MH
Mary Hayes — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Hayes across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents John & Mary — first a daughter (b.~1908), then head of a 4-person household.
Age 32
b. ~1908
Female
Daughter
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Hayes |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Industry | 0 |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| Est. Birth Year | ~1908 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Hayes | Daughter | — | 32 | ~1908 |
| John Hayes | Head | — | 61 | ~1879 |
| James Hayes | Son | — | 28 | ~1912 |
| Mary Hayes | Spouse | — | 58 | ~1882 |
Census Appearances
1920
Cook, Illinois
Daughter, age 12
Cook, Illinois · implied b. ~1908 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hayes |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Naturalization Status | Naturalized |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 22
Cook, Illinois · implied b. ~1908 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hayes |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| 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
Cook-County, Illinois
Daughter, age 32
Cook-County, Illinois · implied b. ~1908 — 4 household members
| Surname | Hayes |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Industry | 0 |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 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 Hayes across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Hayes (~0.92 confidence) and mother Mary Hayes (~0.92 confidence) and father William Hayes (~0.92 confidence) and mother Kathryn Hayes (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Hayes
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Mary Hayes
b. ~1882
Source mother
● Household
· direct · ~0.92
Father
William Hayes
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Kathryn Hayes
b. ~1888
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Hayes
Daughter · 1940 · age 32 · b. ~1908 · Illinois
★ You are viewing this record
Sibling
James Hayes
Sibling · 1940 · age 28
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-t0627-00980-00093)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | May J Morgan | 29 | Wife | — | Illinois |
| 42 | Morris Fishbein | 48 | Head | Proprietor | Russia |
| 43 | Sara Fishbein | 45 | Wife | — | Russia |
| 44 | Shirley Fishbein | 21 | Daughter | Clerk | Illinois |
| 45 | Marion Fishbein | 14 | Son | — | Illinois |
| 46 | Muriel Fishbein | 8 | Son | — | Illinois |
| 47 | Barney O'Hara | 64 | Head | Electrical Worker | Ireland |
| 48 | Tillie O'Hara | 64 | Wife | — | Pennsylvania |
| 49 | Ruth Preis | 37 | Daughter | Waitress | Illinois |
| 50 | Lorea Rast | 35 | Lodger | — | Virginia |
| 51 | Clarence Raehl | 43 | Head | Printer | Illinois |
| 52 | Lucielle Raehl | 32 | Wife | — | Illinois |
| 53 | Richard W Raehl | 19 | Son | Shop Helper | Illinois |
| 54 | Eugene E Raehl | 18 | Son | — | Illinois |
| 55 | Luciell A Raehl | 17 | Daughter | New Worker | Illinois |
| 56 | Geraldine Raehl | 13 | Daughter | — | Illinois |
| 57 | Thomas C Raehl | 9 | Son | — | Illinois |
| 58 | Leroy M Hostetter | 77 | Head | Salesman | Illinois |
| 59 | Emily J Hostetter | 75 | Wife | — | Virginia |
| 60 | Dennis Gallerian | 30 | Head | Policeman | Illinois |
| 61 | Margaret M Gallerian | 25 | Wife | — | Illinois |
| 62 | Dennis Gallerian | 1 | Son | — | Illinois |
| 63 | Emily E Lubecker | 56 | Mother-in-law | Clerical Work | Canada |
| 64 | George E Diehl | 50 | Head | Mechanic | New York |
| 65 | Ethel D Diehl | 50 | Wife | — | Ohio |
| 66 | Jane Glasspell | 75 | Head | — | Illinois |
| 67 | Edward Galvin | 71 | Lodger | Chief Engineer | England |
| 68 | William Netcoff | 72 | Head | — | Maryland |
| 69 | Harriet Netcoff | 61 | Wife | — | Wisconsin |
| 70 | Raymond Netcoff | 40 | Son | Wool Sorter | Iowa |
| 71 | William Jr Netcoff | 32 | Son | Clerical Work | Illinois |
| 72 | Donald Netcoff | 30 | Son | Watch Maker | Illinois |
| 73 | Katheryn Cargill | 54 | Wife | — | Illinois |
| 74 | Mary K Cargill | 29 | Daughter | Comptometer | Illinois |
| 75 | Paula L Cargill | 25 | Daughter | Teller | Illinois |
| 76 | Joseph W Spooling | 62 | Brother | Mail Clerk | Illinois |
| 77 | John W Hayes | 61 | Head | Policeman | Ireland |
| 78 | Mary Hayes | 58 | Wife | — | Ireland |
| 79 | Mary E Hayes THIS PERSON | 32 | Daughter | — | Illinois |
| 80 | James E Hayes | 28 | Son | New Worker | Illinois |
Pedigree Summary
Mary + 1 sibling
Gen 1 · 4 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)