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Mary Mueller — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Mueller across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1909), then head of a 10-person household.
Age 31
b. ~1909
Female
Spouse
Born: Hungary
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Mueller |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Hungary |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | G-8 |
| 1935 Residence | Same house |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
| Township / Ward | Chicago |
| Est. Birth Year | ~1909 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Fred Mueller | Other | — | 25 | ~1915 |
| Joseph Mueller | Other | — | 21 | ~1919 |
| Ronald Mueller | Son | — | 5 | ~1935 |
| George Mueller | Head | — | 41 | ~1899 |
| Robert Mueller | Son | — | 9 | ~1931 |
| Walter Mueller | Other | — | 21 | ~1919 |
| Alice Mueller | Other | — | 19 | ~1921 |
| Mary Mueller | Spouse | — | 31 | ~1909 |
| Richard Mueller | Son | — | 6 | ~1934 |
| Evelyn Mueller | Other | — | 20 | ~1920 |
Census Appearances
1930
Cook, Illinois
Other, age 17
Cook, Illinois · implied b. ~1913 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mueller |
| Given Name | Mary |
| Relationship to Head | Maid |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Hungary |
| Naturalization Status | Alien |
| Year of Immigration | 1927 |
| Father's Birthplace | Hungary |
| Mother's Birthplace | Hungary |
| Occupation | Maid |
| Industry | Private Family |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Hungarian |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
1940
Cook-County, Illinois
Spouse, age 31
Cook-County, Illinois · implied b. ~1909 — 10 household members
| Surname | Mueller |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Hungary |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Highest Grade | G-8 |
| 1935 Residence | Same house |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
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 Mueller across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mueller
Spouse · 1940 · age 31 · b. ~1909 · Illinois
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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-t0627-01008-00709)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Fred Calistri | 26 | Head | Baker | Italy |
| 2 | Nida Calistri | 25 | Wife | Machine Operator | Illinois |
| 3 | William Sladerity | 31 | Head | Inspector | Illinois |
| 4 | Agnes Sladerity | 28 | Wife | — | Illinois |
| 5 | William Jr. Sladerity | 3 | Son | — | Illinois |
| 6 | Ignatius Wolfinger | 47 | Head | Laborer | Hungary |
| 7 | Mary Wolfinger | 40 | Wife | Chamber Maid | Hungary |
| 8 | Giselle Wolfinger | 21 | Daughter | Milliner | Hungary |
| 9 | Pauline Wolfinger | 17 | Daughter | Assembler | Hungary |
| 10 | Ignatius Jr. Wolfinger | 12 | Son | — | Illinois |
| 11 | Nicholas Meng | 54 | Head | Laborer | Hungary |
| 12 | Theresa Meng | 52 | Wife | — | Austria |
| 13 | Tony Piazza | 25 | Head | Printer | Missouri |
| 14 | Frances Piazza | 22 | Wife | — | Illinois |
| 15 | Anthony Piazza | 2 | Son | — | Illinois |
| 16 | Sam Aiello | 21 | Head | Welder | Illinois |
| 17 | Eleanor Aiello | 20 | Wife | — | Illinois |
| 18 | Patricia Aiello | 0 | Daughter | — | Illinois |
| 19 | Tony Gardener | 29 | Head | Peddler | Illinois |
| 20 | Jeanette Gardener | 27 | Wife | — | Michigan |
| 21 | James Gardener | 3 | Son | — | Illinois |
| 22 | Adam Rigo | 71 | Head | Musician | Pennsylvania |
| 23 | Helen Rigo | 21 | Wife | — | Illinois |
| 24 | George Mueller | 41 | Head | Trucking | Illinois |
| 25 | Mary Mueller THIS PERSON | 31 | Wife | — | Hungary |
| 26 | Robert Mueller | 9 | Son | — | Illinois |
| 27 | Richard Mueller | 6 | Son | — | Illinois |
| 28 | Ronald Mueller | 5 | Son | — | Illinois |
| 29 | Joseph Mueller | 21 | Brother | Trucking | Illinois |
| 30 | Walter Mueller | 21 | Brother | New Worker | Illinois |
| 31 | Fred Mueller | 25 | Brother | Trucking | Illinois |
| 32 | Evelyn Mueller | 20 | Sister | Miscellaneous Worker | Illinois |
| 33 | Alice Mueller | 19 | Sister | New Worker | Illinois |
| 34 | John Bohn | 51 | Head | Tailor | Austria |
| 35 | Robert Dawson | 31 | Head | — | Kentucky |
| 36 | Christine Dawson | 30 | Wife | Laundress | Illinois |
| 37 | Billy Dawson | 5 | Son | — | Illinois |
| 38 | David Willis | 60 | Head | — | Illinois |
| 39 | Preston Beatty | 45 | Head | Mechanist | French Canada |
| 40 | Betty Beatty | 29 | Wife | — | Arkansas |
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)