JC
John Conroy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Conroy across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1922), then head of a 7-person household.
Age 18
b. ~1922
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Conroy |
| 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 | Machinist |
| Industry | Box Co. |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 326 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Machinist |
| 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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Lawrence Conroy | Son | — | 11 | ~1929 |
| Ann Conroy | Daughter | — | 22 | ~1918 |
| Margaret Conroy | Spouse | — | 52 | ~1888 |
| John Conroy | Son | — | 18 | ~1922 |
| Joseph Conroy | Son | — | 24 | ~1916 |
| Martin Conroy | Son | — | 20 | ~1920 |
| Martin Conroy | Head | — | 54 | ~1886 |
Census Appearances
1930
Cook, Illinois
Son, age 9
Cook, Illinois · implied b. ~1921 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Conroy |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 18
Cook-County, Illinois · implied b. ~1922 — 7 household members
| Surname | Conroy |
| 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 | Machinist |
| Industry | Box Co. |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 326 |
| 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 Conroy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Conroy
Son · 1940 · age 18 · b. ~1922 · Illinois
★ You are viewing this record
Sibling
Martin Conroy
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ann Conroy
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Conroy
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Conroy
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-t0627-01008-00516)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mike Lucas | 45 | Lodger | Cook | Austria |
| 2 | Mike Barbario | 45 | Lodger | Dish Washer | Russia |
| 3 | Robert Zepernick | 76 | Head | — | Germany |
| 4 | Martha Zepernick | 68 | Wife | — | Germany |
| 5 | June Zepernick | 15 | Granddau | — | Illinois |
| 6 | Adolf Zepernick | 45 | Son | Inspector | Illinois |
| 7 | Hugo Dietzel | 43 | Lodger | Labor | Illinois |
| 8 | Fred Johns | 40 | Lodger | Labor | Illinois |
| 9 | John Heissman|Heissmann | 62 | Head | — | Illinois |
| 10 | Louis Heissman|Heissmann | 60 | Wife | — | Illinois |
| 11 | Franklin Heissman|Heissmann | 29 | Son | Dolly Grinder | Illinois |
| 12 | Charles Heissman|Heissmann | 22 | Son | New Worker | Illinois |
| 13 | Sara Moran | 46 | Head | — | Ireland |
| 14 | Rita Mary Moran | 18 | Daughter | Mail Clerk | Illinois |
| 15 | Marguerite Sara Moran | 16 | Daughter | — | Illinois |
| 16 | Harry Storm | 41 | Lodger | — | Illinois |
| 17 | Mary Storm | 40 | Lodger | Maid | Illinois |
| 18 | Frank Droltz | 48 | Head | Furniture Finisher | Yugoslavia |
| 19 | Jenny Droltz | 51 | Wife | — | Yugoslavia |
| 20 | Emily Droltz | 32 | Daughter | Cigarette Girl | Montana |
| 21 | John Droltz | 28 | Son | Furniture Finisher | Montana |
| 22 | Frances Droltz | 18 | Daughter | Saleswoman | Kansas |
| 23 | Frank Droltz | 13 | Son | — | Kansas |
| 24 | Martin Conroy | 54 | Head | Janitor | Ireland |
| 25 | Margaret Conroy | 52 | Wife | — | Ireland |
| 26 | Joseph Conroy | 24 | Son | Janitor | Illinois |
| 27 | Ann Conroy | 22 | Daughter | Clerk | Illinois |
| 28 | Martin Jr. Conroy | 20 | Son | Shipping Clerk | Illinois |
| 29 | John Conroy THIS PERSON | 18 | Son | Machinist | Illinois |
| 30 | Lawrence Conroy | 11 | Son | — | Illinois |
| 31 | Samuel M. Brown | 69 | Head | Elevator Operator | Kentucky |
| 32 | Laura A. Brown | 62 | Wife | — | Illinois |
| 33 | Isadore Lieberman | 51 | Head | Tailor | Russia |
| 34 | Minnie Lieberman | 49 | Wife | — | Russia |
| 35 | Sally Lieberman | 24 | Daughter | Clerk | Illinois |
| 36 | Jennie Lieberman | 21 | Daughter | Saleswoman | Illinois |
| 37 | Ismar Lieberman | 14 | Son | — | Illinois |
| 38 | Hugh O'Connor | 27 | Head | New Worker | Illinois |
| 39 | Irene O'Connor | 28 | Wife | Telephone Operator | Illinois |
| 40 | Katherine O'Connor | 1 | 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)