JH
John Hennessey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Linn-County, Iowa
Our Model Tree links this John Hennessey across the 1930 and 1940 US Censuses in Linn-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 8-person household.
Age 20
b. ~1920
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Linn-County, Iowa |
| Surname | Hennessey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Cedar Rapids |
| 1935 Residence (County) | Linn |
| Additional Details | |
| Occupation | News Boy |
| Industry | Laborer |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 0 |
| Highest Grade | H 1 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | News Boy |
| Township / Ward | Cedar Rapids |
| Est. Birth Year | ~1920 |
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 |
|---|---|---|---|---|
| William Hennessey | Son | — | 14 | ~1926 |
| John Hennessey | Son | — | 20 | ~1920 |
| Elizabeth Hennessey | Spouse | — | 45 | ~1895 |
| Michal Hennessey | Son | — | 23 | ~1917 |
| George Hennessey | Head | — | 50 | ~1890 |
| Merle Hennessey | Son | — | 24 | ~1916 |
| Robert Hennessey | Son | — | 16 | ~1924 |
| Mary Hennessey | Daughter | — | 6 | ~1934 |
Census Appearances
1930
Linn, Iowa
Son, age 9
Linn, Iowa · implied b. ~1921 — 50 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennessy |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Linn-County, Iowa
Son, age 20
Linn-County, Iowa · implied b. ~1920 — 8 household members
| Surname | Hennessey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Cedar Rapids |
| 1935 Residence (County) | Linn |
| Occupation | News Boy |
| Industry | Laborer |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 0 |
| Highest Grade | H 1 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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.
Our Model Tree links John Hennessey across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Hennessey
Son · 1940 · age 20 · b. ~1920 · Iowa
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Sibling
Michal Hennessey
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Hennessey
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Hennessey
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Merle Hennessey
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Hennessey
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 — Linn-County, Iowa
Open full size
1940 US Federal Census — Linn-County, Iowa
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01175-00948)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | George Hennessey | 50 | Head | Teamster | Iowa |
| 2 | Elizabeth Hennessey | 45 | Wife | — | Iowa |
| 3 | Merle Hennessey | 24 | Son | Cater Diggr | Iowa |
| 4 | Michal Hennessey | 23 | Son | Cater Diggr | Iowa |
| 5 | John Hennessey THIS PERSON | 20 | Son | News Boy | Iowa |
| 6 | Robert Hennessey | 16 | Son | Laborer | Iowa |
| 7 | William Hennessey | 14 | Son | — | Iowa |
| 8 | Mary E Hennessey | 6 | Daughter | — | Iowa |
| 9 | Fred Weber | 21 | Head | Salesman | Iowa |
| 10 | Dorothy Weber | 22 | Wife | — | Iowa |
| 11 | Fred Jr Weber | 1 | Son | — | Iowa |
| 12 | Charles Scott | 36 | Head | Boiler Maker | Iowa |
| 13 | Nellie Scott | 35 | Wife | — | Iowa |
| 14 | Charles Scott | 11 | Son | — | Iowa |
| 15 | Donald Scott | 9 | Son | — | Iowa |
| 16 | Ruth Scott | 7 | Daughter | — | Iowa |
| 17 | Helen Scott | 5 | Daughter | — | Iowa |
| 18 | Joseph Severe | 47 | Head | Careman | Illinois |
| 19 | Zelda Severe | 49 | Wife | — | Iowa |
| 20 | Wesley Severe | 26 | Son | Clean Up Man | Iowa |
| 21 | Warren Severe | 19 | Son | Labor | Iowa |
| 22 | Willis Severe | 14 | Son | — | Iowa |
| 23 | Norma Severe | 8 | Daughter | — | Iowa |
| 24 | Clarence Hanna | 51 | Head | Foreman | Iowa |
| 25 | Hazel Hanna | 49 | Wife | — | Iowa |
| 26 | Chester H Dunlap | 27 | Head | Welder | South Dakota |
| 27 | Helen Dunlap | 25 | Wife | — | Minnesota |
| 28 | Harold Hanna | 27 | Head | Service Man | Iowa |
| 29 | Marjorie Hanna | 24 | Wife | — | Iowa |
| 30 | William Hanna | 3 | Son | — | Iowa |
| 31 | Harold Jr Hanna | 1 | Son | — | Iowa |
| 32 | Arthur Hanna | 28 | Head | Milk Watchman | Iowa |
| 33 | Thelma Hanna | 30 | Wife | — | Iowa |
| 34 | Frank Sullivan | 52 | Head | Yard Master | Iowa |
| 35 | Bess Sullivan | 48 | Wife | — | Iowa |
| 36 | Marjorie Sullivan | 19 | Daughter | Stenographer | Iowa |
| 37 | Laverne Budd | 24 | Head | Electrician | Iowa |
| 38 | Helen Budd | 24 | Wife | — | Iowa |
| 39 | Nora Norton | 59 | Mother in law | — | Missouri |
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)