JF
John Flaherty — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Flaherty across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1922), then head of a 8-person household.
Age 18
b. ~1922
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Flaherty |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Errand Boy |
| Industry | Trucking Co |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 96 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Errand Boy |
| Township / Ward | Chicago |
| Est. Birth Year | ~1922 |
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 |
|---|---|---|---|---|
| Stephen Flaherty | Son | — | 24 | ~1916 |
| Edward Flaherty | Son | — | 23 | ~1917 |
| Patricia Flaherty | Daughter | — | 17 | ~1923 |
| Marie Flaherty | Head | — | 48 | ~1892 |
| John Flaherty | Son | — | 18 | ~1922 |
| Margaret Flaherty | Daughter | — | 10 | ~1930 |
| Virginia Flaherty | Daughter | — | 15 | ~1925 |
| Mary Flaherty | Daughter | — | 21 | ~1919 |
Census Appearances
1930
Cook, Illinois
Son, age 7
Cook, Illinois · implied b. ~1923 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Flaherty |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 18
Cook-County, Illinois · implied b. ~1922 — 8 household members
| Surname | Flaherty |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Errand Boy |
| Industry | Trucking Co |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 96 |
| Highest Grade | Hs 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 Flaherty across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Flaherty
Son · 1940 · age 18 · b. ~1922 · Illinois
★ You are viewing this record
Sibling
Edward Flaherty
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stephen Flaherty
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Flaherty
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Flaherty
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Flaherty
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Virginia Flaherty
Sibling · 1940 · age 15
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-t0627-00950-00697)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Charles Murphy | 47 | Head | Stock Handler | Illinois |
| 42 | Mary Murphy | 43 | Wife | — | Illinois |
| 43 | Caroline Murphy | 20 | Daughter | — | Illinois |
| 44 | Sadie Murphy | 13 | Daughter | — | Illinois |
| 45 | Charles Murphy | 10 | Son | — | Illinois |
| 46 | Patricia Murphy | 7 | Daughter | — | Illinois |
| 47 | Richard Murphy | 4 | Son | — | Illinois |
| 48 | Mary Murphy | 2 | Daughter | — | Illinois |
| 49 | Richard White | 59 | Head | — | Illinois |
| 50 | Mary White | 56 | Wife | Supervisor | Illinois |
| 51 | Benjamin Benson | 42 | Head | Police Man | Illinois |
| 52 | Nellie Benson | 42 | Wife | — | Illinois |
| 53 | James Dubrey | 56 | Head | Audit-Clerk | Illinois |
| 54 | Jennie Dubrey | 48 | Wife | Stenographer | Illinois |
| 55 | Joseph Dubrey | 21 | Son | Asst Buyer | Illinois |
| 56 | Joseph Mccormick | 73 | Head | — | New York |
| 57 | Nellie Mccormick | 71 | Wife | — | Illinois |
| 58 | Michael O'Connor | 53 | Head | Freight Handler | Ireland |
| 59 | Anna O'Connor | 50 | Wife | — | Ireland |
| 60 | Francis O'Connor | 22 | Son | — | Illinois |
| 61 | Michael Jr O'Connor | 21 | Son | Laborer | Illinois |
| 62 | Anna M O'Connor | 17 | Daughter | — | Illinois |
| 63 | Patrick Conners | 44 | Head | Chauffer | Illinois |
| 64 | Virginia Conners | 37 | Wife | — | Illinois |
| 65 | Lois Conners | 3 | Daughter | — | Illinois |
| 66 | John Hodges | 73 | Head | Watchman | Illinois |
| 67 | Anna Hodges | 67 | Wife | — | Illinois |
| 68 | Marie Flaherty | 48 | Head | — | Ireland |
| 69 | Stephen Flaherty | 24 | Son | Trucker | Illinois |
| 70 | Edward Flaherty | 23 | Son | Trucker | Illinois |
| 71 | Mary Flaherty | 21 | Daughter | Inspector | Illinois |
| 72 | John Flaherty THIS PERSON | 18 | Son | Errand Boy | Illinois |
| 73 | Patricia Flaherty | 17 | Daughter | — | Illinois |
| 74 | Virginia Flaherty | 15 | Daughter | — | Illinois |
| 75 | Margaret Flaherty | 10 | Daughter | — | Illinois |
| 76 | Ray Ozony | 25 | Head | Tool & Dye Maker | Illinois |
| 77 | Gertrude Ozony | 24 | Wife | — | Illinois |
| 78 | Judy Lee Ozony | 2 | Daughter | — | Illinois |
| 79 | Peter Kayden | 57 | Head | Pipe Fitter | Illinois |
| 80 | Sadie Kayden | 50 | 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)