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Jack Brown — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this Jack Brown across the 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1930), then head of a 9-person household.
Age 10
b. ~1930
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Brown |
| Given Name | Jack |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Industry | 0 |
| Class of Worker | 0 |
| Highest Grade | 5 |
| 1935 Residence | Same Place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1930 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Jack | Age | Birth yr |
|---|---|---|---|---|
| Gretchen Brown | Daughter | — | 25 | ~1915 |
| Velma Dilley | Daughter | — | 18 | ~1922 |
| Mary Mcnair | Daughter | — | 19 | ~1921 |
| Early Brown | Head | — | 37 | ~1903 |
| Diane Dilley | Other | — | 1 | ~1939 |
| Raymond Dilley | Other | — | 19 | ~1921 |
| Clark Mcnair | Other | — | 23 | ~1917 |
| Jack Brown | Son | — | 10 | ~1930 |
| Edith Brown | Spouse | — | 34 | ~1906 |
Census Appearances
1930
Polk, Iowa
Son, age 1
Polk, Iowa · implied b. ~1929 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brown |
| Given Name | Jack |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Son, age 10
Polk-County, Iowa · implied b. ~1930 — 9 household members
| Surname | Brown |
| Given Name | Jack |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Industry | 0 |
| Class of Worker | 0 |
| Highest Grade | 5 |
| 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 Jack Brown across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Jack Brown
Son · 1940 · age 10 · b. ~1930 · Iowa
★ You are viewing this record
Sibling
Gretchen Brown
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mcnair
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Velma Dilley
Sibling · 1940 · age 18
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
40 people indexed on this census page (nara:1940:m-t0627-01197-00603)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | June Forbes | 9 | Daughter | — | Iowa |
| 42 | Dora Van Vranken | 58 | Head | Stenographer | New Jersey |
| 43 | Phoebe Harkness | 58 | Boarder | Laborer | Nebraska |
| 44 | — | None | — | — | — |
| 45 | Edward A. Short | 43 | Head | Signal Maintenance | Iowa |
| 46 | Kathryn Short | 30 | Wife | — | Iowa |
| 47 | Marilyn Short | 8 | Daughter | — | Iowa |
| 48 | Larry Short | 6 | Son | — | Iowa |
| 49 | Early J. Brown | 37 | Head | Engineer | Iowa |
| 50 | Edith Brown | 34 | Wife | — | Iowa |
| 51 | Gretchen Brown | 25 | Daughter | — | Iowa |
| 52 | Jack Brown THIS PERSON | 10 | Son | — | Iowa |
| 53 | Clark Mcnair | 23 | Son-in-law | Salesman | Iowa |
| 54 | Mary Ellen Mcnair | 19 | Daughter | Saleswoman | Iowa |
| 55 | Raymond Dilley | 19 | Son-in-law | Salesman | Iowa |
| 56 | Velma Dilley | 18 | Daughter | Saleswoman | Iowa |
| 57 | Diane Dilley | 1 | Grand Daughter | — | Iowa |
| 58 | Oscar M. Bell | 52 | Head | Train Dispatcher | Iowa |
| 59 | Jessie L. Bell | 46 | Wife | — | Iowa |
| 60 | Robert John Bell | 19 | Son | Apprentice | Iowa |
| 61 | Thomas Hall | 64 | Head | Miner | England |
| 62 | Eliza Hall | 61 | Wife | — | England |
| 63 | Doris Hall | 28 | Daughter | Typist | Iowa |
| 64 | Thomas Jr. Hall | 26 | Son | Appraiser | Iowa |
| 65 | George Ostrander | 48 | Head | Car Inspector | Kansas |
| 66 | Bessie Ostrander | 44 | Wife | — | Kansas |
| 67 | Vernon Ostrander | 22 | Son | Laborer | Iowa |
| 68 | Mary Ostrander | 20 | Daughter | Typist | Iowa |
| 69 | Rachel Ostrander | 18 | Daughter | Typist | Iowa |
| 70 | Marjorie Ostrander | 15 | Daughter | — | Iowa |
| 71 | James Ostrander | 12 | Son | — | Iowa |
| 72 | Jack Ostrander | 9 | Son | — | Iowa |
| 73 | Bobbie Ostrander | 6 | Son | — | Iowa |
| 74 | Ronald Ostrander | 3 | Son | — | Iowa |
| 75 | — | None | — | — | — |
| 76 | Walter Acuff | 30 | Head | Teller | Iowa |
| 77 | Ruth Acuff | 31 | Wife | — | Iowa |
| 78 | Joyce Ann Acuff | 7 | Daughter | — | Iowa |
| 79 | Clare Meston | 26 | Head | Salesman | Iowa |
| 80 | Polly Meston | 28 | Wife | File Clerk | Iowa |
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)