JM
John Mccormack — 1940 US Census Record
Model Tree available1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this John Mccormack across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents James & John — first a son (b.~1909), then head of a 5-person household.
Age 31
b. ~1909
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | McCormack |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | Clerk |
| Industry | Pittsburgh News |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 840 |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Clerk |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1909 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Frank Madden | Other | — | 22 | ~1918 |
| Rose Mccormack | Spouse | — | 54 | ~1886 |
| John Mccormack | Son | — | 31 | ~1909 |
| Irene Madden | Other | — | 25 | ~1915 |
| John Mccormack | Head | — | 57 | ~1883 |
Census Appearances
1920
Allegheny, Pennsylvania
Son, age 11
Allegheny, Pennsylvania · implied b. ~1909 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | John J. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Ohio |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
Son, age 22
Allegheny, Pennsylvania · implied b. ~1908 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Ohio |
| Occupation | Mechanic |
| Industry | Muscle Steel Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Son, age 31
Allegheny-County, Pennsylvania · implied b. ~1909 — 5 household members
| Surname | McCormack |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Occupation | Clerk |
| Industry | Pittsburgh News |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 840 |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Mccormack across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Mccormick (~0.92 confidence) and father John Mccormack (~0.92 confidence) and father John Mccormick (~0.92 confidence) and mother Martha Mccormick (~0.92 confidence) and mother Rose Mccormack (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Mccormick
b. ~1858
Source father
● Household
· direct · ~0.92
Father
John Mccormack
b. ~1883
Source father
● Household
· direct · ~0.92
Father
John Mccormick
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Martha Mccormick
b. ~1889
Source mother
● Household
· direct · ~0.92
Mother
Rose Mccormack
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mccormack
Son · 1940 · age 31 · b. ~1909 · Pennsylvania
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Allegheny-County, Pennsylvania
Open full size
1940 US Federal Census — Allegheny-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03668-00387)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Leona Calabrese | 6 | Daughter | — | Pennsylvania |
| 42 | John J. Lutsko | 34 | Head | Mechanic | Pennsylvania |
| 43 | Ann Lutsko | 32 | Wife | — | Pennsylvania |
| 44 | John Lutsko | 11 | Son | — | Pennsylvania |
| 45 | William A. Lutsko | 9 | Son | — | Pennsylvania |
| 46 | Joan Lutsko | 7 | Daughter | — | Pennsylvania |
| 47 | Joseph Lutsko | 5 | Son | — | Pennsylvania |
| 48 | Geraldine Lutsko | 3 | Daughter | — | Pennsylvania |
| 49 | Susan Lutsko | 53 | Mother | Maid | Pennsylvania |
| 50 | Clifton O'Brien | 40 | Head | Chauffeur | Pennsylvania |
| 51 | Margaret O'Brien | 39 | Wife | — | Pennsylvania |
| 52 | Isabel O'Brien | 20 | Daughter | Laborer | Pennsylvania |
| 53 | Vincent O'Brien | 18 | Son | Laborer | Pennsylvania |
| 54 | Dorothy O'Brien | 16 | Daughter | — | Pennsylvania |
| 55 | Edith O'Brien | 13 | Daughter | — | Pennsylvania |
| 56 | John O'Brien | 10 | Son | — | Pennsylvania |
| 57 | Alvin M. O'Brien | 8 | Daughter | — | Pennsylvania |
| 58 | Raymond O'Brien | 5 | Son | — | Pennsylvania |
| 59 | Richard O'Brien | 3 | Son | — | Pennsylvania |
| 60 | Joseph Sr. Mcdermott | 43 | Head | Helper | Pennsylvania |
| 61 | Lillian Mcdermott | 38 | Wife | — | Pennsylvania |
| 62 | Vivian Mcdermott | 19 | Daughter | Waitress | Pennsylvania |
| 63 | Margaret Mcdermott | 17 | Daughter | — | Pennsylvania |
| 64 | Joseph Jr. Mcdermott | 14 | Son | — | Pennsylvania |
| 65 | Richard Kindspenner | 42 | Head | Policeman | Ohio |
| 66 | Martha Kindspenner | 41 | Wife | — | Pennsylvania |
| 67 | Frieda Kindspenner | 20 | Daughter | Waitress | Pennsylvania |
| 68 | Richard John Kindspenner | 15 | Son | — | Pennsylvania |
| 69 | Rose M. Kindspenner | 6 | Daughter | — | Pennsylvania |
| 70 | John Mccormack | 57 | Head | Carpenter | Pennsylvania |
| 71 | Rose Mccormack | 54 | Wife | — | Pennsylvania |
| 72 | John Jr. Mccormack THIS PERSON | 31 | Son | Clerk | Pennsylvania |
| 73 | Frank L. Madden | 22 | Lodger | Stenographer | Pennsylvania |
| 74 | Irene E. Madden | 25 | Lodger | Stenographer | Indiana |
| 75 | Patrick Hanlon | 61 | Head | Steerman | Pennsylvania |
| 76 | Delia Hanlon | 58 | Wife | — | Pennsylvania |
| 77 | Joseph Hanlon | 30 | Son | Mail Carrier | Pennsylvania |
| 78 | Mary Hanlon | 23 | Daughter | Operator | Pennsylvania |
| 79 | Jean Hanlon | 21 | Daughter | — | Pennsylvania |
| 80 | Eileen Hanlon | 18 | Daughter | — | Pennsylvania |
Related Census Records
Pedigree Summary
John
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
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)