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John Mcdonnell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Clinton-County, Iowa
Our Model Tree links this John Mcdonnell across the 1930 and 1940 US Censuses in Clinton-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1922), then head of a 8-person household.
Age 18
b. ~1922
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Clinton-County, Iowa |
| Surname | McDonnell |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Clinton City |
| 1935 Residence (County) | Clinton |
| Additional Details | |
| Occupation | Laborer |
| Industry | Toy Factory |
| Class of Worker | PW |
| Hours Worked | 20 |
| Income (1939) | 100 |
| Highest Grade | G-8 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Laborer |
| Township / Ward | Clinton City |
| Est. Birth Year | ~1922 |
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 |
|---|---|---|---|---|
| Joan Mcdonnell | Daughter | — | 7 | ~1933 |
| Ellen Mcdonnell | Spouse | — | 44 | ~1896 |
| John Mcdonnell | Son | — | 18 | ~1922 |
| William Mcdonnell | Head | — | 46 | ~1894 |
| Robert Mcdonnell | Son | — | 13 | ~1927 |
| William Mcdonnell | Son | — | 4 | ~1936 |
| Herbert Mcdonnell | Son | — | 12 | ~1928 |
| Grace Mcdonnell | Daughter | — | 16 | ~1924 |
Census Appearances
1930
Clinton, Iowa
Son, age 8
Clinton, Iowa · implied b. ~1922 — 50 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonnell |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Clinton-County, Iowa
Son, age 18
Clinton-County, Iowa · implied b. ~1922 — 8 household members
| Surname | McDonnell |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Clinton City |
| 1935 Residence (County) | Clinton |
| Occupation | Laborer |
| Industry | Toy Factory |
| Class of Worker | PW |
| Hours Worked | 20 |
| Income (1939) | 100 |
| Highest Grade | G-8 |
| 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 Mcdonnell across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mcdonnell
Son · 1940 · age 18 · b. ~1922 · Iowa
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Sibling
Joan Mcdonnell
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Herbert Mcdonnell
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Mcdonnell
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mcdonnell
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Grace Mcdonnell
Sibling · 1940 · age 16
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 — Clinton-County, Iowa
Open full size
1940 US Federal Census — Clinton-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01150-00622)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Merritt Scott | 59 | Head | Engineer | Iowa |
| 42 | Mabel Scott | 55 | Wife | — | Iowa |
| 43 | Maxine Scott | 20 | Daughter | — | Iowa |
| 44 | Rae E. Scott | 17 | Daughter | — | Iowa |
| 45 | Charles Hageman | 35 | Head | Foreman | Illinois |
| 46 | Glad Hageman | 35 | Wife | — | Illinois |
| 47 | Helen Hageman | 15 | Daughter | — | Illinois |
| 48 | Marmy Hageman | 12 | Son | — | Illinois |
| 49 | Donald Hageman | 10 | Son | — | Illinois |
| 50 | Joan Hageman | 7 | Daughter | — | Illinois |
| 51 | Arlyne Hageman | 4 | Daughter | — | Iowa |
| 52 | Richard Hageman | 3 | Son | — | Iowa |
| 53 | Nancy Hageman | 1 | Daughter | — | Iowa |
| 54 | William Mcdonnell | 46 | Head | Laborer | Iowa |
| 55 | Ellen Mcdonnell | 44 | Wife | — | Iowa |
| 56 | John Mcdonnell THIS PERSON | 18 | Son | Laborer | Iowa |
| 57 | Grace Mcdonnell | 16 | Daughter | — | Iowa |
| 58 | Robert Mcdonnell | 13 | Son | — | Iowa |
| 59 | Herbert Mcdonnell | 12 | Son | — | Iowa |
| 60 | Joan Mcdonnell | 7 | Daughter | — | Iowa |
| 61 | William Jr. Mcdonnell | 4 | Son | — | Iowa |
| 62 | Edward M. Smith | 70 | Head | Pattern Maker | Iowa |
| 63 | Mart Smith | 56 | Wife | — | Iowa |
| 64 | Marjorie Smith | 25 | Daughter | — | Iowa |
| 65 | Alice Ireland | 60 | Head | Manager | Iowa |
| 66 | Glenn Ireland | 29 | Son | Manager | Illinois |
| 67 | Anna H. Ireland | 24 | Daughter | Clerk | Illinois |
| 68 | Peter Lind | 85 | Father | — | Denmark |
| 69 | Alfred Carlsen | 41 | Head | Stationary Fireman | Iowa |
| 70 | Mabel Carlsen | 43 | Wife | — | Iowa |
| 71 | William Carlsen | 21 | Son | Laborer | Iowa |
| 72 | Catherine Carlsen | 19 | Daughter | Seamstress | Iowa |
| 73 | Vernon Carlsen | 20 | Son | Clerk In Office | Iowa |
| 74 | Nellie Grody | 74 | Head | — | Illinois |
| 75 | Nels Jorgensen | 50 | Head | Brakeman | Denmark |
| 76 | Frieda Jorgensen | 50 | Wife | — | Germany |
| 77 | Martha Rehm | 70 | Head | — | Germany |
| 78 | Fred Butzer | 64 | Lodger | Laborer | Illinois |
| 79 | Peter Krajnovich | 25 | Head | Laborer | Illinois |
| 80 | Ella Krajnovich | 23 | Wife | — | Iowa |
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)