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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.~1922), then head of a 7-person household.
Age 18
b. ~1922
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Brown |
| Given Name | Jack, M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines city |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Occupation | New Worker |
| Class of Worker | PW |
| Hours Worked | 68 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | New Worker |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1922 |
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 Jack | Age | Birth yr |
|---|---|---|---|---|
| Lois Brown | Daughter | — | 3 | ~1937 |
| Barbara Brown | Daughter | — | 11 | ~1929 |
| Marjorie Brown | Daughter | — | 15 | ~1925 |
| Flora Brown | Head | — | 39 | ~1901 |
| Lowell Brown | Son | — | 3 | ~1937 |
| Jack Brown | Son | — | 18 | ~1922 |
| Ethel Brown | Spouse | — | 41 | ~1899 |
Census Appearances
1930
Polk, Iowa
Son, age 8
Polk, Iowa · implied b. ~1922 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brown |
| Given Name | Jack M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Son, age 18
Polk-County, Iowa · implied b. ~1922 — 7 household members
| Surname | Brown |
| Given Name | Jack, M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines city |
| 1935 Residence (County) | Polk |
| Occupation | New Worker |
| Class of Worker | PW |
| Hours Worked | 68 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| 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 18 · b. ~1922 · Iowa
★ You are viewing this record
Sibling
Barbara Brown
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lowell Brown
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lois Brown
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marjorie Brown
Sibling · 1940 · age 15
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
38 people indexed on this census page (nara:1940:m-t0627-01197-00390)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | James, W. Bunce | 28 | Head | Mechanic | Iowa |
| 2 | Pauline, B. Bunce | 25 | Wife | — | Iowa |
| 3 | Mary, E. Baker | 52 | Mother in law | — | Iowa |
| 4 | Nolan, R. Brown | 33 | Head | Truck Driver | Missouri |
| 5 | Frances, L. Brown | 22 | Wife | — | Iowa |
| 6 | Lolan, F. Brown | 3 | Son | — | Iowa |
| 7 | Judith, A. Brown | 1 | Daughter | — | Iowa |
| 8 | Lowell, D. Brown | 33 | Head | Truck Driver | Missouri |
| 9 | Bernadine, M. Brown | 33 | Wife | Nurse | Iowa |
| 10 | Walter, W. Moore | 32 | Head | Welder | Missouri |
| 11 | Lois, L. Moore | 32 | Wife | Book Binder | Iowa |
| 12 | Herman, C. Jr. Hansen | 19 | Head | Butcher | Iowa |
| 13 | Vera, M. Hansen | 18 | Wife | — | Iowa |
| 14 | Eugene, K. Hansen | 0 | Son | — | Iowa |
| 15 | Flora, F. Brown | 39 | Head | Truck Driver | Missouri |
| 16 | Ethel, H. Brown | 41 | Wife | — | Iowa |
| 17 | Jack, M. Brown THIS PERSON | 18 | Son | New Worker | Iowa |
| 18 | Marjorie, L. Brown | 15 | Daughter | — | Iowa |
| 19 | Barbara, J. Brown | 11 | Daughter | — | Iowa |
| 20 | Lois, E. Brown | 3 | Daughter | — | Iowa |
| 21 | Lowell, F. Brown | 3 | Son | — | Iowa |
| 22 | Clinton, S. Hiatt | 33 | Head | Glazier | Iowa |
| 23 | Mary, A. Hiatt | 32 | Wife | — | Iowa |
| 24 | Helen, I. Hiatt | 13 | Daughter | — | Iowa |
| 25 | Dorothy, M. Hiatt | 11 | Daughter | — | Iowa |
| 26 | Robert, S. Hiatt | 10 | Son | — | Iowa |
| 27 | Arlean, V. Hiatt | 9 | Daughter | — | Iowa |
| 28 | Joseph, J. Hiatt | 5 | Son | — | Iowa |
| 30 | Clayton, G. Fritz | 28 | Head | Painter | Iowa |
| 31 | Ruby, R. Fritz | 29 | Wife | — | Iowa |
| 33 | Randolph, G. Gore | 31 | Head | Laborer | Iowa |
| 34 | Daisy, B. Gore | 30 | Wife | Seamstress | Iowa |
| 35 | Jean, R. Gore | 9 | Son | — | Iowa |
| 36 | Jean, I. Thompson | 32 | Head | Typist | Iowa |
| 37 | Edward, K. Thompson | 6 | Son | — | Iowa |
| 38 | Marjorie Quarton | 24 | Servant | Maid | Iowa |
| 39 | Woodrow, V. Granger | 25 | Head | Truck Driver | Iowa |
| 40 | Florence, M. Granger | 23 | Wife | — | 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)