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James Byrne — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this James Byrne across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1871), then head of a 8-person household.
Age 69
b. ~1871
Male
Head
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Byrne |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 69 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | Chicago |
| Est. Birth Year | ~1871 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| Mary Byrne | Daughter | — | 32 | ~1908 |
| James Byrne | Head | — | 69 | ~1871 |
| Rose Byrne | Daughter | — | 34 | ~1906 |
| John Byrne | Son | — | 42 | ~1898 |
| Thomas Byrne | Son | — | 23 | ~1917 |
| Margaret Byrne | Spouse | — | 63 | ~1877 |
| Katherine Byrne | Daughter | — | 25 | ~1915 |
| Margaret Byrne | Daughter | — | 27 | ~1913 |
Census Appearances
1930
Cook, Illinois
Head, age 60
Cook, Illinois · implied b. ~1870 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Byrne |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Ireland |
| Age at First Marriage | 37 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Watchman |
| Industry | Printing |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 25 |
| Radio Set | R |
| Veteran | Yes |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Cook-County, Illinois
Head, age 69
Cook-County, Illinois · implied b. ~1871 — 8 household members
| Surname | Byrne |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 69 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Class of Worker | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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 James Byrne across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
James Byrne
Head · 1940 · age 69 · b. ~1871 · 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-t0627-00959-00255)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Flanagan | 46 | Wife | — | Illinois |
| 2 | Mary Flanagan | 14 | daughter | — | Illinois |
| 3 | Julia Flanagan | 12 | daughter | — | Illinois |
| 4 | Harlan S. Sorensen | 35 | Head | Broker | Illinois |
| 5 | Eleanor Sorensen | 30 | Wife | Music Teacher | Illinois |
| 6 | Emma Sorensen | 73 | Mother | — | Germany |
| 7 | Wilfred Bray | 37 | Head | Salesman | Michigan |
| 8 | Myrtle Bray | 33 | Wife | — | Wisconsin |
| 9 | Barbara Bray | 12 | daughter | — | Illinois |
| 10 | William Bray | 11 | son | — | Illinois |
| 11 | Patricia Bray | 9 | daughter | — | Illinois |
| 12 | Susan Bray | 4 | daughter | — | Illinois |
| 13 | James Byrne THIS PERSON | 69 | Head | — | Ireland |
| 14 | Margaret Byrne | 63 | Wife | — | Ireland |
| 15 | John J. Byrne | 42 | Son | Truck Driver | Illinois |
| 16 | Rose M. Byrne | 34 | Daughter | Bookkeeper | Illinois |
| 17 | Mary J. Byrne | 32 | Daughter | Pvt. Secretary | Illinois |
| 18 | Margaret V. Byrne | 27 | Daughter | Stenographer | Illinois |
| 19 | Katherine M. Byrne | 25 | Daughter | Stenographer | Illinois |
| 20 | Thomas J. Byrne | 23 | Son | Window Washer | Illinois |
| 21 | John J. Blaine | 55 | Head | — | Ireland |
| 22 | Helen Blaine | 55 | Wife | — | Ireland |
| 23 | Mona Blaine | 16 | Daughter | — | Illinois |
| 24 | Thomas J. Regan | 59 | Head | Water-Man | Ireland |
| 25 | Margaret Regan | 54 | Wife | — | Ireland |
| 26 | Thomas Jr. Regan | 23 | son | Clerical | Illinois |
| 27 | Mary Regan | 19 | daughter | Clerical Work | Illinois |
| 28 | William Regan | 18 | son | — | Illinois |
| 29 | Michael T. Naylon | 57 | Head | Fireman | Ireland |
| 30 | Nellie Naylon | 52 | Wife | Clerk (Sales) | Ireland |
| 31 | Nellie Naylon | 22 | daughter | Typist | Indiana |
| 32 | Rita May Naylon | 14 | daughter | — | Indiana |
| 33 | Jack Naylon | 18 | son | — | Indiana |
| 34 | George W. Ernest | 43 | Head | Maintenance Mechanic | Illinois |
| 35 | Estelle L. Ernest | 36 | Wife | Bookkeeper | Illinois |
| 36 | Left Line | None | by | — | — |
| 37 | Axel N. Skog | 49 | Head | Painter And Decorator | Sweden |
| 38 | Etta Skog | 47 | Wife | — | Sweden |
| 39 | Charles A. Feeney | 47 | Head | Asst Clerk To Chief Engineer | Illinois |
| 40 | Rose A. Feeney | 43 | Wife | — | Indiana |
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)