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John Mcmullen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Mcmullen across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 7-person household.
Age 12
b. ~1928
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | McMullen |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | 7 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1928 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Veronica Mcmullen | Daughter | — | 15 | ~1925 |
| Irene Mcmullen | Daughter | — | 17 | ~1923 |
| Catherine Mcmullen | Spouse | — | 50 | ~1890 |
| Catherine Mcmullen | Daughter | — | 19 | ~1921 |
| John Mcmullen | Son | — | 12 | ~1928 |
| Edward Mcmullen | Head | — | 52 | ~1888 |
| James Mcmullen | Other | — | 55 | ~1885 |
Census Appearances
1930
Cook, Illinois
Son, age 3
Cook, Illinois · implied b. ~1927 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMullen |
| Given Name | John A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Northern Ireland |
| Mother's Birthplace | Irish Free State |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 12
Cook-County, Illinois · implied b. ~1928 — 7 household members
| Surname | McMullen |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Highest Grade | 7 |
| 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 Mcmullen across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mcmullen
Son · 1940 · age 12 · b. ~1928 · Illinois
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Sibling
Irene Mcmullen
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Veronica Mcmullen
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Mcmullen
Sibling · 1940 · age 19
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-t0627-00941-00511)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edna Mantai | 17 | Daughter | — | Illinois |
| 2 | Winifred Mantai | 16 | Son | — | Illinois |
| 3 | Robert Mantai | 14 | Son | — | Illinois |
| 4 | Ruth Mantai | 12 | Daughter | — | Illinois |
| 5 | Nick Necimovich | 54 | Head | Laborer | Austria |
| 6 | Eva Necimovich | 52 | Wife | — | Austria |
| 7 | Anna Necimovich | 24 | Daughter | Assembler | Illinois |
| 8 | George Necimovich | 23 | Son | Laborer | Illinois |
| 9 | Catherine Necimovich | 21 | Daughter | Machine Operator | Illinois |
| 10 | Joseph Necimovich | 20 | Son | Punch Press | Illinois |
| 11 | John Necimovich | 17 | Son | — | Illinois |
| 12 | Nicholas Necimovich | 16 | Son | — | Illinois |
| 13 | Michael Necimovich | 14 | Son | — | Illinois |
| 14 | Emil Necimovich | 14 | Son | — | Illinois |
| 15 | Frank Necimovich | 11 | Son | — | Illinois |
| 16 | Frank Koteles | 38 | Head | Chrome Plater | Austria-Hungy |
| 17 | Mary Koteles | 23 | Wife | Packer | Illinois |
| 18 | Frank X Koteles | 1 | Son | — | Illinois |
| 19 | George James | 27 | Brother-in-law | Asst. Engineer | New York |
| 20 | Julia James | 27 | Sister-in-law | — | Illinois |
| 21 | George James | 2 | Nephew | — | Illinois |
| 23 | Edward Mcmullen | 52 | Head | Shearman | Ireland |
| 24 | Catherine Mcmullen | 50 | Wife | — | Ireland |
| 25 | Catherine Mcmullen | 19 | Daughter | — | Illinois |
| 26 | Irene Mcmullen | 17 | Daughter | — | Illinois |
| 27 | Veronica Mcmullen | 15 | Daughter | — | Illinois |
| 28 | John Mcmullen THIS PERSON | 12 | Son | — | Illinois |
| 29 | James Mcmullen | 55 | Uncle | Laborer | Ireland |
| 30 | William Douglas | 44 | Head | Fireman | Illinois |
| 31 | Mabel Douglas | 47 | Wife | — | Indiana |
| 32 | Florence M Douglas | 54 | Sister | — | Indiana |
| 33 | William Nicholson | 71 | Head | Machinist | Illinois |
| 34 | Jessie Nicholson | 41 | Daughter | — | Illinois |
| 35 | Sarah Ladd | 54 | Head | — | Illinois |
| 36 | Ruth Ladd | 11 | Daughter | — | Illinois |
| 37 | Joseph Halm | 36 | Son-in-law | Janitor | Illinois |
| 38 | Margaret Halm | 33 | Daughter | — | Illinois |
| 39 | Margie Halm | 10 | Grand-daughter | — | Illinois |
| 40 | Joan Halm | 6 | Grand-daughter | — | 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)