John Frederick — 1940 US Census Record

Model Tree available

1940 United States Federal Census · Woodbury-County, Iowa

Our Model Tree links this John Frederick across the 1920, 1930 and 1940 US Censuses in Woodbury-County, Iowa (XGBoost, ~Confirmed), with identified parents Dominic & Rose — first a son (b.~1909), then head of a 3-person household.

Age 31 b. ~1909 Male Son Born: Iowa Divorced

1940 Census Record Details

Census Year	1940
Location	Woodbury-County, Iowa
Surname	Frederick
Given Name	John
Relationship to Head	Son
Sex	M
Color / Race	White
Age	31
Marital Status	Divorced
Birthplace	Iowa
1935 Residence (City)	Sioux City
1935 Residence (County)	Woodbury
Additional Details
Occupation	laborer
Industry	stock yards
Class of Worker	PW
Hours Worked	42
Income (1939)	1560
Highest Grade	Hs 4
1935 Residence	Same House
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa
Occupation	Laborer
Township / Ward	Sioux City
Est. Birth Year	~1909

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.

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

Name	Relation to head	Relative to John	Age	Birth yr
Uliana Frederick	Daughter	—	35	~1905
John Frederick	Son	—	31	~1909
Dominic Frederick	Head	—	76	~1864

Census Appearances

1920

Woodbury, Iowa

Son, age 11

Woodbury, Iowa · implied b. ~1909 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Frederick
Given Name	John
Relationship to Head	Son
Sex	M
Color / Race	White
Age	11
Marital Status	Single
Birthplace	Iowa
Father's Birthplace	Italy
Mother's Birthplace	Italy
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

1930

Woodbury, Iowa

Son, age 21

Woodbury, Iowa · implied b. ~1909 — 4 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Frederick
Given Name	John
Relationship to Head	Son
Sex	M
Color / Race	White
Age	21
Marital Status	Single
Birthplace	Iowa
Father's Birthplace	Italy
Mother's Birthplace	Italy
Occupation	Laborer
Industry	Stock Yards
Class of Worker	W
Can Read/Write	Yes
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

1940

Woodbury-County, Iowa

Son, age 31

Woodbury-County, Iowa · implied b. ~1909 — 3 household members

Surname	Frederick
Given Name	John
Relationship to Head	Son
Sex	M
Color / Race	White
Age	31
Marital Status	Divorced
Birthplace	Iowa
1935 Residence (City)	Sioux City
1935 Residence (County)	Woodbury
Occupation	laborer
Industry	stock yards
Class of Worker	PW
Hours Worked	42
Income (1939)	1560
Highest Grade	Hs 4
1935 Residence	Same House
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

Model Tree

Model Tree available

Our Model Tree links John Frederick across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Dominic Frederick (~0.92 confidence) and mother Rose Frederick (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.

Show:

Gen 1 Parents confidence ≈ 0.92

Father

Dominic Frederick

b. ~1864

Source father

● Household · direct · ~0.92

Mother

Rose Frederick

b. ~1871

Source mother

● Household · direct · ~0.92

This person

Anchor record

John Frederick

Son · 1940 · age 31 · b. ~1909 · Iowa

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Sibling

Uliana Frederick

Sibling · 1940 · age 35

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 — Woodbury-County, Iowa Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-01214-00974)

Line	Name	Age	Relation	Occupation	Birthplace
41	Karline Hazel Cortil	40	Head	—	Iowa
42	Floyd Hughes	28	Head	Trucker	Iowa
43	Helen G Hughes	23	Wife	—	Iowa
44	Charles Hughes	7	Son	—	Iowa
45	Vincent Hughes	6	Son	—	Iowa
46	Beverly Hughes	2	Daughter	—	Iowa
47	Ralph Cope	44	Head	Laborer	Iowa
48	Nellie Cope	43	Wife	—	Iowa
49	Jean Cope	17	Daughter	—	Iowa
50	Ardeth Cope	15	Daughter	—	Iowa
51	Audrey Cope	11	Daughter	—	Iowa
52	Laurel Cope	9	Daughter	—	Iowa
53	Charles Cope	8	Son	—	Iowa
54	Homer Hewitt	51	Head	Lineman	Pennsylvania
55	Kora Hewitt	41	Wife	—	Ohio
56	Dolly Hewitt	19	Daughter	Waitress	Arkansas
57	Parker Garland	50	Head	Laborer	Iowa
58	Lester Garland	17	Son	New Worker	Iowa
59	Donald Garland	15	Son	—	Iowa
60	Richard Garland	9	Son	—	Iowa
61	Joseph Rashins	43	Head	Laborer	Lithuania
62	Antonina Rashins	43	Wife	Laborer	Lithuania
63	Marian Rashins	16	Daughter	—	Iowa
64	Dominic Frederick	76	Head	—	Italy
65	Uliana Frederick	35	Daughter	—	Pennsylvania
66	John Frederick THIS PERSON	31	Son	Laborer	Iowa
67	Frank Cole	45	Head	Carpenter	Italy
68	Mary Cole	33	Wife	—	Italy
69	Mary Cole	16	Daughter	—	Iowa
70	Joseph Cole	13	Son	—	Iowa
71	Frank Jr. Cole	6	Son	—	Iowa
72	Mike Alono	76	Lodger	—	Italy
73	Wm Edward Jones	56	Head	Farmer	Iowa
74	Alma Jones	51	Wife	—	Iowa
75	Alvern Jones	30	Son	Laborer	Iowa
76	Fred E Weigel	40	Head	Attendant	Iowa
77	Esther Weigel	30	Wife	—	Nebraska
78	Phyllis Weigel	12	Daughter	—	Iowa
79	Jacqueline Weigel	7	Daughter	—	Iowa
80	Patricia Weigel	3	Daughter	—	Iowa

Search for John Frederick

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Pedigree Summary

John + 1 sibling

Gen 1 · 2 parents ~0.92

Max depth 4 (1900–1950 window)

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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