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Mary Brock — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Mesa-County, Colorado
Our Model Tree links this Mary Brock across the 1930 and 1940 US Censuses in Mesa-County, Colorado (XGBoost, ~Confirmed) — first a daughter (b.~1920), then head of a 7-person household.
Age 20
b. ~1920
Female
Daughter
Born: Wyoming
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Mesa-County, Colorado |
| Surname | Brock |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Wyoming |
| 1935 Residence (City) | Precinct 2 |
| 1935 Residence (County) | Mesa |
| Additional Details | |
| Industry | 0 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same place |
| Birth State | Wyoming |
| Birth Country | United States |
| Birthplace (normalized) | wyoming |
| Township / Ward | Precinct 2 |
| Est. Birth Year | ~1920 |
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 |
|---|---|---|---|---|
| Raymond Brock | Son | — | 2 | ~1938 |
| John Brock | Head | — | 50 | ~1890 |
| Louis Brock | Son | — | 16 | ~1924 |
| Mary Brock | Daughter | — | 20 | ~1920 |
| John Brock | Son | — | 18 | ~1922 |
| Thomas Brock | Son | — | 15 | ~1925 |
| Nellie Brock | Spouse | — | 38 | ~1902 |
Census Appearances
1930
Mesa, Colorado
Daughter, age 10
Mesa, Colorado · implied b. ~1920 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brock |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Wyoming |
| Father's Birthplace | Italy |
| Mother's Birthplace | Russia |
| Can Read/Write | Yes |
| Birth State | Wyoming |
| Birth Country | United States |
| Birthplace (normalized) | wyoming |
1940
Mesa-County, Colorado
Daughter, age 20
Mesa-County, Colorado · implied b. ~1920 — 7 household members
| Surname | Brock |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Wyoming |
| 1935 Residence (City) | Precinct 2 |
| 1935 Residence (County) | Mesa |
| Industry | 0 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same place |
| Birth State | Wyoming |
| Birth Country | United States |
| Birthplace (normalized) | wyoming |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Brock
Daughter · 1940 · age 20 · b. ~1920 · Colorado
★ You are viewing this record
Sibling
Raymond Brock
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Brock
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Brock
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Louis Brock
Sibling · 1940 · age 16
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 — Mesa-County, Colorado
Open full size
1940 US Federal Census — Mesa-County, Colorado
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00470-00125)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Bell Sarah Hayes | 6 | Daughter | — | Colorado |
| 42 | Beverly Hayes | 5 | Daughter | — | Colorado |
| 43 | John Barnes | 27 | Head | Truck Driver | Colorado |
| 44 | Elva Barnes | 27 | Wife | — | Idaho |
| 45 | Clarence Barnes | 3 | Son | — | Colorado |
| 46 | B. Ernest Boswell | 23 | Head | Truck Driver | Texas |
| 47 | A. Lillian Boswell | 23 | Wife | — | Colorado |
| 48 | Lee Shirley Boswell | 4 | Daughter | — | Colorado |
| 49 | Lillian Boswell | 2 | Daughter | — | Colorado |
| 50 | Wayne Crewe | 22 | Hired man | Truck Driver | Texas |
| 51 | Francis House | 22 | Hired man | Truck Driver | Missouri |
| 52 | John Brock | 50 | Head | Farmer | Italy |
| 53 | Nellie Brock | 38 | Wife | — | Lithuania |
| 54 | Mary Brock THIS PERSON | 20 | Daughter | — | Wyoming |
| 55 | John Brock | 18 | Son | Farmer | Colorado |
| 56 | Louis Brock | 16 | Son | — | Colorado |
| 57 | Thomas Brock | 15 | Son | — | Colorado |
| 58 | Raymond Brock | 2 | Son | — | Colorado |
| 59 | Joel Peeples | 39 | Head | Supervisor | Colorado |
| 60 | Winifred Peeples | 44 | Wife | — | Iowa |
| 61 | Frank Downer | 61 | Head | Farmer | Missouri |
| 62 | Maude Downer | 67 | Wife | — | Illinois |
| 63 | P. Walter Smith | 30 | Head | Farmer | Colorado |
| 64 | M. Babe Smith | 25 | Wife | — | Colorado |
| 65 | Joe Fuller | 44 | Head | Foreman | Missouri |
| 66 | Bernice Fuller | 40 | Wife | — | Indiana |
| 67 | Lodema Vincent | 75 | Mother-in-law | — | Indiana |
| 68 | Daughter Gloria | None | F | Farming | — |
| 69 | Son Eldon | None | M | — | — |
| 70 | Milliard Morris | 58 | Brother-in-law | Farmer | Indiana |
| 71 | Floyd Lewis | 35 | Head | Farmer | Kansas |
| 72 | Ola Lewis | 28 | Wife | — | Kansas |
| 73 | C. Luther Whinney | 42 | Head | Farmer | Indiana |
| 74 | Cora Whinney | 39 | Wife | — | Indiana |
| 75 | Jean Whinney | 15 | Daughter | — | Utah |
| 76 | Rhoda Whinney | 12 | Daughter | — | Oklahoma |
| 77 | Wayne Whinney | 9 | Son | — | Colorado |
| 78 | Betty Whinney | 3 | Daughter | — | Colorado |
| 79 | R. Charles Brain | 41 | Head | Farmer | Iowa |
| 80 | Nellie Brain | 37 | Wife | — | Minnesota |
Related Census Records
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)