WD
William Donnelly — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Donnelly across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1921), then head of a 6-person household.
Age 19
b. ~1921
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Donnelly |
| Given Name | William H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Apprentice Electrician |
| Industry | Building Construction |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 300 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Apprentice Electrician |
| Township / Ward | Chicago |
| Est. Birth Year | ~1921 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Jeanette Donnelly | Daughter | — | 4 | ~1936 |
| Catherine Donnelly | Spouse | — | 45 | ~1895 |
| William Donnelly | Head | — | 47 | ~1893 |
| Robert Donnelly | Son | — | 15 | ~1925 |
| Raymond Donnelly | Son | — | 13 | ~1927 |
| William Donnelly | Son | — | 19 | ~1921 |
Census Appearances
1930
Cook, Illinois
Son, age 8
Cook, Illinois · implied b. ~1922 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donnelly |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 19
Cook-County, Illinois · implied b. ~1921 — 6 household members
| Surname | Donnelly |
| Given Name | William H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Apprentice Electrician |
| Industry | Building Construction |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 300 |
| Highest Grade | H 4 |
| 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 William Donnelly across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Donnelly
Son · 1940 · age 19 · b. ~1921 · Illinois
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Sibling
Robert Donnelly
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jeanette Donnelly
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Donnelly
Sibling · 1940 · age 13
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-t0627-00956-00992)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John P. Mcfarland | 14 | Son | — | Illinois |
| 42 | Francis J. Mcfarland | 12 | Son | — | Illinois |
| 43 | Sarah Urchell | 67 | Head | — | Italy |
| 44 | Michael Eschen | 40 | Son | Laborer | Illinois |
| 45 | Louis Urchell | 35 | Son | Laborer | Illinois |
| 46 | Joseph Urchell | 30 | Son | Truck Driver | Illinois |
| 47 | Mary Garstang | 34 | Daughter | Receptionist | Illinois |
| 48 | George Garstang | 34 | Son-in-law | Collector | Illinois |
| 49 | William H. Donnelly | 47 | Head | Electrician | Illinois |
| 50 | Catherine Donnelly | 45 | Wife | — | Illinois |
| 51 | William H. Donnelly THIS PERSON | 19 | Son | Apprentice Electrician | Illinois |
| 52 | Robert E. Donnelly | 15 | Son | — | Illinois |
| 53 | Raymond J. Donnelly | 13 | Son | — | Illinois |
| 54 | Jeanette M. Donnelly | 4 | Daughter | — | Illinois |
| 55 | George A. Hamil | 63 | Head | Switchman | Pennsylvania |
| 56 | Carrie Hamil | 64 | Wife | — | Pennsylvania |
| 57 | Bruce E. Hamil | 23 | Son | Benchman | Illinois |
| 58 | Evelyn Holmes | 33 | Daughter | Telephone Operator | Pennsylvania |
| 59 | Audrey Holmes | 7 | Grand-daughter | — | Illinois |
| 60 | Milton Adams | 46 | Head | Stock Handler | Illinois |
| 61 | Mildred Adams | 41 | Wife | — | Illinois |
| 62 | Robert Adams | 19 | Son | Messenger | Illinois |
| 63 | Charles Adams | 16 | Son | — | Illinois |
| 64 | Betty Adams | 15 | Daughter | — | Illinois |
| 65 | Shirley Adams | 10 | Daughter | — | Illinois |
| 66 | Spero Lampas | 35 | Head | Painters Helper | Greece |
| 67 | Stella Lampas | 29 | Wife | — | Illinois |
| 68 | Constantine Lampas | 5 | Son | — | Illinois |
| 69 | George Boras | 58 | Head | Painter | Greece |
| 70 | Helen Boras | 26 | Daughter | Housework | Illinois |
| 71 | William Boras | 24 | Son | Clerk | Illinois |
| 72 | Peter Boras | 21 | Son | Apprentice Painter | Illinois |
| 73 | Alex Boras | 19 | Son | Cashier | Illinois |
| 74 | Kathryn Winterly | 71 | Head | — | Illinois |
| 75 | James H. Van Scotten | 37 | Son-in-law | Salesman | Illinois |
| 76 | Margaret Van Scotten | 33 | Daughter | — | Illinois |
| 77 | Neil Van Scotten | 1 | Grandson | — | Illinois |
| 78 | Samuel Davies | 34 | Lodger | — | England |
| 79 | Margaret O'Neil | 52 | Head | — | Irish Free State |
| 80 | John O'Neil | 23 | Son | Freight Handler | 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)