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John Mccormick — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Mccormick across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents John & Margaret — first a son (b.~1912), then head of a 5-person household.
Age 28
b. ~1912
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | McCormick |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Park Ridge City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Delivery Work |
| Industry | Wholesale Grocery |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 432 |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Delivery Work |
| Township / Ward | Park Ridge City |
| Est. Birth Year | ~1912 |
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 |
|---|---|---|---|---|
| Elizabeth Mueller | Daughter | — | 24 | ~1916 |
| Margaret Mccormick | Head | — | 58 | ~1882 |
| Francis Mueller | Other | — | 2 | ~1938 |
| John Mccormick | Son | — | 28 | ~1912 |
| Paul Mccormick | Son | — | 26 | ~1914 |
Census Appearances
1920
Cook, Illinois
Son, age 8
Cook, Illinois · implied b. ~1912 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 18
Cook, Illinois · implied b. ~1912 — 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 | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 28
Cook-County, Illinois · implied b. ~1912 — 5 household members
| Surname | McCormick |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Park Ridge City |
| 1935 Residence (County) | Cook |
| Occupation | Delivery Work |
| Industry | Wholesale Grocery |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 432 |
| Highest Grade | H 4 |
| 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 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 Margaret Mccormick (~0.92 confidence) and mother Alice Mccormick (~0.92 confidence) and mother Margaret Mccormick (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Mccormick
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Margaret Mccormick
b. ~1882
Source mother
● Household
· direct · ~0.92
Mother
Alice Mccormick
b. ~1887
Source mother
● Household
· direct · ~0.92
Mother
Margaret Mccormick
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mccormick
Son · 1940 · age 28 · b. ~1912 · Illinois
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Sibling
Paul Mccormick
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Mueller
Sibling · 1940 · age 24
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-t0627-00780-00304)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marguerite M. Grace | 36 | Head | — | Illinois |
| 2 | Joan M. Grace | 13 | Daughter | — | Illinois |
| 3 | P. Douglas Grace | 10 | Son | — | Illinois |
| 4 | Mary A. Grace | 60 | Aunt | — | Illinois |
| 5 | Lloyd M. Berg | 27 | Head | Barber | Wisconsin |
| 6 | Iris L. Berg | 21 | Wife | Stenographer | Illinois |
| 7 | June D. Rold | 33 | Head | Dancing Teacher | New York |
| 8 | Douglas Rold | 13 | Son | — | Illinois |
| 9 | Ronald Rold | 8 | Son | — | Illinois |
| 10 | Virginia J. Burrows | 32 | Partner | File Clerk | Illinois |
| 11 | George Burrows | 12 | Partner's Son | — | Illinois |
| 12 | John Burrows | 10 | Daughter | — | Illinois |
| 13 | Douglas C. Russell | 31 | Head | Manager | Indiana |
| 14 | Cleo M. Russell | 33 | Wife | Clerk | Indiana |
| 15 | Marvin Russell | 16 | Son | Store Clerk | Indiana |
| 16 | Delmar Russell | 13 | Son | — | Indiana |
| 17 | Elden Russell | 11 | Son | — | Illinois |
| 18 | Daniel Russell | 7 | Son | — | Illinois |
| 19 | Jessie D. Barclay | 76 | Head | — | Kentucky |
| 20 | Mildred Barclay | 26 | Granddaughter | Office Clerk | Kentucky |
| 21 | Alma B. Miller | 58 | Head | Insurance Clerk | Illinois |
| 22 | Barbara Miller | 86 | Mother | — | Illinois |
| 23 | Harry J. Berry | 67 | Head | Painter | Colorado |
| 24 | Rosa M. Berry | 66 | Wife | Practical Nurse | Illinois |
| 25 | Lemoyne M. Heese | 51 | Head | Proprietor | Illinois |
| 26 | Dorothy M. Heese | 47 | Wife | — | Wisconsin |
| 27 | George H. Olmsted | 68 | Head | — | Iowa |
| 28 | Mattie J. Olmsted | 64 | Wife | — | Wisconsin |
| 29 | Margaret R. Mccormick | 58 | Head | Real Estate Agent | Illinois |
| 30 | John S. Mccormick THIS PERSON | 28 | Son | Delivery Work | Illinois |
| 31 | Paul E. Mccormick | 26 | Son | Plant Worker | Illinois |
| 32 | Elizabeth J. Mueller | 24 | Daughter | Operator | Illinois |
| 33 | Francis Mueller | 2 | Grandson | — | Illinois |
| 34 | Benjamin H. Sommers | 38 | Head | Office Manager | Wisconsin |
| 35 | Eleanor L. Sommers | 32 | Wife | — | Illinois |
| 36 | Sylvia L. Sommers | 5 | Daughter | — | Illinois |
| 37 | Christina C. Palm | 65 | Mother | Alteration Work | Germany |
| 38 | William A. Bormann | 48 | Head | Sign Hanger | Illinois |
| 39 | Anna Bormann | 41 | Wife | — | Illinois |
| 40 | Marion S. Bormann | 21 | Daughter | Maid | Illinois |
Pedigree Summary
John + 2 siblings
Gen 1 · 4 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)