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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 head (b.~1890), then head of a 9-person household.
Age 50
b. ~1890
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Clinton-County, Iowa |
| Surname | McDonnell |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Clinton City |
| 1935 Residence (County) | Clinton |
| Additional Details | |
| Occupation | Welder |
| Industry | Chicago Northwestern Railway |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1664 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Welder |
| Township / Ward | Clinton City |
| Est. Birth Year | ~1890 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Rita Mcdonnell | Daughter | — | 14 | ~1926 |
| Eugene Mcdonnell | Son | — | 13 | ~1927 |
| Gerald Mcdonnell | Son | — | 18 | ~1922 |
| Mary Mcdonnell | Spouse | — | 47 | ~1893 |
| Paul Mcdonnell | Son | — | 21 | ~1919 |
| John Mcdonnell | Head | — | 50 | ~1890 |
| Robert Mcdonnell | Son | — | 17 | ~1923 |
| Charles Mcdonnell | Son | — | 10 | ~1930 |
| Natalie Mcdonnell | Daughter | — | 20 | ~1920 |
Census Appearances
1930
Clinton, Iowa
Son, age 39
Clinton, Iowa · implied b. ~1891 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonald |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Clinton-County, Iowa
Head, age 50
Clinton-County, Iowa · implied b. ~1890 — 9 household members
| Surname | McDonnell |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Clinton City |
| 1935 Residence (County) | Clinton |
| Occupation | Welder |
| Industry | Chicago Northwestern Railway |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1664 |
| Highest Grade | No 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.
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This person
Anchor record
John Mcdonnell
Head · 1940 · age 50 · b. ~1890 · Iowa
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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-t0627-01150-00795)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Earl, Jr. Gaudey | 41 | Head | Poultry Packer | Iowa |
| 2 | Earlene Gaudey | 40 | Wife | — | Iowa |
| 3 | Doris Jean Gaudey | 9 | Daughter | — | Iowa |
| 4 | Ella Smith | 61 | Mother-in-law | — | Iowa |
| 5 | August C. Petersen | 45 | Head | Plumber | Iowa |
| 6 | Gladys Petersen | 40 | Wife | — | Iowa |
| 7 | Phyllis J. Petersen | 16 | Daughter | — | Iowa |
| 8 | Frederick C. Petersen | 13 | Son | — | Iowa |
| 9 | Hulda Scofield | 68 | Mother-in-law | — | Iowa |
| 10 | John Cladney | 55 | Head | Laborer | Iowa |
| 11 | Mary Cladney | 59 | Wife | — | Iowa |
| 12 | Ambrose Clancy | 57 | Head | County Auditor | Iowa |
| 13 | Loretta Clancy | 34 | Daughter | Office Clerk | Iowa |
| 14 | Rose Clancy | 26 | Daughter | Car Inspector | Iowa |
| 15 | Martin Clancy | 18 | Son | — | Iowa |
| 16 | Nancy Costello | 45 | Sister-in-law | Friend Nurse | Ohio |
| 17 | Elizabeth Longman | 25 | Granddaughter | — | Minnesota |
| 18 | Thomas Douglas | 8 | Grandson | — | Iowa |
| 19 | Victor L. Lawton | 51 | Head | Carpenter | Illinois |
| 20 | Mary D. Lawton | 52 | Wife | — | Illinois |
| 21 | Betty Lou Lawton | 19 | Daughter | Wrapper | Illinois |
| 22 | Harry S. Lawton | 13 | Son | — | Illinois |
| 23 | John Mcdonnell THIS PERSON | 50 | Head | Welder | Iowa |
| 24 | Mary Mcdonnell | 47 | Wife | — | Iowa |
| 25 | Paul Mcdonnell | 21 | Son | Truck-Driver | Iowa |
| 26 | Natalie Mcdonnell | 20 | Daughter | Book-Keeper | Iowa |
| 27 | Gerald Mcdonnell | 18 | Son | Apprentice | Iowa |
| 28 | Robert Mcdonnell | 17 | Son | Clerk | Iowa |
| 29 | Rita Mcdonnell | 14 | Daughter | — | Iowa |
| 30 | Eugene Mcdonnell | 13 | Son | — | Iowa |
| 31 | Charles Mcdonnell | 10 | Son | — | Iowa |
| 32 | Boyd Ferguson | 31 | Head | Metal Worker | Iowa |
| 33 | Helen Ferguson | 25 | Wife | — | Missouri |
| 34 | George Fleming | 67 | Head | Machinist | Iowa |
| 35 | Ida Fleming | 67 | Wife | — | Illinois |
| 36 | Henry Harn | 59 | Head | Stationary Engineer | Germany |
| 37 | Myrtle Harn | 51 | Wife | — | Iowa |
| 38 | Myron Pattrowski | 18 | Lodger | Messenger Boy | Minnesota |
| 39 | Louis Craft | 55 | Head | Mechanic | Iowa |
| 40 | Clara Craft | 35 | Wife | — | Illinois |
Related Census Records
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)