JB
John Brock — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Milwaukee-County, Wisconsin
Our Model Tree links this John Brock across the 1930 and 1940 US Censuses in Milwaukee-County, Wisconsin (XGBoost, ~Confirmed) — first a head (b.~1901), then head of a 7-person household.
Age 39
b. ~1901
Male
Head
Born: Wisconsin
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Milwaukee-County, Wisconsin |
| Surname | Brock |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Milwaukee City |
| 1935 Residence (County) | Milw. |
| Additional Details | |
| Occupation | Janitor |
| Industry | Office Bldg. |
| Class of Worker | PW |
| Hours Worked | 52 |
| Income (1939) | 1140 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
| Occupation | Janitor |
| Township / Ward | Milwaukee City |
| Est. Birth Year | ~1901 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Paul Brock | Son | — | 8 | ~1932 |
| James Brock | Son | — | 5 | ~1935 |
| Leila Brock | Spouse | — | 40 | ~1900 |
| Richard Brock | Son | — | 3 | ~1937 |
| Bryan Siegfried | Son | — | 15 | ~1925 |
| Robert Brock | Son | — | 9 | ~1931 |
| John Brock | Head | — | 39 | ~1901 |
Census Appearances
1930
Milwaukee, Wisconsin
Head, age 29
Milwaukee, Wisconsin · implied b. ~1901 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brock |
| Given Name | John J. Jr. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| Age at First Marriage | 27 |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Wisconsin |
| Occupation | Operator |
| Industry | Elevator |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 14.00 |
| Radio Set | R |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1940
Milwaukee-County, Wisconsin
Head, age 39
Milwaukee-County, Wisconsin · implied b. ~1901 — 7 household members
| Surname | Brock |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Milwaukee City |
| 1935 Residence (County) | Milw. |
| Occupation | Janitor |
| Industry | Office Bldg. |
| Class of Worker | PW |
| Hours Worked | 52 |
| Income (1939) | 1140 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
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 John Brock across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Brock
Head · 1940 · age 39 · b. ~1901 · Wisconsin
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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 — Milwaukee-County, Wisconsin
Open full size
1940 US Federal Census — Milwaukee-County, Wisconsin
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-04547-00738)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John J. Brock THIS PERSON | 39 | Head | Janitor | Wisconsin |
| 42 | Leila L. Brock | 40 | Wife | — | Wisconsin |
| 43 | Bryan J. Siegfried | 15 | Son | — | Wisconsin |
| 44 | Robert J. Brock | 9 | Son | — | Wisconsin |
| 45 | Paul E. Brock | 8 | Son | — | Wisconsin |
| 46 | James A. Brock | 5 | Son | — | Wisconsin |
| 47 | Richard Brock | 3 | Son | — | Wisconsin |
| 48 | Vernon S. Kristopher | 47 | Head | Radio Worker | Wisconsin |
| 49 | Lillian Kristopher | 43 | Wife | — | Wisconsin |
| 50 | Arthur Ring | 43 | Head | Stone Cutter | Wisconsin |
| 51 | Della Ring | 44 | Wife | Labourer | Wisconsin |
| 52 | George Fless | 44 | Head | Labourer | Wisconsin |
| 53 | Ida Fless | 25 | Wife | — | Wisconsin |
| 54 | Dian Mae Fless | 0 | Daughter | — | Wisconsin |
| 55 | Joseph Horvath | 39 | Head | Tavern Keeper | Hungary |
| 56 | Josephine Horvath | 37 | Wife | — | Hungary |
| 57 | Joseph Jr. Horvath | 16 | Son | — | Wisconsin |
| 58 | Evelyn Horvath | 10 | Daughter | — | Wisconsin |
| 59 | Lewis E. Benz | 67 | Head | Clerk | Wisconsin |
| 60 | Clara S. Benz | 62 | Wife | — | Wisconsin |
| 61 | Augustine Kneesing | 88 | Mother-in-law | — | Germany |
| 62 | Herbert Peterson | 41 | Head | Foreman | Michigan |
| 63 | Esther Peterson | 42 | Wife | — | Wisconsin |
| 64 | Wallace Peterson | 16 | Son | — | Wisconsin |
| 65 | Harry Peterson | 15 | Son | — | Wisconsin |
| 66 | Lorraine Peterson | 14 | Daughter | — | Wisconsin |
| 67 | Geraldine Peterson | 12 | Daughter | — | Wisconsin |
| 68 | Mary Lou Peterson | 10 | Daughter | — | Wisconsin |
| 69 | Joan Peterson | 8 | Daughter | — | Wisconsin |
| 70 | John Peterson | 7 | Son | — | Wisconsin |
| 71 | Jeanette Peterson | 5 | Daughter | — | Wisconsin |
| 72 | Hubert Jr. Peterson | 3 | Son | — | Wisconsin |
| 73 | John Boos | 60 | Head | Foreman | Michigan |
| 74 | Winnie Boos | 54 | Wife | — | Germany |
| 75 | John Jr. Boos | 26 | Son | Clerical Worker | Wisconsin |
| 76 | Mary Boos | 63 | Sister | — | Wisconsin |
| 77 | Clarence E. Brandt | 33 | Head | Draftsman | England |
| 78 | Alice E. Brandt | 31 | Wife | — | Wisconsin |
| 79 | Matilda L. Brandt | 74 | Mother | — | Wisconsin |
| 80 | Adolph Gerswitz | 52 | Lodger | Bar Tender | Wisconsin |
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)