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John Donnelly — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Will-County, Illinois
Our Model Tree links this John Donnelly across the 1930 and 1940 US Censuses in Will-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1926), then head of a 10-person household.
Age 14
b. ~1926
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Will-County, Illinois |
| Surname | Donnelly |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Joliet Twp. |
| 1935 Residence (County) | Will |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Joliet Twp |
| Est. Birth Year | ~1926 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| William Donnelly | Head | — | 51 | ~1889 |
| Annie Donnelly | Other | — | 6 | ~1934 |
| Gerald Donnelly | Son | — | 12 | ~1928 |
| John Donnelly | Son | — | 14 | ~1926 |
| William Donnelly | Son | — | 16 | ~1924 |
| Daniel Donnelly | Son | — | 4 | ~1936 |
| George Donnelly | Son | — | 2 | ~1938 |
| Arthur Donnelly | Son | — | 9 | ~1931 |
| Peter Donnelly | Son | — | 15 | ~1925 |
| Veronica Donnelly | Spouse | — | 41 | ~1899 |
Census Appearances
1930
Will, Illinois
Son, age 4
Will, Illinois · implied b. ~1926 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donnelly |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Will-County, Illinois
Son, age 14
Will-County, Illinois · implied b. ~1926 — 10 household members
| Surname | Donnelly |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Joliet Twp. |
| 1935 Residence (County) | Will |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| 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 Donnelly across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Donnelly
Son · 1940 · age 14 · b. ~1926 · Illinois
★ You are viewing this record
Sibling
Gerald Donnelly
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Daniel Donnelly
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arthur Donnelly
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Peter Donnelly
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Donnelly
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Donnelly
Sibling · 1940 · age 2
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 — Will-County, Illinois
Open full size
1940 US Federal Census — Will-County, Illinois
Page Contents
36 people indexed on this census page (nara:1940:m-t0627-00909-00235)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Rosa Kunzman | 82 | Head | — | Switzerland |
| 42 | William Donnelly | 51 | Head | Block Cutter | Scotland |
| 43 | Veronica Donnelly | 41 | Wife | — | Illinois |
| 44 | William Jr. Donnelly | 16 | Son | Pinsetter | Illinois |
| 45 | Peter Donnelly | 15 | Son | Paper Boy | Illinois |
| 46 | John Donnelly THIS PERSON | 14 | Son | — | Illinois |
| 47 | Gerald Donnelly | 12 | Son | — | Illinois |
| 48 | Arthur Donnelly | 9 | Son | — | Illinois |
| 49 | Annie Donnelly | 6 | Dau | — | Illinois |
| 50 | Daniel Donnelly | 4 | Son | — | Illinois |
| 51 | George Donnelly | 2 | Son | — | Illinois |
| 53 | Fred A. Martinsen | 24 | Head | Owner | Illinois |
| 54 | Amis Martinsen | 39 | Wife | — | Pennsylvania |
| 55 | Daniel Pompie | 41 | Head | Buyer | Illinois |
| 56 | Anna Jean Pompie | 4 | Dau | — | Illinois |
| 57 | Peter Pompie | 51 | Brother | — | Illinois |
| 58 | John Schorie | 19 | Head | — | New York |
| 59 | Bertha Schorie | 64 | Wife | — | Illinois |
| 60 | George Dennison | 35 | Head | Color Mixer | Iowa |
| 61 | Helen Dennison | 30 | Wife | — | Illinois |
| 62 | Patricia Ann Dennison | 5 | Dau | — | Illinois |
| 63 | Sarah Dennison | 77 | Mother | — | England |
| 64 | Maud Cisicze | 53 | Head | — | New Mexico |
| 65 | Howard Johnson | 30 | Head | Plumber | Illinois |
| 66 | Alice Johnson | 24 | Wife | — | Missouri |
| 68 | Jacob Engimann | 79 | Head | — | Switzerland |
| 69 | Alice Engimann | 69 | Wife | — | Illinois |
| 70 | James Mcconnell | 45 | Head | Flagman | Illinois |
| 71 | Frances Mcconnell | 41 | Wife | — | Michigan |
| 72 | Virginia Mcconnell | 17 | Dau | — | Illinois |
| 73 | Bertha Stremen | 64 | Head | — | Illinois |
| 74 | Viola Watling | 35 | Dau | Inspector | Illinois |
| 75 | Henry Dahl | 43 | Head | Carpenter | Sweden |
| 76 | Sally Dahl | 36 | Wife | — | Sweden |
| 77 | Carl Dahl | 2 | Son | — | Illinois |
| 78 | Ingrid Dahl | 10 | Dau | — | 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)