MH
Mary Hays — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Hays across the 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1920), then head of a 8-person household.
Age 10
b. ~1920
Female
Daughter
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Hays |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Illinois |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1920 |
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 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Jay Hays | Head | — | 43 | ~1887 |
| Mary Hays | Daughter | — | 10 | ~1920 |
| Ida Barre | Other | — | 66 | ~1864 |
| Edna Barre | Other | — | 25 | ~1905 |
| James Hays | Son | — | 15 | ~1915 |
| Charlotte Hays | Spouse | — | 39 | ~1891 |
| Robert Hays | Son | — | 13 | ~1917 |
| George Hays | Son | — | 12 | ~1918 |
Census Appearances
1930
Cook, Illinois
Daughter, age 10
Cook, Illinois · implied b. ~1920 — 8 household members
| Surname | Hays |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Other, age 21
Cook-County, Illinois · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hays |
| Given Name | Marjorie E |
| Relationship to Head | Niece |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Highest Grade | C 3 |
| 1935 Residence | Same House |
| 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 Hays across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Hays
Daughter · 1930 · age 10 · b. ~1920 · Illinois
★ You are viewing this record
Sibling
George Hays
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Hays
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Hays
Sibling · 1930 · 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
1930 US Federal Census — Cook, Illinois
Open full size
1930 US Federal Census — Cook, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel421:0988)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Erasmus M. Brinker | 64 | Head | Lawyer | Ohio |
| 2 | Mary S-H Brinker | 67 | Wife | — | Ohio |
| 3 | Catherine Brinker | 31 | Daughter | — | Ohio |
| 4 | Augusta H. Kiesling | 71 | Head | — | Germany |
| 5 | Thelma Kiesling | 42 | Son | Manager | Illinois |
| 6 | Viola Kiesling | 27 | Daughter | Office Asst. | Minnesota |
| 7 | Frank R. Strauss | 69 | Head | Salesman | Germany |
| 8 | Leah H. Strauss | 61 | Wife | — | Prussia |
| 9 | Harold D. Strauss | 33 | Son | Salesman | Illinois |
| 10 | Lawrence Strauss | 31 | Son | Salesman | Illinois |
| 11 | F. Richard Strauss | 24 | Son | Order Clerk | Illinois |
| 12 | Peter Brown | 32 | Head | Salesman | Pennsylvania |
| 13 | Nancy J. Brown | 2 | Daughter | — | Illinois |
| 14 | Thomas Brown | 68 | Mary-H Mother | — | Pennsylvania |
| 15 | Wesley Bresser | 40 | Head | — | Louisiana |
| 16 | Jean E. Bresser | 17 | Daughter | Operator | Illinois |
| 17 | Frank A. Davis | 32 | Head | Bookkeeper | Indiana |
| 18 | Ruth R-H Davis | 32 | Wife | — | Missouri |
| 19 | Susan Rombach | 70 | Mother-in-law | — | Indiana |
| 20 | Marjorie L. Cox | 31 | Sister-in-law | Bookkeeper | Indiana |
| 21 | Frank Behrendt | 63 | Head | Promoter | Wisconsin |
| 22 | Cora N. Behrendt | 62 | Wife | — | Vermont |
| 23 | Martha B. Carr | 30 | Daughter | Secretary | Illinois |
| 24 | Alice E. Carr | 9 | Granddaughter | — | Illinois |
| 25 | John Hardaway | 48 | Head | Salesman | Alabama |
| 26 | Mary C-H Hardaway | 47 | Wife | — | Kentucky |
| 27 | Jack H. Hardaway | 21 | Son | — | Alabama |
| 28 | Annie Stolefsky | 60 | Head | — | Poland |
| 29 | Rose Stolefsky | 47 | Daughter | — | Poland |
| 30 | Frederick H. Moss | 34 | Head | Assistant Sales Manager | Ohio |
| 31 | Bertha Moss | 61 | Wife | Practitioner | Ohio |
| 32 | Fred Moss | 69 | Father | — | Ohio |
| 33 | Earl E. Montgomery | 55 | Head | Time Keeper | Illinois |
| 34 | Belle H. Montgomery | 45 | Sister | — | Illinois |
| 35 | De Volney Bowen | 58 | Head | Dentist | Indiana |
| 36 | Jessie H. Bowen | 54 | Wife | Practitioner | Illinois |
| 37 | Jay W. Hays | 43 | Head | President | Pennsylvania |
| 38 | Charlotte M. Hays | 39 | Wife | — | Illinois |
| 39 | James W. Hays | 15 | Son | — | Illinois |
| 40 | Robert S. Hays | 13 | Son | — | Illinois |
| 41 | George L. Hays | 12 | Son | — | Illinois |
| 42 | Mary C. Hays THIS PERSON | 10 | Daughter | — | Illinois |
| 43 | Ida C. Barre | 66 | Mother-in-law | — | Illinois |
| 44 | Edna R. Barre | 25 | Sister-in-law | Asst. Of Manager | Illinois |
| 45 | Solomon Mutner | 63 | Head | Proprietor | Poland |
| 46 | Sarah H. Mutner | 47 | Wife | — | Courland |
| 47 | David H. Mutner | 15 | Son | — | Illinois |
| 48 | Boris L. Mutner | 13 | Son | — | Illinois |
| 49 | Ruth Y. Mutner | 8 | Daughter | — | Illinois |
| 50 | Alice H-H Clark | 73 | Head | — | Ohio |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)