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John Mcmillan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Mcmillan 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 | McMillan |
| Given Name | John |
| 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 | |
| Occupation | New worker |
| Hours Worked | 14 |
| Income (1939) | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | New Worker |
| 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 John | Age | Birth yr |
|---|---|---|---|---|
| John Mcmillan | Son | — | 17 | ~1923 |
| Frances Mcmillan | Daughter | — | 14 | ~1926 |
| Patricia Mcmillan | Daughter | — | 10 | ~1930 |
| James Mcmillan | Son | — | 20 | ~1920 |
| Elizabeth Mcmillan | Daughter | — | 20 | ~1920 |
| Margaret Mcmillan | Head | — | 48 | ~1892 |
| Isabel Mcmillan | Daughter | — | 19 | ~1921 |
| Margaret Mcmillan | Daughter | — | 12 | ~1928 |
Census Appearances
1930
Cook, Illinois
Son, age 7
Cook, Illinois · implied b. ~1923 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMillin |
| Given Name | John M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Texas |
| Mother's Birthplace | Illinois |
| 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 | McMillan |
| Given Name | John |
| 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 |
| Occupation | New worker |
| Hours Worked | 14 |
| Income (1939) | 0 |
| Highest Grade | Hs 2 |
| 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 Mcmillan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mcmillan
Son · 1940 · age 17 · b. ~1923 · Illinois
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Sibling
Elizabeth Mcmillan
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Isabel Mcmillan
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Mcmillan
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mcmillan
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Mcmillan
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mcmillan
Sibling · 1940 · age 20
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-t0627-01008-00651)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lucy Schio | 67 | Wife | — | Italy |
| 2 | Frank Zeitner | 41 | Head | Janitor | Australia |
| 3 | Anna Zeitner | 38 | Wife | — | Austria |
| 4 | Frank Zeitner | 18 | Son | New Worker | Illinois |
| 5 | Anna Zeitner | 16 | Daughter | — | Illinois |
| 6 | Bert Zeitner | 14 | Son | — | Illinois |
| 7 | Charles Zeitner | 12 | Son | — | Illinois |
| 8 | Rosemary Zeitner | 8 | Daughter | — | Illinois |
| 9 | Betty Zeitner | 5 | Daughter | — | Illinois |
| 10 | John Zeitner | 2 | Son | — | Illinois |
| 11 | Henry Desiron | 59 | Head | Laborer | Illinois |
| 12 | Stella Desiron | 55 | Wife | — | Illinois |
| 13 | Teresa Desiron | 31 | Daughter | Telephone Operator | Illinois |
| 14 | Tony Guagliardi | 34 | Head | Vender | Illinois |
| 15 | Beatrice Guagliardi | 34 | Wife | — | Illinois |
| 16 | Samuel Guagliardi | 3 | Son | — | Illinois |
| 17 | Marie Guagliardi | 1 | Daughter | — | Illinois |
| 18 | Emanuel Guagliardi | 27 | Head | Receiver | Italy |
| 19 | Ignatius Guagliardi | 21 | Wife | — | Illinois |
| 20 | Salvatore Guagliardi | 0 | Son | — | Illinois |
| 21 | Angeline Grana | 44 | Head | Packer | Italy |
| 22 | Sam Grana | 23 | Son | Bus Boy | Illinois |
| 23 | Charles Grana | 20 | Son | Bus Boy | Illinois |
| 24 | Audrey Grana | 19 | Daughter | — | Illinois |
| 25 | Salvatore Guagliardi | 66 | Head | — | Italy |
| 26 | Jennie Guagliardi | 58 | Wife | — | Italy |
| 27 | Christine Guagliardi | 22 | Daughter | Helper | Illinois |
| 28 | Sam Guagliardi | 17 | Son | New Worker | Illinois |
| 29 | Margaret Mcmillan | 48 | Head | — | Ireland |
| 30 | James R. Mcmillan | 20 | Son | Shipping Clerk | Illinois |
| 31 | Elizabeth A. Mcmillan | 20 | Daughter | Finisher | Illinois |
| 32 | Isabel Mcmillan | 19 | Daughter | Helper | Illinois |
| 33 | John Mcmillan THIS PERSON | 17 | Son | New Worker | Illinois |
| 34 | Frances Mcmillan | 14 | Daughter | — | Illinois |
| 35 | Margaret Mcmillan | 12 | Daughter | — | Illinois |
| 36 | Patricia Mcmillan | 10 | Daughter | — | Illinois |
| 37 | Reuben Strom | 43 | Head | Laborer | Illinois |
| 38 | Madeline Strom | 34 | Wife | — | Illinois |
| 39 | Jack Strom | 17 | Son | New Worker | Illinois |
| 40 | Fred Strom | 14 | Son | — | 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)