JM
James Mcdonald — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this James Mcdonald across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1931), then head of a 12-person household.
Age 9
b. ~1931
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | McDonald |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | 2 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Illinois |
| Est. Birth Year | ~1931 |
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.
12 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Nanette Mcdonald | Daughter | — | 8 | ~1932 |
| Eleanor Mcdonald | Daughter | — | 6 | ~1934 |
| Cecelia Mcdonald | Daughter | — | 10 | ~1930 |
| Loretta Mcdonald | Daughter | — | 12 | ~1928 |
| Roy Mcdonald | Head | — | 45 | ~1895 |
| John Mcdonald | Son | — | 14 | ~1926 |
| Roy Mcdonald | Son | — | 18 | ~1922 |
| Christopher Mcdonald | Son | — | 18 | ~1922 |
| Joseph Mcdonald | Son | — | 13 | ~1927 |
| James Mcdonald | Son | — | 9 | ~1931 |
| Daniel Mcdonald | Son | — | 4 | ~1936 |
| Louetta Mcdonald | Spouse | — | 45 | ~1895 |
Census Appearances
1930
Cook, Illinois
Son, age
Cook, Illinois · implied b. ~1930 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Macdonald |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 9
Cook-County, Illinois · implied b. ~1931 — 12 household members
| Surname | McDonald |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Highest Grade | 2 |
| 1935 Residence | Illinois |
| 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 James Mcdonald across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Mcdonald
Son · 1940 · age 9 · b. ~1931 · Illinois
★ You are viewing this record
Sibling
Christopher Mcdonald
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nanette Mcdonald
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Daniel Mcdonald
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcdonald
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Loretta Mcdonald
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Roy Mcdonald
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Mcdonald
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eleanor Mcdonald
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cecelia Mcdonald
Sibling · 1940 · age 10
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
38 people indexed on this census page (nara:1940:m-t0627-00785-00938)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Harriet Mcneil | 39 | Head | — | Poland |
| 2 | Dorothy Mcneil | 17 | Daughter | — | Illinois |
| 3 | Jane Mcneil | 12 | Daughter | — | Illinois |
| 4 | Marion Mcneil | 11 | Daughter | — | Illinois |
| 5 | John Mcneil | 9 | Son | — | Illinois |
| 6 | Lorraine Mcneil | 7 | Daughter | — | Illinois |
| 7 | Estelle Mcneil | 6 | Daughter | — | Illinois |
| 8 | Roy A. Mcdonald | 45 | Head | — | Illinois |
| 9 | Louetta Mcdonald | 45 | Wife | — | Illinois |
| 10 | Roy A. Jr. Mcdonald | 18 | Son | Laundry Helper | Illinois |
| 11 | Christopher Mcdonald | 18 | Son | Laundry Helper | Illinois |
| 12 | John Mcdonald | 14 | Son | — | Illinois |
| 13 | Joseph Mcdonald | 13 | Son | — | Illinois |
| 14 | Loretta Mcdonald | 12 | Daughter | — | Illinois |
| 15 | Cecelia Mcdonald | 10 | Daughter | — | Illinois |
| 16 | James Mcdonald THIS PERSON | 9 | Son | — | Illinois |
| 17 | Nanette Mcdonald | 8 | Daughter | — | Illinois |
| 18 | Eleanor Mcdonald | 6 | Daughter | — | Illinois |
| 19 | Daniel Mcdonald | 4 | Son | — | Illinois |
| 20 | Lloyd Gordham | 29 | Head | Mechanic | Illinois |
| 21 | Margaret Gordham | 27 | Wife | — | Illinois |
| 22 | Lloyd Jr. Gordham | 5 | Son | — | Illinois |
| 23 | Joseph De Laron | 29 | Head | Secretary Treasurer | Illinois |
| 24 | Eleanor De Laron | 28 | Wife | — | Illinois |
| 25 | Joseph Jr. De Laron | 5 | Son | — | Illinois |
| 26 | Jo Ann De Laron | 2 | Daughter | — | Illinois |
| 27 | Frank R. Mccraken | 25 | Head | Credit Clerk | Illinois |
| 28 | Annabelle Mccraken | 24 | Wife | — | Illinois |
| 29 | Patricia A. Mccraken | 2 | Daughter | — | Illinois |
| 30 | Irene Kunkel | 35 | Head | Record Clerk | Illinois |
| 31 | Arlene Kunkel | 8 | Daughter | — | Illinois |
| 33 | Walter Manning | 27 | Head | Steel Inspector | Illinois |
| 34 | Eleanor Manning | 28 | Wife | Beauty-Culturist | Illinois |
| 35 | William R. Mehaffey | 26 | Head | Technical Engineer | Illinois |
| 36 | Elizabeth Mehaffey | 25 | Wife | Stenographer | Illinois |
| 38 | Guido Vigoni | 49 | Head | — | Italy |
| 39 | Maria Vigoni | 42 | Wife | — | Italy |
| 40 | Dino Vigoni | 23 | Son | Janitor | Italy |
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)