JG
John Griffin — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Griffin across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Joseph & Alice — first a son (b.~1911), then head of a 8-person household.
Age 29
b. ~1911
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Griffin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Manager |
| Industry | Meat Market |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1560 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Manager |
| Township / Ward | Chicago |
| 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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Mary Griffin | Daughter | — | 20 | ~1920 |
| Geraldine Griffin | Daughter | — | 14 | ~1926 |
| Katherine Griffin | Daughter | — | 25 | ~1915 |
| Sylvia Griffin | Daughter | — | 28 | ~1912 |
| Marceline Griffin | Daughter | — | 24 | ~1916 |
| Margaret Griffin | Daughter | — | 16 | ~1924 |
| Mrs Griffin | Head | — | 56 | ~1884 |
| John Griffin | Son | — | 29 | ~1911 |
Census Appearances
1920
Cook, Illinois
Son, age 8
Cook, Illinois · implied b. ~1912
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Griffin |
| 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 | Germany |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 18
Cook, Illinois · implied b. ~1912 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffin |
| 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 | Germany |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 29
Cook-County, Illinois · implied b. ~1911 — 8 household members
| Surname | Griffin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Manager |
| Industry | Meat Market |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1560 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| 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 Griffin across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Joseph Griffin (~0.92 confidence) and mother Alice Griffin (~0.92 confidence) and mother Mrs Griffin (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Joseph Griffin
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Alice Griffin
b. ~1882
Source mother
● Household
· direct · ~0.92
Mother
Mrs Griffin
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Griffin
Son · 1940 · age 29 · b. ~1911 · Illinois
★ You are viewing this record
Sibling
Geraldine Griffin
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marceline Griffin
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Griffin
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Katherine Griffin
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Griffin
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sylvia Griffin
Sibling · 1940 · age 28
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-t0627-00982-00017)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Joseph Murphy | 49 | Lodger | Mechanic | Ireland |
| 42 | John J Keefe | 77 | Head | — | Illinois |
| 43 | Bessie T Keefe | 45 | Daughter | Bookkeeper | Illinois |
| 44 | John J Jr Keefe | 34 | Son | Mgr Office | Illinois |
| 45 | Katherine F Keefe | 27 | Daughter | — | Illinois |
| 46 | John J Riordan | 40 | Head | Wholesale Meat | Illinois |
| 47 | Ann F Riordan | 41 | Wife | — | Illinois |
| 48 | Mary A Riordan | 8 | Daughter | — | Illinois |
| 49 | Thomas M Riordan | 7 | Son | — | Illinois |
| 50 | John Hussey | 70 | Head | — | Canada-English |
| 51 | Margaret Hussey | 64 | Wife | — | New York |
| 52 | Eleanor Hussey | 34 | Daughter | Saleslady | Illinois |
| 53 | Alice Hussey | 27 | Daughter | Saleslady | Illinois |
| 54 | Edward Griffin | 34 | Head | Bookkeeper | Eire |
| 55 | Anna Griffin | 32 | Wife | — | Eire |
| 56 | Kathleen Griffin | 7 | Daughter | — | Illinois |
| 57 | Eileen Griffin | 4 | Daughter | — | Illinois |
| 58 | James J Griffin | 0 | Son | — | Illinois |
| 59 | Ronald Griffin | 18 | Son | Clerk | Illinois |
| 60 | Joan Griffin | 11 | Daughter | — | Illinois |
| 61 | John O'Malley | 67 | Head | — | Eire |
| 62 | Alice M O'Malley | 26 | Daughter | — | Illinois |
| 63 | Mrs J Griffin | 56 | Head | — | Wisconsin |
| 64 | John Griffin THIS PERSON | 29 | Son | Manager | Illinois |
| 65 | Sylvia Griffin | 28 | Daughter | Teacher | Wisconsin |
| 66 | Katherine Griffin | 25 | Daughter | Secretary | Wisconsin |
| 67 | Marceline Griffin | 24 | Daughter | — | Wisconsin |
| 68 | Mary K Griffin | 20 | Daughter | Manager | Wisconsin |
| 69 | Margaret Griffin | 16 | Daughter | — | Wisconsin |
| 70 | Geraldine Griffin | 14 | Daughter | — | Wisconsin |
| 71 | James Brennan | 73 | Head | — | Eire |
| 72 | Anna Brennan | 71 | Wife | — | Eire |
| 73 | George E Brennan | 43 | Son | Driver | Missouri |
| 74 | John J Brennan | 41 | Son | Driver | Illinois |
| 75 | Timothy Donovan | 65 | Head | — | New York |
| 76 | Sarah Donovan | 70 | Sister | — | New York |
| 77 | Sarah Carlson | 48 | Cousin | Stitcher | Illinois |
| 78 | William H Kearns | 40 | Head | Bartender | Illinois |
| 79 | Anita Kearns | 31 | Wife | — | Connecticut |
| 80 | Anita M Kearns | 9 | Daughter | — | Illinois |
Pedigree Summary
John + 6 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)