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Mary Byrne — 1940 US Census Record
Model Tree available1940 United States Federal Census · Winnebago-County, Illinois
Our Model Tree links this Mary Byrne across the 1920, 1930 and 1940 US Censuses in Winnebago-County, Illinois (XGBoost, ~Confirmed), with identified parents Leo & Helen — first a daughter (b.~1914), then head of a 8-person household.
Age 26
b. ~1914
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Winnebago-County, Illinois |
| Surname | Byrne |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Burritt Twp |
| 1935 Residence (County) | Winnebago |
| Additional Details | |
| Occupation | Stenographer |
| Industry | Doctor office |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 706 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Stenographer |
| Township / Ward | Burritt Twp |
| Est. Birth Year | ~1914 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Byrne | Daughter | — | 26 | ~1914 |
| Catherine Byrne | Daughter | — | 19 | ~1921 |
| Anne Byrne | Daughter | — | 15 | ~1925 |
| Leo Byrne | Head | — | 52 | ~1888 |
| Robert Peterson | Other | — | 19 | ~1921 |
| Alice Brockman | Other | — | 84 | ~1856 |
| Leo Byrne | Son | — | 16 | ~1924 |
| Nell Byrne | Spouse | — | 48 | ~1892 |
Census Appearances
1920
Winnebago, Illinois
Daughter, age 6
Winnebago, Illinois · implied b. ~1914 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Byrne |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Winnebago, Illinois
Daughter, age 16
Winnebago, Illinois · implied b. ~1914 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Byrne |
| Given Name | Mary B. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Winnebago-County, Illinois
Daughter, age 26
Winnebago-County, Illinois · implied b. ~1914 — 8 household members
| Surname | Byrne |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Burritt Twp |
| 1935 Residence (County) | Winnebago |
| Occupation | Stenographer |
| Industry | Doctor office |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 706 |
| Highest Grade | H-4 |
| 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 Mary Byrne across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Leo Byrne (~0.92 confidence) and mother Helen Byrne (~0.92 confidence) and mother Nell Byrne (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Leo Byrne
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Helen Byrne
b. ~1892
Source mother
● Household
· direct · ~0.92
Mother
Nell Byrne
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Byrne
Daughter · 1940 · age 26 · b. ~1914 · Illinois
★ You are viewing this record
Sibling
Catherine Byrne
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leo Byrne
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anne Byrne
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 — Winnebago-County, Illinois
Open full size
1940 US Federal Census — Winnebago-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00912-00006)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mort E. Anderson | 57 | Head | Farmer | Illinois |
| 2 | Isabelle Anderson | 56 | Wife | — | Illinois |
| 3 | Morris Anderson | 14 | Son | Student | Illinois |
| 4 | George H. Halley | 54 | Head | Farmer | Illinois |
| 5 | Mary Halley | 52 | Wife | — | Iowa |
| 6 | Myrtle Halley | 26 | Daughter | Housework | Illinois |
| 7 | Warren Halley | 21 | Son | Farmer | Illinois |
| 8 | Robert Mcmillage | 53 | Head | Farmer | Illinois |
| 9 | Helen Mcmillage | 45 | Wife | — | Illinois |
| 10 | Jean Mcmillage | 10 | Daughter | Stenographer | Illinois |
| 11 | Leo Byrne | 52 | Head | Farmer | Illinois |
| 12 | Nell Byrne | 48 | Wife | Stenographer | Illinois |
| 13 | Mary Byrne THIS PERSON | 26 | Daughter | Stenographer | Illinois |
| 14 | Catherine Byrne | 19 | Daughter | Student | Illinois |
| 15 | Leo Byrne | 16 | Son | Student | Illinois |
| 16 | Anne Byrne | 15 | Daughter | — | Illinois |
| 17 | Alice Brockman | 84 | Mother-in-law | — | Ireland |
| 18 | Robert Peterson | 19 | Hired Hand | Farmer | Wisconsin |
| 19 | Cornell Gale | 51 | Head | Farmer | Illinois |
| 20 | Vera Gale | 50 | Wife | — | Illinois |
| 21 | Elnore Gale | 20 | Daughter | — | Illinois |
| 22 | Roe Gale | 14 | Daughter | Student | Illinois |
| 23 | Nels Olsen | 58 | Head | Farmer | Iowa |
| 24 | Mary Olsen | 57 | Wife | — | Sweden |
| 25 | Alice Olsen | 16 | Daughter | Student | Nebraska |
| 26 | Arthur Comelin | 20 | Hired Hand | Farmer | Iowa |
| 27 | Andrew Larson | 75 | Head | Retired Farmer | Sweden |
| 28 | Axel Larson | 45 | Son | Farmer | Illinois |
| 29 | Clinton Larson | 44 | Son | Farmer | Illinois |
| 30 | John Landolt | 44 | Head | Farmer | Illinois |
| 31 | Ella Landolt | 39 | Wife | — | Illinois |
| 32 | Herschel Landolt | 15 | Son | Student | Illinois |
| 33 | Geraldine Landolt | 11 | Daughter | — | Illinois |
| 34 | Steve Julian | 50 | Head | Farmer | Illinois |
| 35 | Nellie Julian | 50 | Wife | — | Iowa |
| 36 | Wayne Julian | 20 | Son | Clothing Salesman | Illinois |
| 37 | Richard Julian | 23 | Son | Farmer | Illinois |
| 38 | Hazel Julian | 24 | Daughter | Bookkeeper | Illinois |
| 39 | Joe Doyle | 49 | Head | Farmer | Illinois |
| 40 | Esther Doyle | 44 | Wife | — | Illinois |
Pedigree Summary
Mary + 3 siblings
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)