN.Y.A.
Class of WorkerGW
Hours Worked14
Income (1939)291
Highest GradeHs 2
1935 ResidenceSame place
Birth StateIllinois
Birth CountryUnited States
Birthplace (normalized)illinois
OccupationChecker
Township / WardChicago City
Est. Birth Year~1924

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 John Age Birth yr
John Conrad Son — 16 ~1924
Mamie Conrad Spouse — 48 ~1892
Peggy Conrad Daughter — 18 ~1922
Walter Conrad Son — 23 ~1917
Walter Conrad Head — 48 ~1892
Thomas Conrad Son — 14 ~1926
Betty Conrad Daughter — 20 ~1920

Census Appearances

1930
Cook, Illinois
Son, age 6
Cook, Illinois · implied b. ~1924 — 3 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Conrad
Given Name John
Relationship to Head Son
Sex M
Color / Race White
Age 6
Marital Status Single
Birthplace Illinois
Father's Birthplace Czechoslovakia
Mother's Birthplace Pennsylvania
Birth State Illinois
Birth Country United States
Birthplace (normalized) illinois
1940
Cook-County, Illinois
Son, age 16
Cook-County, Illinois · implied b. ~1924 — 7 household members
Surname Conrad
Given Name John H.
Relationship to Head son
Sex M
Color / Race White
Age 16
Marital Status Single
Birthplace Illinois
1935 Residence (City) Chicago city
1935 Residence (County) Cook
Occupation Checker
Industry N.Y.A.
Class of Worker GW
Hours Worked 14
Income (1939) 291
Highest Grade Hs 2
1935 Residence Same place
Birth State Illinois
Birth Country United States
Birthplace (normalized) illinois

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 Conrad across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Conrad
Son · 1940 · age 16 · b. ~1924 · Illinois
★ You are viewing this record
Sibling
Walter Conrad
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Conrad
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Peggy Conrad
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Conrad
Sibling · 1940 · age 14
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 — Cook-County, Illinois Open full size

Page Contents

39 people indexed on this census page (nara:1940:m-t0627-01002-00343)

Line Name Age Relation Occupation Birthplace
41 Bertha Holty 69 wife — Illinois
42 Alfred Holty 48 son — Illinois
43 John Miller 45 Head Floor Man Austria
44 Minnie Miller 45 wife — Austria
45 Robert Miller 16 son — Illinois
46 Ronald Miller 5 son — Illinois
47 Philip Wagner 74 Father-in-law — Austria
48 Elizabeth Wagner 67 Mother-in-law — Austria
49 William Massey 35 Head Supervisor N. Dakota
50 Ruth Massey 31 wife — Illinois
51 Marilyn Massey 7 daughter — Illinois
52 Catherine Baker 58 Mother-in-law — Indiana
53 Walter N. Conrad 48 Head Patrol Man Illinois
54 Mamie Conrad 48 wife — Illinois
55 Walter Jr. Conrad 23 son Elevator Operator Illinois
56 Betty Mae Conrad 20 daughter Cashier Illinois
57 Peggy June Conrad 18 daughter Beautician Illinois
58 John H. Conrad THIS PERSON 16 son Checker Illinois
59 Thomas C. Conrad 14 son — Illinois
61 Oscar Sevon 40 Head Bus Chauffer Illinois
62 Audrey Sevon 42 wife — Wisconsin
63 Richard Sevon 8 son — Illinois
64 Gail Sevon 5 daughter — Illinois
65 Zach Kalogeras 39 Head Electrician Greece
66 Marie Kalogeras 36 wife — Wisconsin
67 Leila Kalogeras 9 daughter — Illinois
68 Joseph Mcbride 61 Head — Illinois
69 Laura Mcbride 68 wife — Massachusetts
70 Frank Vojta 45 Head Plant Supt Illinois
71 Anna Vojta 41 wife — Illinois
72 Kathryn Vojta 18 daughter Stenographer Illinois
73 Alfred Otte 55 Head Printer Illinois
74 Beatrice Otte 42 wife — Illinois
75 William Sutton 52 Head Export Clerk Illinois
76 Bernice Sutton 28 wife — Illinois
77 Robert Sutton 3 son — Illinois
78 Helen Dzenne 50 Head Supervising Clerk Illinois
79 Charlotte Dzenne 16 daughter — Illinois
80 William Dzenne 14 son Delivery Illinois

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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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