JG
John Geary — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Geary across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1931), then head of a 7-person household.
Age 9
b. ~1931
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Geary |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Class of Worker | 0 |
| Income (1939) | 0 |
| Highest Grade | 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1931 |
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 |
|---|---|---|---|---|
| Colman Geary | Son | — | 19 | ~1921 |
| William Geary | Son | — | 15 | ~1925 |
| Madeline Geary | Spouse | — | 40 | ~1900 |
| John Geary | Head | — | 47 | ~1893 |
| Madeline Geary | Daughter | — | 10 | ~1930 |
| John Geary | Son | — | 9 | ~1931 |
| Mary Geary | Daughter | — | 13 | ~1927 |
Census Appearances
1930
Cook, Illinois
Son, age
Cook, Illinois · implied b. ~1930 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Gerry |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Mississippi |
| Mother's Birthplace | Wisconsin |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 9
Cook-County, Illinois · implied b. ~1931 — 7 household members
| Surname | Geary |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Class of Worker | 0 |
| Income (1939) | 0 |
| Highest Grade | 2 |
| 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 Geary across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Geary
Son · 1940 · age 9 · b. ~1931 · Illinois
★ You are viewing this record
Sibling
Mary Geary
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Madeline Geary
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Colman Geary
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Geary
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
38 people indexed on this census page (nara:1940:m-t0627-00956-00595)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Cloe B. Crenshaw | 47 | Wife | — | Illinois |
| 42 | Richard Crenshaw | 19 | Son | — | Illinois |
| 43 | Milton P. Jacobs | 70 | Head | — | Illinois |
| 44 | Mayme H. Jacobs | 69 | Wife | Attendant | Pennsylvania |
| 45 | Lucille V. Beach | 42 | Daughter | Saleslady | Illinois |
| 46 | Byron Beach | 18 | Grandson | — | Missouri |
| 47 | Lorne Johnstone | 47 | Head | Librarian | Illinois |
| 48 | William Johnstone | 19 | Son | — | Illinois |
| 49 | Minnie Campbell | 82 | Lodger | — | Ohio |
| 50 | Mary D. Campbell | 53 | Lodger | — | Ohio |
| 51 | Sophie Fleischer | 66 | Head | — | Germany |
| 52 | Gertrude Fleischer | 30 | Daughter | Switch B. Operator | Illinois |
| 53 | Marguerite Wood | 55 | Lodger | Housekeeper | Canada |
| 54 | Marguerite Wood | 22 | Lodger | Insurance Clerk | Illinois |
| 55 | John Geary | 47 | Head | Railroad Man | Illinois |
| 56 | Madeline Geary | 40 | Wife | — | Illinois |
| 57 | Colman Geary | 19 | Son | — | Illinois |
| 58 | William Geary | 15 | Son | — | Illinois |
| 59 | Mary A. Geary | 13 | Daughter | — | Illinois |
| 60 | Madeline Geary | 10 | Daughter | — | Illinois |
| 61 | John Geary THIS PERSON | 9 | Son | — | Illinois |
| 62 | Howard Kingsbury | 54 | Head | Appraiser | S. Dakota |
| 63 | Florence Kingsbury | 55 | Wife | — | Illinois |
| 64 | Barbara Kingsbury | 12 | Daughter | — | Illinois |
| 66 | Ralph B. Breese | 51 | Head | Milkman | Illinois |
| 67 | Cecelia Breese | 48 | Wife | — | Illinois |
| 68 | John R. Breese | 24 | Son | Ins. Broker | Illinois |
| 69 | Betty J. Breese | 16 | Daughter | — | Illinois |
| 70 | Walter W. Barkley | 63 | Head | Doctor | Illinois |
| 71 | Blanche E. Barkley | 59 | Wife | — | Indiana |
| 72 | Ruth N. Barkley | 31 | Daughter | Stenographer | Illinois |
| 73 | Peter Seyl | 51 | Head | Treasurer | Illinois |
| 74 | Signe Seyl | 56 | Wife | — | Sweden |
| 76 | Claude W. Eastman | 60 | Head | Retail Coal Co. | Wisconsin |
| 77 | Bessie W. Eastman | 55 | Wife | — | Illinois |
| 78 | Ralph K. Hoover | 48 | Head | Executive | Kansas |
| 79 | Dorothy Hoover | 42 | Wife | — | Illinois |
| 80 | Joan Hoover | 13 | Daughter | — | 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)