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Mary Ball — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Ball across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1887), then head of a 7-person household.
Age 53
b. ~1887
Female
Spouse
Born: Poland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Ball |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Alien |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1887 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Phyllis Medenbury | Daughter | — | 25 | ~1915 |
| John Ball | Head | — | 54 | ~1886 |
| Harry Medenbury | Other | — | 31 | ~1909 |
| Harry Medenbury | Other | — | 5 | ~1935 |
| Peter Lencione | Other | — | 54 | ~1886 |
| Carol Medenbury | Other | — | 4 | ~1936 |
| Mary Ball | Spouse | — | 53 | ~1887 |
Census Appearances
1920
Cook, Illinois
Spouse, age 37
Cook, Illinois · implied b. ~1883 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Bala |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Poland |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | Housewife |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Polish |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
1930
Cook, Illinois
Other, age 48
Cook, Illinois · implied b. ~1882 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Ball |
| Given Name | Mary |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Poland |
| Naturalization Status | Alien |
| Year of Immigration | 1900 |
| Age at First Marriage | 24 |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | Chambermaid |
| Industry | Hotel |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Polish |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
1940
Cook-County, Illinois
Spouse, age 53
Cook-County, Illinois · implied b. ~1887 — 7 household members
| Surname | Ball |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Alien |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
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 Ball 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 Ball
Spouse · 1940 · age 53 · b. ~1887 · 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-t0627-00942-00851)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Irene Zmijewski | 14 | Daughter | — | Ill |
| 42 | John Ball | 54 | Head | Carpenter | Poland |
| 43 | Mary Ball THIS PERSON | 53 | Wife | — | Poland |
| 44 | Phyllis Medenbury | 25 | Daughter | — | Ill |
| 45 | Harry Medenbury | 31 | Son-in-law | Stock Man | Canada |
| 46 | Harry Jr. Medenbury | 5 | Grandson | — | Ill |
| 47 | Carol Jean Medenbury | 4 | Granddaughter | — | Ind |
| 48 | Peter Lencione | 54 | Boarder | Clerk | Italy |
| 49 | Roy Bates | 41 | Head | Trimmer | Tenn |
| 50 | Florence Bates | 36 | Wife | — | Tenn |
| 51 | Wilburn Bates | 15 | Son | — | Tenn |
| 52 | Edwin Bates | 9 | Son | — | Ind |
| 53 | Helen Bates | 6 | Daughter | — | Tenn |
| 54 | Mildred Seals | 19 | Daughter | Table Girl | Tenn |
| 55 | Curnel Seals | 23 | Son-in-law | Unloader | Tenn |
| 56 | Dorothy Jean Seals | 1 | Granddaughter | — | Tenn |
| 57 | Bill Hutson | 42 | Boarder | Painter | Ill |
| 58 | Ben Bass | 66 | Head | — | Tenn |
| 59 | Minnie Bass | 58 | Wife | — | Ala |
| 60 | William Bass | 80 | Brother | — | Tenn |
| 61 | Anna Sutton | 24 | Granddaughter | — | Ky |
| 62 | Jimmie Sutton | 2 | Great-grandson | — | Ill |
| 63 | Ben Anderson | 76 | Head | Realtor | Sweden |
| 64 | Hamp Bass | 33 | Head | Engineer | Ala |
| 65 | Elma Bass | 33 | Wife | — | Tenn |
| 66 | Roy Bass | 12 | Son | — | Ill |
| 67 | Donald Bass | 5 | Son | — | Ill |
| 68 | Eugene Bass | 3 | Son | — | Ill |
| 69 | Allienee Bass | 1 | Daughter | — | Ill |
| 70 | Joseph Kuczynski | 48 | Head | Baker | Poland |
| 71 | Helen Kuczynski | 46 | Wife | Clerk | Ill |
| 72 | Adeline Kuczynski | 14 | Daughter | — | Ill |
| 73 | Frank O'Malley | 45 | Head | Watchman | Ill |
| 74 | Eva O'Malley | 42 | Wife | — | Ill |
| 75 | Gertrude O'Malley | 15 | Daughter | — | Ill |
| 76 | Marie O'Malley | 8 | Daughter | — | Ind |
| 77 | Emma Laggage | 68 | Mother-in-law | — | Ill |
| 78 | Stanley Laggage | 22 | Roomer | Material Man | Ill |
| 79 | Lawrence Pierson | 25 | Head | Machinist | Ill |
| 80 | Elizabeth Pierson | 23 | Wife | — | Ill |
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)