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 & Stella — first a daughter (b.~1913), then head of a 8-person household.
Age 27
b. ~1913
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Hayes |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Maywood |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Saleslady |
| Industry | Retail Department Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | Hs 4 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Saleslady |
| Township / Ward | Broadview Village |
| Est. Birth Year | ~1913 |
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 |
|---|---|---|---|---|
| Ellen Hayes | Daughter | — | 15 | ~1925 |
| Anne Henning | Daughter | — | 20 | ~1920 |
| Lillian Hayes | Daughter | — | 10 | ~1930 |
| Mary Hayes | Daughter | — | 27 | ~1913 |
| Ellen Hayes | Head | — | 48 | ~1892 |
| Christian Henning | Other | — | 21 | ~1919 |
| Patricia Henning | Other | — | 2 | ~1938 |
| James Hayes | Son | — | 18 | ~1922 |
Census Appearances
1920
Cook, Illinois
Daughter, age 7
Cook, Illinois · implied b. ~1913 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hayes |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 17
Cook, Illinois · implied b. ~1913 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hayes |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 27
Cook-County, Illinois · implied b. ~1913 — 8 household members
| Surname | Hayes |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Maywood |
| 1935 Residence (County) | Cook |
| Occupation | Saleslady |
| Industry | Retail Department Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | Hs 4 |
| 1935 Residence | Illinois |
| 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 Stella Hayes (~0.92 confidence) and father Cornelius Hayes (~0.92 confidence) and mother Mary Hayes (~0.92 confidence) and mother Ellen Hayes (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Hayes
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Stella Hayes
b. ~1884
Source mother
● Household
· direct · ~0.92
Father
Cornelius Hayes
b. ~1886
Source father
● Household
· direct · ~0.92
Mother
Mary Hayes
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Ellen Hayes
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Hayes
Daughter · 1940 · age 27 · b. ~1913 · Illinois
★ You are viewing this record
Sibling
Ellen Hayes
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lillian Hayes
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Hayes
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anne Henning
Sibling · 1940 · age 20
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-t0627-00786-00700)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Grace Conti | 22 | Brother-in-law | Salesman | Illinois |
| 2 | James O. Kitzman | 34 | Head | Lineman | Illinois |
| 3 | Emily G. Kitzman | 32 | Wife | — | Illinois |
| 4 | Mary L. Kitzman | 9 | Daughter | — | Illinois |
| 5 | Ruth C. Kitzman | 7 | Daughter | — | Illinois |
| 6 | Joseph J. Rippin | 35 | Head | Cashier | Illinois |
| 7 | Agnes Rippin | 36 | Wife | Stenographer | Michigan |
| 8 | Donald Rippin | 8 | Son | — | Illinois |
| 9 | Joseph Rippin | 6 | Son | — | Illinois |
| 10 | John Howie | 52 | Head | — | Scotland |
| 11 | Annie V. Howie | 50 | Wife | — | Scotland |
| 12 | David J. Howie | 22 | Son | — | Illinois |
| 13 | Frank H. Lawson | 29 | Head | Pressman | Illinois |
| 14 | Frieda C. Lawson | 28 | Wife | Telephone Operator | Wisconsin |
| 15 | Frank S. Lawson | 6 | Son | — | Illinois |
| 16 | Katherine Fritzler | 72 | Mother-in-law | — | Germany |
| 17 | Ellen Hayes | 48 | Head | Servant | England |
| 18 | Mary Hayes THIS PERSON | 27 | Daughter | Saleslady | Illinois |
| 19 | James Hayes | 18 | Son | — | Illinois |
| 20 | Ellen Hayes | 15 | Daughter | — | Illinois |
| 21 | Lillian Hayes | 10 | Daughter | — | Illinois |
| 22 | Christian Henning | 21 | Son-in-law | Peanut Spreader | Illinois |
| 23 | Anne M. Henning | 20 | Daughter | Cashier | Illinois |
| 24 | Patricia A. Henning | 2 | Granddaughter | — | Illinois |
| 25 | Peter P. Pomorin | 33 | Head | Biller | Illinois |
| 26 | Jeannette A. Pomorin | 32 | Wife | — | Illinois |
| 27 | Lorraine L. Pomorin | 11 | Daughter | — | Illinois |
| 28 | Delores J. Pomorin | 9 | Daughter | — | Illinois |
| 29 | Phyllis P. Pomorin | 4 | Daughter | — | Illinois |
| 30 | Harold J. Pilz | 33 | Head | Dairy Helper | Illinois |
| 31 | Jane B. Pilz | 33 | Wife | — | Illinois |
| 32 | Harold J. Pilz | 9 | Son | — | Illinois |
| 33 | Robert Pilz | 7 | Son | — | Illinois |
| 34 | Gerald Pilz | 6 | Son | — | Illinois |
| 35 | Barbara J. Pilz | 0 | Daughter | — | Illinois |
| 36 | Christian Wetterstedt | 55 | Head | Shipping Clerk | Illinois |
| 37 | Hattie A. Wetterstedt | 55 | Wife | — | Illinois |
| 38 | Earl H. Wetterstedt | 29 | Son | Automobile Mechanic | Illinois |
| 39 | Lois M. Wetterstedt | 19 | Daughter | Correspondent Assistant | Illinois |
| 40 | Samuel H. Roberts | 37 | Head | Dispatch Assistant | Illinois |
Pedigree Summary
Mary + 4 siblings
Gen 1 · 5 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)