WM
William Macdonald — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Macdonald across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 8-person household.
Age 17
b. ~1923
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | MacDonald |
| Given Name | William |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1923 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| William Macdonald | Son | — | 17 | ~1923 |
| Catherine Macdonald | Daughter | — | 19 | ~1921 |
| Anne Macdonald | Daughter | — | 8 | ~1932 |
| Mary Macdonald | Daughter | — | 15 | ~1925 |
| Edward Macdonald | Head | — | 54 | ~1886 |
| Helen Macdonald | Spouse | — | 51 | ~1889 |
| Ed Macdonald | Son | — | 18 | ~1922 |
| John Macdonald | Son | — | 12 | ~1928 |
Census Appearances
1930
Cook, Illinois
Son, age 7
Cook, Illinois · implied b. ~1923 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonald |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 17
Cook-County, Illinois · implied b. ~1923 — 8 household members
| Surname | MacDonald |
| Given Name | William |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| 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 Macdonald across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Macdonald
Son · 1940 · age 17 · b. ~1923 · Illinois
★ You are viewing this record
Sibling
Ed Macdonald
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Macdonald
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Macdonald
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Macdonald
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anne Macdonald
Sibling · 1940 · age 8
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
39 people indexed on this census page (nara:1940:m-t0627-01002-00081)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Alvin Potocki | 5 | lodger | — | Illinois |
| 42 | Charles Harnew | 69 | head | — | Illinois |
| 43 | Margaret Harnew | 54 | wife | — | Minnesota |
| 44 | Walter Harnew | 20 | son | Draftsman | Illinois |
| 45 | Louise Harnew | 77 | sister | — | Illinois |
| 46 | Edward Macdonald | 54 | head | Medical Doctor | Illinois |
| 47 | Helen Macdonald | 51 | wife | — | Wisconsin |
| 48 | Catherine Macdonald | 19 | daughter | — | Illinois |
| 49 | Ed Macdonald | 18 | son | Delivery Boy | Illinois |
| 50 | William Macdonald THIS PERSON | 17 | son | — | Illinois |
| 51 | Mary Jane Macdonald | 15 | daughter | — | Illinois |
| 52 | John Macdonald | 12 | son | — | Illinois |
| 53 | Anne Macdonald | 8 | daughter | — | Illinois |
| 54 | Sidney T. Burtness | 47 | head | Accounting | Illinois |
| 55 | Margaret Burtness | 42 | wife | — | Illinois |
| 56 | Paul Burtness | 16 | son | — | Illinois |
| 57 | Theodore Burtness | 13 | son | — | Illinois |
| 58 | George Barker | 46 | head | Projectionist | Illinois |
| 59 | Katherine Barker | 47 | wife | — | Illinois |
| 60 | Andrew Barker | 17 | son | — | Illinois |
| 61 | Julius W. Verhaag | 65 | head | Baker/Pastry | Illinois |
| 62 | Etta Verhaag | 64 | wife | — | Germany |
| 63 | Virginia Verhaag | 23 | daughter | Typist | Illinois |
| 64 | Jane Pettigrew | 66 | head | — | Illinois |
| 65 | Martha Pettigrew | 34 | daughter | Grade School Teacher | Illinois |
| 66 | Ruth Pettigrew | 29 | daughter | Grade School Teacher | Illinois |
| 67 | Sidney Carlson | 41 | head | Clerk | Illinois |
| 68 | Dora Carlson | 44 | wife | — | Illinois |
| 69 | Doris Carlson | 11 | daughter | — | Illinois |
| 70 | Virginia Carlson | 7 | daughter | — | Illinois |
| 71 | Lionel Hirsch | 66 | head | Tanner | Iowa |
| 72 | Violette Hirsch | 59 | wife | — | Michigan |
| 73 | Lionel Jr. Hirsch | 22 | son | Reporter | Illinois |
| 74 | Robert H. Pooler | 53 | brother-in-law | — | Michigan |
| 75 | William H. Schlake | 50 | head | President | Illinois |
| 76 | Irene Schlake | 48 | wife | — | Illinois |
| 77 | Ruth Schlake | 20 | daughter | — | Illinois |
| 78 | William Schlake | 19 | son | — | Illinois |
| 79 | Fritz Holle | 40 | cousin-in-law | Electrician | Germany |
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)