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 head (b.~1885), then head of a 8-person household.
Age 55
b. ~1885
Male
Head
Born: Irish Free State
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Conroy |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Irish Free State |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Stationary fireman |
| Industry | Steam railroad |
| Class of Worker | PW |
| Hours Worked | 56 |
| Income (1939) | 442 |
| Highest Grade | 8 |
| 1935 Residence | Same house |
| Birthplace (normalized) | irish free state |
| Occupation | Stationary Fireman |
| Township / Ward | Chicago |
| Est. Birth Year | ~1885 |
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 |
|---|---|---|---|---|
| John Conroy | Head | — | 55 | ~1885 |
| Katherine Conroy | Daughter | — | 16 | ~1924 |
| Josephine Conroy | Daughter | — | 23 | ~1917 |
| Martin Conroy | Son | — | 21 | ~1919 |
| John Conroy | Son | — | 30 | ~1910 |
| Rose Conroy | Spouse | — | 53 | ~1887 |
| William Conroy | Son | — | 18 | ~1922 |
| Margaret Conroy | Daughter | — | 15 | ~1925 |
Census Appearances
1930
Cook, Illinois
Head, age 45
Cook, Illinois · implied b. ~1885 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Conroy |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Irish Free State |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | No |
| Home Value / Rent | R |
| Radio Set | 35 |
| Birthplace (normalized) | irish free state |
1940
Cook-County, Illinois
Head, age 55
Cook-County, Illinois · implied b. ~1885 — 8 household members
| Surname | Conroy |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Irish Free State |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Occupation | Stationary fireman |
| Industry | Steam railroad |
| Class of Worker | PW |
| Hours Worked | 56 |
| Income (1939) | 442 |
| Highest Grade | 8 |
| 1935 Residence | Same house |
| Birthplace (normalized) | irish free state |
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.
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This person
Anchor record
John Conroy
Head · 1940 · age 55 · b. ~1885 · Illinois
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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-t0627-00957-00666)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Eleanore Hitzker | 23 | Wife | Saleslady | Illinois |
| 42 | Patricia Ann Hitzker | 1 | Daughter | — | Illinois |
| 43 | Joan Calhoon | 32 | Head | Clergyman | New York |
| 44 | Greta Calhoon | 30 | Wife | — | Illinois |
| 45 | Roger Calhoon | 5 | Son | — | Illinois |
| 46 | James Dampier | 45 | Head | Conductor | Illinois |
| 47 | Rose Dampier | 44 | Wife | — | Illinois |
| 48 | June Dampier | 21 | Daughter | Statement Clerk | Illinois |
| 49 | Patrick Clifford | 53 | Head | Stationary Engineer | Irish Free State |
| 50 | Mary Clifford | 43 | Wife | — | Irish Free State |
| 51 | James Clifford | 15 | Son | — | Illinois |
| 52 | Theresa Clifford | 11 | Daughter | — | Illinois |
| 53 | Leo Mautner | 43 | Head | Electric Appliance Salesman | Austria |
| 54 | Helen Mautner | 38 | Wife | — | Belgium |
| 55 | Norman Mautner | 20 | Son | Delivery Boy | Illinois |
| 56 | Frieda Mautner | 0 | Daughter | — | Illinois |
| 57 | Charles Mildner | 43 | Head | Printer-Compositor | Illinois |
| 58 | Alma Mildner | 40 | Wife | — | Wisconsin |
| 59 | Lorraine Mildner | 14 | Daughter | — | Illinois |
| 60 | Beverly Mildner | 10 | Daughter | — | Illinois |
| 61 | Charles Mildner | 5 | Son | — | Illinois |
| 62 | Peter Matthews | 48 | Head | Patrolman | Irish Free State |
| 63 | Bridget Matthews | 48 | Wife | — | Irish Free State |
| 64 | Rose Matthews | 17 | Daughter | — | Illinois |
| 65 | Peter Matthews | 16 | Son | — | Illinois |
| 66 | Thomas Matthews | 14 | Son | — | Illinois |
| 67 | John Conroy THIS PERSON | 55 | Head | Stationary Fireman | Irish Free State |
| 68 | Rose Conroy | 53 | Wife | — | Irish Free State |
| 69 | John Jr. Conroy | 30 | Son | Collector | Illinois |
| 70 | Josephine Conroy | 23 | Daughter | Film Cutter | Illinois |
| 71 | Martin Conroy | 21 | Son | Cost Clerk | Illinois |
| 72 | William Conroy | 18 | Son | — | Illinois |
| 73 | Katherine Conroy | 16 | Daughter | — | Illinois |
| 74 | Margaret Conroy | 15 | Daughter | — | Illinois |
| 75 | Hans Jacobsen | 37 | Head | Fireman | Denmark |
| 76 | Mary Jacobsen | 35 | Wife | — | Illinois |
| 77 | Mary Jacobsen | 12 | Daughter | — | Illinois |
| 78 | Florence Jacobsen | 10 | Daughter | — | Illinois |
| 79 | Joan Jacobsen | 9 | Daughter | — | Illinois |
| 80 | William Jacobsen | 2 | Son | — | 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)