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William Reilly — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this William Reilly across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1926), then head of a 6-person household.
Age 14
b. ~1926
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Reilly |
| Given Name | William Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Industry | 0 |
| Highest Grade | Hs 1 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| 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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Dennis Reilly | Son | — | 12 | ~1928 |
| Mary Reilly | Spouse | — | 47 | ~1893 |
| William Reilly | Head | — | 48 | ~1892 |
| Mary Reilly | Daughter | — | 17 | ~1923 |
| William Reilly | Son | — | 14 | ~1926 |
| Catherine Reilly | Daughter | — | 15 | ~1925 |
Census Appearances
1930
Cook, Illinois
Son, age 4
Cook, Illinois · implied b. ~1926 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Reilly |
| Given Name | William Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Illinois |
| Can Read/Write | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 14
Cook-County, Illinois · implied b. ~1926 — 6 household members
| Surname | Reilly |
| Given Name | William Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Industry | 0 |
| Highest Grade | Hs 1 |
| 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 William Reilly across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Reilly
Son · 1940 · age 14 · b. ~1926 · Illinois
★ You are viewing this record
Sibling
Catherine Reilly
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dennis Reilly
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Reilly
Sibling · 1940 · age 17
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-t0627-00996-00032)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Martin Siddons | 80 | head | Proprietor | Canada English |
| 2 | Mary Siddons | 77 | wife | — | Canada English |
| 3 | Herbert F. Mccuen | 67 | head | Buyer Garment | Canada English |
| 4 | Lulu D. Mccuen | 62 | wife | — | Illinois |
| 5 | Mary Mccuen | 32 | daughter | Secretary | Illinois |
| 6 | Daisy Campbell | 60 | lodger | Engrosser | Illinois |
| 7 | Madge Powers | 65 | lodger | Secretary | Illinois |
| 8 | Maude Wiltsey | 63 | head | — | New Jersey |
| 9 | Mabelle Miller | 58 | sister | Sales Lady | New Jersey |
| 10 | Jennie Malm | 73 | lodger | — | Sweden |
| 11 | Lucille Reimer | 22 | lodger | X-Ray Technician | Minnesota |
| 12 | William J. Walsh | 69 | head | Weighing Deputy | Illinois |
| 13 | Anne C. Walsh | 60 | wife | — | Illinois |
| 14 | William J. Jr. Walsh | 31 | son | Lawyer | Illinois |
| 15 | Robert Gehrke | 41 | head | Stock Clerk | Illinois |
| 16 | Lois Gehrke | 35 | wife | — | Illinois |
| 17 | Imogene Gehrke | 5 | daughter | — | Illinois |
| 18 | Henry F. Gehrke | 73 | head | Insurance Solicitor | Illinois |
| 19 | Ella D. Gehrke | 48 | daughter | — | Illinois |
| 20 | Henry Meegan | 30 | head | Chauffeur | Illinois |
| 21 | Florence Meegan | 28 | wife | — | Illinois |
| 22 | Richard Meegan | 5 | son | — | Illinois |
| 23 | Sharon Meegan | 1 | son | — | Illinois |
| 24 | James Taylor | 53 | lodger | Bartender | Illinois |
| 25 | Florence Taylor | 50 | lodger | — | Illinois |
| 26 | Herbert Mcewen | 34 | lodger | Distributing Agent | Illinois |
| 27 | William M. Reilly | 48 | head | Stationary Engineer | Ohio |
| 28 | Mary Reilly | 47 | wife | — | Illinois |
| 29 | Mary Reilly | 17 | daughter | — | Illinois |
| 30 | Catherine Reilly | 15 | daughter | — | Illinois |
| 31 | William Jr. Reilly THIS PERSON | 14 | son | — | Illinois |
| 32 | Dennis Reilly | 12 | son | — | Illinois |
| 33 | Fredrick Maass | 51 | head | Chief Clerk Adjuster | Illinois |
| 34 | Martha H. Maass | 47 | wife | — | Illinois |
| 35 | Evelyn Maass | 26 | daughter | Stenographer | Illinois |
| 36 | Marshall Maass | 21 | son | New Trader | Illinois |
| 37 | Merle Maass | 21 | son | Gas Station Attendant | Illinois |
| 38 | John Busenbark | 66 | head | Auditor | Iowa |
| 39 | Gretta Busenbark | 65 | wife | — | Ohio |
| 40 | Wilma Busenbark | 31 | daughter | Legal Editor | New Jersey |
Related Census Records
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)