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John Mccormick — 1940 US Census Record
Model Tree available1940 United States Federal Census · Delaware-County, Pennsylvania
Our Model Tree links this John Mccormick across the 1920, 1930 and 1940 US Censuses in Delaware-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents John & Florence — first a son (b.~1911), then head of a 4-person household.
Age 29
b. ~1911
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Delaware-County, Pennsylvania |
| Surname | McCormick |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Chester city |
| 1935 Residence (County) | Delaware |
| Additional Details | |
| Occupation | Laborer |
| Industry | G. Chemical |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 888 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Laborer |
| Township / Ward | Chester City |
| Est. Birth Year | ~1911 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Esther Mccormick | Daughter | — | 34 | ~1906 |
| Florence Mccormick | Head | — | 65 | ~1875 |
| William Mccormick | Son | — | 16 | ~1924 |
| John Mccormick | Son | — | 29 | ~1911 |
Census Appearances
1920
Delaware, Pennsylvania
Son, age 12
Delaware, Pennsylvania · implied b. ~1908 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Pennsylvania |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Delaware, Pennsylvania
Son, age 21
Delaware, Pennsylvania · implied b. ~1909 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Pennsylvania |
| Occupation | Clerk |
| Industry | Post Office |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Delaware-County, Pennsylvania
Son, age 29
Delaware-County, Pennsylvania · implied b. ~1911 — 4 household members
| Surname | McCormick |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Chester city |
| 1935 Residence (County) | Delaware |
| Occupation | Laborer |
| Industry | G. Chemical |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 888 |
| Highest Grade | H 4 |
| 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 Mccormick across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Mccormick (~0.92 confidence) and mother Florence Mccormick (~0.92 confidence) and mother Mary Mccormick (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Mccormick
b. ~1872
Source father
● Household
· direct · ~0.92
Mother
Florence Mccormick
b. ~1875
Source mother
● Household
· direct · ~0.92
Mother
Mary Mccormick
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mccormick
Son · 1940 · age 29 · b. ~1911 · Pennsylvania
★ You are viewing this record
Sibling
Esther Mccormick
Sibling · 1940 · age 34
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mccormick
Sibling · 1940 · age 16
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 — Delaware-County, Pennsylvania
Open full size
1940 US Federal Census — Delaware-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03489-00059)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Michael Garrity | 42 | Head | Painter | England |
| 2 | Mary Garrity | 42 | Wife | Bag Puller | Pennsylvania |
| 3 | Joseph Garrity | 22 | Son | Laborer | Pennsylvania |
| 4 | Mary Garrity | 19 | Daughter | — | Pennsylvania |
| 5 | Sarah Garrity | 16 | Daughter | — | Pennsylvania |
| 6 | George Robeson | 65 | Head | Ticket Agent | Pennsylvania |
| 7 | Agnes Robeson | 34 | Wife | — | Delaware |
| 8 | Edwina Robeson | 4 | Daughter | — | Pennsylvania |
| 9 | Gerald Robeson | 1 | Son | — | Pennsylvania |
| 10 | Meyer Sugerman | 52 | Head | Realtor | Russia |
| 11 | Sophie Sugerman | 50 | Wife | — | Russia |
| 12 | Ester Sugerman | 24 | Daughter | — | Pennsylvania |
| 13 | Gertrude Sugerman | 20 | Daughter | — | Pennsylvania |
| 14 | Bernard Sugerman | 13 | Son | — | Pennsylvania |
| 15 | Florence Mccormick | 65 | Head | — | England |
| 16 | Esther Mccormick | 34 | Daughter | File Clerk | Pennsylvania |
| 17 | John Mccormick THIS PERSON | 29 | Son | Laborer | Pennsylvania |
| 18 | William Mccormick | 16 | Son | — | New York |
| 19 | Thomas Doyle | 49 | Head | Laborer | Pennsylvania |
| 20 | Katherine Doyle | 50 | Wife | — | Pennsylvania |
| 21 | Katherine Moran | 28 | Daughter | — | Pennsylvania |
| 22 | Andrew Moran | 27 | Son-in-law | Pipe Fitter | Maryland |
| 23 | Thomas Moran | 1 | Son | — | Pennsylvania |
| 24 | Charles Conley | 23 | Nephew | Laborer | Pennsylvania |
| 25 | Agnes O'Malley | 45 | Head | — | Ireland |
| 26 | John O'Malley | 21 | Son | Tool Checker | New York |
| 27 | Alrene O'Malley | 15 | Daughter | — | New York |
| 28 | Shirley O'Malley | 10 | Daughter | — | Pennsylvania |
| 29 | Eugene O'Malley | 7 | Son | — | Pennsylvania |
| 30 | Marie White | 23 | Daughter | — | New York |
| 31 | Arthur White | 21 | Son-in-law | Cushion Dept | Pennsylvania |
| 32 | William E. Smith | 46 | Head | Physician | Florida |
| 33 | Bessie Smith | 40 | Wife | — | Georgia |
| 34 | Thomas Duke | 29 | Head | Laborer | Pennsylvania |
| 35 | Sarah Duke | 60 | Mother | Maid | Virginia |
| 36 | Mary Duke | 24 | Sister | Maid | Pennsylvania |
| 37 | Charles Sales | 69 | Uncle | — | Virginia |
| 38 | Slim Lawrence | 30 | Roomer | Laborer | Pennsylvania |
| 39 | Eva G. Smith | 41 | Head | Teacher | Pennsylvania |
| 40 | Novella Flamer | 39 | Sister | Teacher | Pennsylvania |
Pedigree Summary
John + 2 siblings
Gen 1 · 3 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)