MP
Mary Pace — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Pace across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 9-person household.
Age 18
b. ~1922
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Pace |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | New Marker |
| Class of Worker | PW |
| Hours Worked | 20 |
| Income (1939) | 0 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | New Marker |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1922 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Andrew Pace | Son | — | 9 | ~1931 |
| Joseph Pace | Son | — | 11 | ~1929 |
| Anthony Pace | Son | — | 6 | ~1934 |
| Anna Pace | Head | — | 36 | ~1904 |
| Mary Pace | Daughter | — | 18 | ~1922 |
| Rosetta Pace | Daughter | — | 7 | ~1933 |
| Rose Pace | Daughter | — | 14 | ~1926 |
| Bernice Pace | Daughter | — | 16 | ~1924 |
| Michael Pace | Son | — | 2 | ~1938 |
Census Appearances
1930
Cook, Illinois
Daughter, age 8
Cook, Illinois · implied b. ~1922 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Pak |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 18
Cook-County, Illinois · implied b. ~1922 — 9 household members
| Surname | Pace |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | New Marker |
| Class of Worker | PW |
| Hours Worked | 20 |
| Income (1939) | 0 |
| Highest Grade | Hs 2 |
| 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 Pace across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Pace
Daughter · 1940 · age 18 · b. ~1922 · Illinois
★ You are viewing this record
Sibling
Rose Pace
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Andrew Pace
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Pace
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Pace
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernice Pace
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rosetta Pace
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anthony Pace
Sibling · 1940 · age 6
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-t0627-00986-00534)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edward Lukaski | 18 | Son | Packing | Illinois |
| 2 | Stanley Kopczynski | 50 | Head | Nonshau | Austria |
| 3 | Catherine Kopczynski | 39 | Wife | — | Austria |
| 4 | Helen Kopczynski | 17 | Daughter | — | Illinois |
| 5 | Eugene Kopczynski | 11 | Son | — | Illinois |
| 6 | Anna Pace | 36 | Head | — | Illinois |
| 7 | Mary Pace THIS PERSON | 18 | Daughter | New Marker | Illinois |
| 8 | Bernice Pace | 16 | Daughter | — | Illinois |
| 9 | Rose Pace | 14 | Daughter | — | Illinois |
| 10 | Joseph Pace | 11 | Son | — | Illinois |
| 11 | Andrew Pace | 9 | Son | — | Illinois |
| 12 | Rosetta Pace | 7 | Daughter | — | Illinois |
| 13 | Anthony Pace | 6 | Son | — | Illinois |
| 14 | Michael Pace | 2 | Son | — | Illinois |
| 15 | Joseph Wallenstein | 46 | Head | Carpenter | Russia |
| 16 | Sarah Wallenstein | 45 | Wife | — | Russia |
| 17 | Rae Wallenstein | 25 | Daughter | Dressmaker | Ohio |
| 18 | Zenon Vaguez | 38 | Head | Machinist | Mexico |
| 19 | Amelia Vaguez | 32 | Wife | — | Mexico |
| 20 | Edward Vaguez | 11 | Son | — | Illinois |
| 21 | Amelia Vaguez | 7 | Daughter | — | Illinois |
| 22 | Dom Janiszewski | 40 | Head | Window Washer | Russia |
| 23 | Marie Janiszewski | 32 | Wife | Studio Operator | Illinois |
| 24 | Dominick Janiszewski | 14 | Son | — | Illinois |
| 25 | Lorraine Janiszewski | 7 | Daughter | — | Illinois |
| 26 | Eugene Janiszewski | 6 | Son | — | Illinois |
| 27 | Angeline Janiszewski | 2 | Daughter | — | Illinois |
| 28 | Alexander Grech | 74 | Head | Translator | Russia |
| 29 | Clara Grech | 76 | Wife | — | Russia |
| 30 | Walter Grech | 29 | Son | Bookkeeper | Russia |
| 31 | Catherine Grech | 24 | Daughter | Stenographer | Penn |
| 32 | Anna Putary | 45 | Head | Seamstress | Russia |
| 33 | Lillian Putary | 18 | Daughter | Sales Clerk | Mich |
| 34 | Helen Putary | 16 | Daughter | Office Work | Mich |
| 35 | Harry Malinay | 66 | Head | — | Poland |
| 36 | Anna Malinay | 65 | Wife | — | Poland |
| 37 | Irving Malinay | 27 | Son | Order Clerk | Illinois |
| 38 | David Malinay | 39 | Son | Salesman | Poland |
| 39 | Arthur Malinay | 17 | Grandson | Clerk | Illinois |
| 40 | Bernard Malinay | 14 | Grandson | — | 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)