JC
John Coffey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Coffey across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1926), then head of a 7-person household.
Age 14
b. ~1926
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Coffey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | CHICAGO CITY |
| 1935 Residence (County) | COOK |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1926 |
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 |
|---|---|---|---|---|
| Daniel Coffey | Son | — | 9 | ~1931 |
| Laurence Coffey | Son | — | 16 | ~1924 |
| Robert Coffey | Son | — | 2 | ~1938 |
| Elaine Coffey | Daughter | — | 6 | ~1934 |
| Eugene Coffey | Head | — | 46 | ~1894 |
| Elnora Coffey | Spouse | — | 42 | ~1898 |
| John Coffey | Son | — | 14 | ~1926 |
Census Appearances
1930
Cook, Illinois
Son, age 3
Cook, Illinois · implied b. ~1927 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Coffey |
| Given Name | John P |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 14
Cook-County, Illinois · implied b. ~1926 — 7 household members
| Surname | Coffey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | CHICAGO CITY |
| 1935 Residence (County) | COOK |
| Class of Worker | 0 |
| Highest Grade | No 6 |
| 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 Coffey across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Coffey
Son · 1940 · age 14 · b. ~1926 · Illinois
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Sibling
Elaine Coffey
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Daniel Coffey
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Coffey
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Laurence Coffey
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 — 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-t0627-00929-00361)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Margaret B. Tucker | 23 | Head | — | Illinois |
| 2 | David Tucker | 2 | Son | — | — |
| 3 | Carl Frey | 43 | Head | Maintenance Plumber | Ohio |
| 4 | Rose Frey | 43 | Wife | — | Pennsylvania |
| 5 | Arthur Frey | 23 | Son | Receiving Clerk | Ohio |
| 6 | Lucille Frey | 17 | Daughter | — | Ohio |
| 7 | Rose Briggs | 54 | Head | Resident Manager | Scotland |
| 8 | Hymen Cohen | 51 | Head | Owner | Russia |
| 9 | Stephine Cohen | 42 | Wife | — | Illinois |
| 10 | Ruth Cohen | 20 | Daughter | Saleslady | Illinois |
| 11 | Sara Mae Cohen | 18 | Daughter | New Worker | Illinois |
| 12 | Edith Cohen | 16 | Daughter | — | Illinois |
| 13 | Barney Davidson | 48 | Head | Laborer | Illinois |
| 14 | Roy Moran | 32 | Head | Chauffeur | Illinois |
| 15 | Laura Flanagan | 40 | Head | Attendant | Illinois |
| 16 | Irene Dough | 37 | Head | Waitress | Illinois |
| 17 | Retta O'Neill | 37 | Head | — | Canada |
| 18 | Mary E. Rolley | 41 | Daughter | Nurse | England |
| 19 | Ralph Maillon | 50 | Head | Maintenance Mechanic | Ohio |
| 20 | Clara Maillon | 54 | Wife | — | Ohio |
| 21 | Myrle Durkin | 39 | Head | Factory Worker | Michigan |
| 22 | Rudolph Fidelity | 63 | Head | Night Clerk | Germany |
| 23 | Pauline Fidelity | 61 | Wife | — | Pennsylvania |
| 24 | Hal Carr | 29 | Head | Bank Clerk | Illinois |
| 25 | Mae Carr | 24 | Wife | — | Illinois |
| 26 | Patricia Carr | 1 | Daughter | — | — |
| 27 | Owen J. Woods | 24 | Head | Linoleum Cutter | Illinois |
| 28 | Ida Woods | 20 | Wife | — | Illinois |
| 29 | Colleen Woods | 3 | Daughter | — | — |
| 30 | Owen Jr. Woods | 2 | Son | — | — |
| 31 | Eugene B. Coffey | 46 | Head | Metal Polisher And Buffer | Illinois |
| 32 | Elnora Coffey | 42 | Wife | — | Illinois |
| 33 | Laurence Coffey | 16 | Son | New Worker | Illinois |
| 34 | John Coffey THIS PERSON | 14 | Son | — | Illinois |
| 35 | Daniel Coffey | 9 | Son | — | Illinois |
| 36 | Elaine Coffey | 6 | Daughter | — | — |
| 37 | Robert Coffey | 2 | Son | — | — |
| 38 | George Abrahams | 57 | Head | Itinerant Peddler | Illinois |
| 39 | Rudolph Biggle | 38 | Head | Rodman | Illinois |
| 40 | Margaret Biggle | 26 | Wife | — | 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)