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Mary Brock — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lake-County, Illinois
Our Model Tree links this Mary Brock across the 1920, 1930 and 1940 US Censuses in Lake-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1893), then head of a 7-person household.
Age 47
b. ~1893
Female
Spouse
Born: England
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Lake-County, Illinois |
| Surname | Brock |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Waukegan |
| 1935 Residence (County) | Lake |
| Naturalization Status | Naturalized |
| Additional Details | |
| Industry | 0 |
| Highest Grade | G 8 |
| 1935 Residence | Illinois |
| Birth Country | England |
| Birthplace (normalized) | england |
| Township / Ward | North Prairie |
| Est. Birth Year | ~1893 |
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 |
|---|---|---|---|---|
| Elizabeth Brock | Daughter | — | 13 | ~1927 |
| Frank Brock | Head | — | 55 | ~1885 |
| Mary Brock | Spouse | — | 47 | ~1893 |
| Edward Brock | Son | — | 18 | ~1922 |
| Adelia Brock | Daughter | — | 11 | ~1929 |
| Reginald Brock | Son | — | 21 | ~1919 |
| Charles Brock | Son | — | 24 | ~1916 |
Census Appearances
1920
Lake, Illinois
Spouse, age 26
Lake, Illinois · implied b. ~1894 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brock |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | England |
| Year of Immigration | 1912 |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | England |
| Birthplace (normalized) | england |
1930
Lake, Illinois
Other, age 36
Lake, Illinois · implied b. ~1894 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brock |
| Given Name | Mary |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | England |
| Naturalization Status | Naturalized |
| Year of Immigration | 1910 |
| Age at First Marriage | 18 |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | England |
| Birthplace (normalized) | england |
1940
Lake-County, Illinois
Spouse, age 47
Lake-County, Illinois · implied b. ~1893 — 7 household members
| Surname | Brock |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Waukegan |
| 1935 Residence (County) | Lake |
| Naturalization Status | Naturalized |
| Industry | 0 |
| Highest Grade | G 8 |
| 1935 Residence | Illinois |
| Birth Country | England |
| Birthplace (normalized) | england |
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 Brock 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 Brock
Spouse · 1940 · age 47 · b. ~1893 · 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 — Lake-County, Illinois
Open full size
1940 US Federal Census — Lake-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00828-00190)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Walter Muehl | 34 | Head | Tester | Illinois |
| 2 | Agnes Muehl | 27 | Wife | — | Texas |
| 3 | Clarence Schultz | 33 | Head | Paint Grinder | Ohio |
| 4 | Mildred Schultz | 31 | Wife | — | Minnesota |
| 5 | Donald Schultz | 7 | Son | — | Minnesota |
| 6 | Donna Schultz | 7 | Son | — | Minnesota |
| 7 | Diane Schultz | 6 | Daughter | — | Minnesota |
| 8 | Gerald Schultz | 4 | Son | — | Illinois |
| 9 | Frieda Mcgulvary | 43 | Sister | — | Wisconsin |
| 10 | William Mcgulvary | 22 | Nephew | Laborer | Ohio |
| 11 | Dorothy Mcgulvary | 13 | Niece | — | Ohio |
| 12 | Donald Mcgulvary | 11 | Nephew | — | Illinois |
| 13 | James Mcgulvary | 5 | Nephew | — | Illinois |
| 14 | Frank Bessler | 60 | Head | Laborer | Pennsylvania |
| 15 | Clara Bessler | 61 | Wife | — | Indiana |
| 16 | Raymond Horning | 9 | Lodger | — | Illinois |
| 17 | Henry Beideman | 50 | Head | Inspector | Illinois |
| 18 | Leona Beideman | 39 | Wife | — | Minnesota |
| 19 | Jane Beideman | 15 | Daughter | — | Wisconsin |
| 20 | Claudie Beideman | 10 | Daughter | — | Illinois |
| 21 | John Beideman | 9 | Son | — | Illinois |
| 22 | David Beideman | 6 | Son | — | Illinois |
| 23 | Mary Beideman | 5 | Daughter | — | Illinois |
| 24 | Carol Beideman | 5 | Daughter | — | Illinois |
| 25 | Delta Pobeschke | 31 | Sister-in-law | — | Wisconsin |
| 26 | Jacob Vanderpel | 33 | Head | Laborer | Holland |
| 27 | Myra Vanderpel | 23 | Wife | — | Wisconsin |
| 28 | Floyd Vanderpel | 5 | Son | — | Wisconsin |
| 29 | Claire Vanderpel | 3 | Daughter | — | Illinois |
| 30 | Donald Clover | 36 | Head | Deliveryman | Illinois |
| 31 | Alice Clover | 34 | Wife | Factory Work | Illinois |
| 32 | Jean Clover | 14 | Daughter | — | Illinois |
| 33 | Alice Clover | 2 | Daughter | — | Illinois |
| 34 | Frank Brock | 55 | Head | Laborer | Tennessee |
| 35 | Mary Brock THIS PERSON | 47 | Wife | — | England |
| 36 | Charles Brock | 24 | Son | Laborer | Illinois |
| 37 | Reginald Brock | 21 | Son | Laborer | Illinois |
| 38 | Edward Brock | 18 | Son | — | Illinois |
| 39 | Elizabeth Brock | 13 | Daughter | — | Illinois |
| 40 | Adelia Brock | 11 | Daughter | — | 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)