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John Mcdonough — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Mcdonough across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1922), then head of a 13-person household.
Age 18
b. ~1922
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | McDonough |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| 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.
13 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Eleanor Mcdonough | Daughter | — | 20 | ~1920 |
| Patricia Mcdonough | Daughter | — | 13 | ~1927 |
| Mary Mcdonough | Daughter | — | 2 | ~1938 |
| Ann Mcdonough | Daughter | — | 8 | ~1932 |
| Delores Mcdonough | Daughter | — | 19 | ~1921 |
| Katherine Mcdonough | Daughter | — | 7 | ~1933 |
| Eileen Mcdonough | Daughter | — | 4 | ~1936 |
| John Mcdonough | Head | — | 46 | ~1894 |
| Francis Mcdonough | Son | — | 11 | ~1929 |
| Bernard Mcdonough | Son | — | 15 | ~1925 |
| James Mcdonough | Son | — | 5 | ~1935 |
| John Mcdonough | Son | — | 18 | ~1922 |
| Katherine Mcdonough | Spouse | — | 43 | ~1897 |
Census Appearances
1930
Cook, Illinois
Son, age 8
Cook, Illinois · implied b. ~1922 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonough |
| Given Name | John Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 18
Cook-County, Illinois · implied b. ~1922 — 13 household members
| Surname | McDonough |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Mcdonough across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mcdonough
Son · 1940 · age 18 · b. ~1922 · Illinois
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Sibling
Eleanor Mcdonough
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Mcdonough
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eileen Mcdonough
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mcdonough
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ann Mcdonough
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Katherine Mcdonough
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernard Mcdonough
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Delores Mcdonough
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mcdonough
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Mcdonough
Sibling · 1940 · age 11
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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00956-00571)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Clarence Tewksbury | 57 | Head | Clerk | Illinois |
| 42 | Elva Tewksbury | 53 | Wife | — | Pennsylvania |
| 43 | Harry R. Tewksbury | 19 | Son | — | Illinois |
| 44 | Clarence W. Jr. Tewksbury | 17 | Son | — | Illinois |
| 45 | Elva E. Tewksbury | 15 | Daughter | — | Illinois |
| 46 | Ella M. Richards | 86 | Mother in law | — | Illinois |
| 47 | Homer Mullen | 70 | Head | — | Illinois |
| 48 | Nellie S. Mullen | 68 | Wife | — | Illinois |
| 49 | Alex Benson | 67 | Head | Boiler Washer | Sweden |
| 50 | Augusta Benson | 59 | Wife | — | Illinois |
| 51 | Andrew Newman | 46 | Head | Printer | Illinois |
| 52 | Elizabeth Newman | 46 | Wife | — | Illinois |
| 53 | John Newman | 12 | Son | — | Illinois |
| 54 | William Newman | 10 | Son | — | Illinois |
| 55 | Henry Coert | 50 | Head | Salesman | Holland |
| 56 | Johanna Coert | 47 | Wife | — | Holland |
| 57 | Henry Jr. Coert | 18 | Son | Clerk | Illinois |
| 58 | Jeanne Coert | 14 | Daughter | — | Illinois |
| 59 | Albert F. Grinde | 46 | Head | Contractor | Minnesota |
| 60 | La Rue Grinde | 44 | Wife | Operator | Tennessee |
| 61 | Ann Grinde | 13 | Daughter | — | Illinois |
| 62 | Mary Brown | 72 | Mother | — | Tennessee |
| 63 | Art Olander | 35 | Head | Pattern Maker | Illinois |
| 64 | Carleene Olander | 35 | Wife | — | Tennessee |
| 65 | Kenneth Olander | 8 | Son | — | Illinois |
| 66 | Gail Olander | 3 | Daughter | — | Illinois |
| 67 | Norma Olander | 0 | Daughter | — | Illinois |
| 68 | John Mcdonough | 46 | Head | Policeman | Illinois |
| 69 | Katherine Mcdonough | 43 | Wife | — | Illinois |
| 70 | Eleanor Mcdonough | 20 | Daughter | Operator | Illinois |
| 71 | Delores Mcdonough | 19 | Daughter | — | Illinois |
| 72 | John Jr. Mcdonough THIS PERSON | 18 | Son | — | Illinois |
| 73 | Bernard Mcdonough | 15 | Son | — | Illinois |
| 74 | Patricia Mcdonough | 13 | Daughter | — | Illinois |
| 75 | Francis Mcdonough | 11 | Son | — | Illinois |
| 76 | Ann Marie Mcdonough | 8 | Daughter | — | Illinois |
| 77 | Katherine Mcdonough | 7 | Daughter | — | Illinois |
| 78 | James Mcdonough | 5 | Son | — | Illinois |
| 79 | Eileen Mcdonough | 4 | Daughter | — | Illinois |
| 80 | Mary Ann Mcdonough | 2 | Daughter | — | Illinois |
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)