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Mary Lyon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Lyon across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1861), then head of a 2-person household.
Age 79
b. ~1861
Female
Head
Born: England
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Lyon |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 79 |
| Marital Status | Widowed |
| Birthplace | England |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Hours Worked | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Illinois |
| Birth Country | England |
| Birthplace (normalized) | england |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1861 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Lyon | Head | — | 79 | ~1861 |
| Clara Lyon | Daughter | — | 44 | ~1896 |
Census Appearances
1920
Cook, Illinois
Other, age 61
Cook, Illinois · implied b. ~1859 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lyons |
| Given Name | Mary |
| Relationship to Head | Mother-in-law |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Widowed |
| Birthplace | England |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | England |
| Year of Naturalization | Un |
| Birthplace (normalized) | england |
1930
Cook, Illinois
Head, age 68
Cook, Illinois · implied b. ~1862
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Lyons |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 68 |
| Marital Status | Widowed |
| Birthplace | England |
| Naturalization Status | Naturalized |
| Year of Immigration | 1862 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 11,000 |
| Radio Set | R |
| Birth Country | England |
| Birthplace (normalized) | england |
1940
Cook-County, Illinois
Head, age 79
Cook-County, Illinois · implied b. ~1861 — 2 household members
| Surname | Lyon |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 79 |
| Marital Status | Widowed |
| Birthplace | England |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Hours Worked | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Illinois |
| Birth Country | England |
| Birthplace (normalized) | england |
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 Lyon across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Lyon
Head · 1940 · age 79 · b. ~1861 · Illinois
★ You are viewing this record
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-t0627-00938-00136)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary E. Griffiths | 16 | Daughter | — | Illinois |
| 2 | Mary Lyon THIS PERSON | 79 | Head | — | England |
| 3 | Clara M. Lyon | 44 | Daughter | — | Illinois |
| 4 | Dale S. Allen | 31 | Head | Accountant | Iowa |
| 5 | Dorothy Allen | 25 | Wife | — | Illinois |
| 6 | Charles Scherer | 34 | Head | Accountant | Illinois |
| 7 | Berniece Scherer | 31 | Wife | — | Illinois |
| 8 | Charles Jr. Scherer | 8 | Son | — | Illinois |
| 9 | Harry S. Potter | 49 | Head | Bank Officer | Kansas |
| 10 | Ruth Potter | 43 | Wife | — | Missouri |
| 11 | Harry Potter | 19 | Son | New Worker | Illinois |
| 12 | Robert A. Abernathy | 38 | Head | Weighmaster | Indiana |
| 13 | Leonia Abernathy | 37 | Wife | Office Clerk | Indiana |
| 14 | Richard Abernathy | 18 | Son | — | Indiana |
| 15 | Thomas Abernathy | 16 | Son | — | Illinois |
| 16 | Kitty Davidson | 38 | Head | — | New York |
| 17 | Harriet Davidson | 19 | Daughter | Model | New York |
| 18 | Shirley Davidson | 9 | Daughter | — | Wisconsin |
| 19 | Robert Wolfson | 36 | Head | Mechanic Automobile | Russia |
| 20 | Augusta Wolfson | 34 | Wife | — | Russia |
| 21 | Rita Wolfson | 14 | Daughter | — | New Jersey |
| 22 | Edna Wolfson | 9 | Daughter | — | Illinois |
| 23 | Sylvia Trachtenberg | 17 | Niece | New Worker | New Jersey |
| 24 | Thomas J. Shipley | 47 | Head | — | Illinois |
| 25 | Lily Shipley | 47 | Wife | — | Kentucky |
| 26 | William Shipley | 20 | Son | Office Messenger | Illinois |
| 27 | Emery J. Sorensen | 31 | Head | Rotary Pressman | Illinois |
| 28 | Viola Sorensen | 27 | Wife | — | Michigan |
| 29 | Daniel Foreman | 43 | Head | Civil Engineer | Illinois |
| 30 | Rose Foreman | 40 | Wife | — | Illinois |
| 31 | Daniel Jr. Foreman | 14 | Son | — | Illinois |
| 32 | Nelle J. Mccoy | 58 | Head | — | Iowa |
| 33 | Sarah Mccoy | 50 | Sister | Practical Nurse | Iowa |
| 34 | Elberta Callahan | 49 | Head | Chauffeur | Kentucky |
| 35 | Foster Callahan | 43 | Wife | — | Illinois |
| 36 | Ella May Callahan | 17 | Daughter | — | Illinois |
| 37 | Geraldine Callahan | 13 | Daughter | — | Illinois |
| 38 | Hugh Walker | 42 | Head | Butcher Meat Cutter | Illinois |
| 39 | Mariana Walker | 38 | Wife | — | Kansas |
| 40 | Catherine Mccormick | 32 | Roomer | Teacher | 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)