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Mary Brooks — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this Mary Brooks across the 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1924), then head of a 14-person household.
Age 16
b. ~1924
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Brooks |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Highest Grade | Hs 1 |
| 1935 Residence | Same Place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1924 |
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.
14 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mildred Brooks | Daughter | — | 9 | ~1931 |
| Mary Brooks | Daughter | — | 16 | ~1924 |
| Irene Brooks | Daughter | — | 21 | ~1919 |
| Dorothy Brooks | Daughter | — | 11 | ~1929 |
| Laura Brooks | Daughter | — | 17 | ~1923 |
| Beulah Brooks | Daughter | — | 12 | ~1928 |
| Eli Brooks | Head | — | 48 | ~1892 |
| Theodore Brooks | Son | — | 23 | ~1917 |
| William Brooks | Son | — | 13 | ~1927 |
| Philly Brooks | Son | — | 5 | ~1935 |
| Bert Brooks | Son | — | 26 | ~1914 |
| Richard Brooks | Son | — | 24 | ~1916 |
| James Brooks | Son | — | 20 | ~1920 |
| Linnett Brooks | Spouse | — | 48 | ~1892 |
Census Appearances
1930
Polk, Iowa
Daughter, age 6
Polk, Iowa · implied b. ~1924 — 14 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brooks |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Daughter, age 16
Polk-County, Iowa · implied b. ~1924 — 14 household members
| Surname | Brooks |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Highest Grade | Hs 1 |
| 1935 Residence | Same Place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Brooks across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Brooks
Daughter · 1940 · age 16 · b. ~1924 · Iowa
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Sibling
Philly Brooks
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bert Brooks
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mildred Brooks
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Irene Brooks
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Theodore Brooks
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Beulah Brooks
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Brooks
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Laura Brooks
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Brooks
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Brooks
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Brooks
Sibling · 1940 · age 24
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 — Polk-County, Iowa
Open full size
1940 US Federal Census — Polk-County, Iowa
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01197-00650)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | James J. Brown | 3 | Son | — | Iowa |
| 2 | John J. Brown | 2 | Son | — | Iowa |
| 3 | Sharon Brown | 0 | Daughter | — | Iowa |
| 4 | Donald M. Bradford | 21 | Head | Machinist | Iowa |
| 5 | Jean M. Bradford | 18 | Wife | — | Iowa |
| 6 | George R. Rouse | 30 | Head | Mechanic | Iowa |
| 7 | Effie M. Rouse | 33 | Wife | — | Illinois |
| 8 | (Trailer) Rouse | None | — | — | — |
| 9 | James A. Ferrier | 35 | Head | Coal Truck Driver | Iowa |
| 10 | Marie O. Ferrier | 30 | Wife | — | Iowa |
| 11 | Charles Toole | 67 | Head | Laborer | Indiana |
| 12 | Merle R. Marvin | 25 | Head | Carpenter Helper | Iowa |
| 13 | Alice D. Marvin | 19 | Wife | — | Iowa |
| 14 | Patrick F. O'Brien | 58 | Head | Laborer | Iowa |
| 15 | Elizabeth O'Brien | 57 | Wife | — | Iowa |
| 16 | Charles A. O'Brien | 26 | Son | Laborer | Iowa |
| 17 | Evelyn M. Cavanaugh | 57 | Head | — | Iowa |
| 18 | Walter H. Mccreary | 48 | Head | Brakeman | Iowa |
| 19 | Vera Mccreary | 36 | Wife | Hosiery Finisher | Iowa |
| 20 | Richard Morton | 58 | Head | Laborer | Missouri |
| 21 | Mattie Morton | 51 | Wife | — | Missouri |
| 22 | Carl Morton | 18 | Son | Laborer | Iowa |
| 23 | Charles Stapleton | 71 | Head | — | Missouri |
| 24 | Emma Stapleton | 64 | Wife | — | Missouri |
| 25 | (Trailer) Stapleton | None | — | — | — |
| 26 | Eli Brooks | 48 | Head | Miner | Iowa |
| 27 | Linnett Brooks | 48 | Wife | — | Iowa |
| 28 | Bert Brooks | 26 | Son | Miner | Iowa |
| 29 | Richard Brooks | 24 | Son | Miner | Iowa |
| 30 | Theodore Brooks | 23 | Son | Die Man | Iowa |
| 31 | Irene Brooks | 21 | Daughter | Maid | Iowa |
| 32 | James Brooks | 20 | Son | Miner | Iowa |
| 33 | Laura H. Brooks | 17 | Daughter | — | Iowa |
| 34 | Mary Brooks THIS PERSON | 16 | Daughter | — | Iowa |
| 35 | William Brooks | 13 | Son | — | Iowa |
| 36 | Beulah Brooks | 12 | Daughter | — | Iowa |
| 37 | Dorothy Brooks | 11 | Daughter | — | Iowa |
| 38 | Mildred Brooks | 9 | Daughter | — | Iowa |
| 39 | Philly Brooks | 5 | Son | — | Iowa |
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)