John Hoffman — 1940 US Census Record

Model Tree available

1940 United States Federal Census · Black-Hawk-County, Iowa

Our Model Tree links this John Hoffman across the 1920, 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed), with identified parents C & Margaret — first a head (b.~1907), then head of a 5-person household.

Age 33 b. ~1907 Male Head Born: Iowa Married

1940 Census Record Details

Census Year	1940
Location	Black-Hawk-County, Iowa
Surname	Hoffman
Given Name	John M
Relationship to Head	Head
Sex	M
Color / Race	White
Age	33
Marital Status	Married
Birthplace	Iowa
1935 Residence (City)	Waterloo City
1935 Residence (County)	Black Hawk
Additional Details
Occupation	Machine Operator
Industry	Tractor factory
Class of Worker	PW
Hours Worked	40
Income (1939)	1448
Highest Grade	H 3
1935 Residence	Same house
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa
Occupation	Machine Operator
Township / Ward	Waterloo City
Est. Birth Year	~1907

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.

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

Name	Relation to head	Relative to John	Age	Birth yr
John Hoffman	Head	—	33	~1907
Marion Hoffman	Son	—	15	~1925
Roger Hoffman	Son	—	13	~1927
Lyle Hoffman	Son	—	12	~1928
Avis Hoffman	Spouse	—	32	~1908

Census Appearances

1920

Blackhawk, Iowa

Son, age 12

Blackhawk, Iowa · implied b. ~1908 — 5 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Hofman
Given Name	John
Relationship to Head	Son
Sex	M
Color / Race	White
Age	12
Marital Status	Single
Birthplace	Iowa
Father's Birthplace	New York
Mother's Birthplace	Iowa
Occupation	none
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

1930

Black Hawk, …

Head, age 23

Black Hawk, Iowa · implied b. ~1907 — 5 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Hoffman
Given Name	John M.
Relationship to Head	Head
Sex	M
Color / Race	White
Age	23
Marital Status	Married
Birthplace	Iowa
Age at First Marriage	18
Father's Birthplace	New York
Mother's Birthplace	Iowa
Occupation	Oiler
Industry	Tractor factory
Class of Worker	W
Can Read/Write	Yes
Home Owned/Rented	O
Home Value / Rent	1000
Veteran	No
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

1940

Black-Hawk-County, Iowa

Head, age 33

Black-Hawk-County, Iowa · implied b. ~1907 — 5 household members

Surname	Hoffman
Given Name	John M
Relationship to Head	Head
Sex	M
Color / Race	White
Age	33
Marital Status	Married
Birthplace	Iowa
1935 Residence (City)	Waterloo City
1935 Residence (County)	Black Hawk
Occupation	Machine Operator
Industry	Tractor factory
Class of Worker	PW
Hours Worked	40
Income (1939)	1448
Highest Grade	H 3
1935 Residence	Same house
Birth State	Iowa
Birth Country	United States
Birthplace (normalized)	iowa

Model Tree

Model Tree available

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

Show:

Gen 1 Parents confidence ≈ 0.92

Father

C Hofman

b. ~1858

Source father

● Household · direct · ~0.92

Mother

Margaret Hofman

b. ~1868

Source mother

● Household · direct · ~0.92

This person

Anchor record

John Hoffman

Head · 1940 · age 33 · b. ~1907 · Iowa

★ You are viewing this record

Confirmed / household (~0.90+) Probable / derived (~0.65–0.89) Candidate (<0.65, unverified)

Original Census Page

1940 US Federal Census — Black-Hawk-County, Iowa Open full size

Page Contents

36 people indexed on this census page (nara:1940:m-t0627-01139-00763)

Line	Name	Age	Relation	Occupation	Birthplace
1	Patricia Ann Dietz	4	Daughter	—	Iowa
2	Wallace L Dietz	2	Son	—	Iowa
4	Ireland Hickman	31	Head	Coremaker	Missouri
5	Nellie M Hickman	28	Wife	Seamstress	Iowa
6	Doyle L Bosnell	29	Head	Millwright	Oklahoma
7	Dorothy E Bosnell	24	Wife	—	Minnesota
8	John M Hoffman THIS PERSON	33	Head	Machine Operator	Iowa
9	Avis L Hoffman	32	Wife	—	Iowa
10	Marion Hoffman	15	Son	—	Iowa
11	Roger Hoffman	13	Son	—	Iowa
12	Lyle M Hoffman	12	Son	—	Iowa
13	Burt E Mathews	68	Head	Proprietor	Iowa
14	Della D Mathews	64	Wife	—	Iowa
15	Glen C Brown	52	Head	—	Iowa
16	Mayme I Brown	62	Wife	—	Iowa
18	Charles F Calleas	65	Head	—	Germany
19	Margaret Shaffer	32	Daughter	—	Iowa
20	Sandra Lee Shaffer	5	Granddaughter	—	Iowa
22	Edward A Schneck	29	Head	Inspector	Iowa
23	Hulda Schneck	28	Wife	Seamstress	Iowa
24	Donna P Schneck	8	Daughter	—	Iowa
25	Arnold Schneck	7	Son	—	Iowa
26	Florence P Stone	49	Mother	—	Kansas
27	Dick A Berghaus	36	Head	Coremaker	Iowa
28	Frances E Berghaus	31	Wife	—	Iowa
29	Phyllis L Berghaus	15	Daughter	—	Iowa
30	Jesse A Crawford	30	Head	Machinist	Iowa
31	Ann Crawford	32	Wife	—	Iowa
32	Ivan D Beazley	37	Head	Machinist	Iowa
33	Nellie M Beazley	26	Wife	—	Missouri
34	Kenneth G Clough	34	Head	Sand Slinger	Iowa
35	Jack C Clough	10	Son	—	Indiana
36	Billy R Clough	8	Son	—	Iowa
37	Patsy J Clough	5	Daughter	—	Iowa
39	Clarence A Sackett	62	Head	Tool Grinder	Iowa
40	Louise M Sackett	53	Wife	—	Switzerland

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Pedigree Summary

John

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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