RB
Robert Brown — 1940 US Census Record
Model Tree available1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this Robert Brown across the 1920, 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed), with identified parents Thomas & Thomas — first a son (b.~1912), then head of a 4-person household.
Age 28
b. ~1912
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Brown |
| Given Name | Robert L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Occupation | Police |
| Industry | State |
| Class of Worker | GW |
| Hours Worked | 60 |
| Income (1939) | 1500 |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Police |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1912 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Thomas Brown | Head | — | 21 | ~1919 |
| Eugene Brown | Son | — | 35 | ~1905 |
| Robert Brown | Son | — | 28 | ~1912 |
| Lenora Brown | Spouse | — | 64 | ~1876 |
Census Appearances
1920
Polk, Iowa
Son, age 8
Polk, Iowa · implied b. ~1912 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brown |
| Given Name | Robert J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | New York |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Polk, Iowa
Son, age 18
Polk, Iowa · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brown |
| Given Name | Robert J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | New York |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Son, age 28
Polk-County, Iowa · implied b. ~1912 — 4 household members
| Surname | Brown |
| Given Name | Robert L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Occupation | Police |
| Industry | State |
| Class of Worker | GW |
| Hours Worked | 60 |
| Income (1939) | 1500 |
| Highest Grade | H-4 |
| 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 Robert Brown across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Thomas Brown (~0.92 confidence) and father Thomas Brown (~0.50 confidence) and father Thomas Brown (~0.92 confidence) and mother Lenora Brown (~0.92 confidence) and mother Lenora Brown (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.84
Father
Thomas Brown
b. ~1869
Source father
● Household
· direct · ~0.92
Father
Thomas Brown
b. ~1919
Source father
● Household
· direct · ~0.5
Father
Thomas Brown
b. ~1869
Source father
● Household
· direct · ~0.92
Mother
Lenora Brown
b. ~1876
Source mother
● Household
· direct · ~0.92
Mother
Lenora Brown
b. ~1875
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Brown
Son · 1940 · age 28 · b. ~1912 · Iowa
★ You are viewing this record
Sibling
Eugene Brown
Sibling · 1940 · age 35
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-t0627-01193-00670)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Gail B. Loonan | 27 | Wife | — | Iowa |
| 2 | Thomas H. Brown | 21 | Head | — | New York |
| 3 | Lenora M. Brown | 64 | Wife | — | Iowa |
| 4 | Eugene J. Brown | 35 | Son | Engineer | Iowa |
| 5 | Robert L. Brown THIS PERSON | 28 | Son | Police | Iowa |
| 6 | Hollis H. Jay | 33 | Head | Engineer | Iowa |
| 7 | Gladys A. Jay | 28 | Wife | — | Iowa |
| 8 | Fred M. Laimbeer | 45 | Head | Cashier | Iowa |
| 9 | Neva Laimbeer | 46 | Wife | — | Iowa |
| 10 | John M. Laimbeer | 19 | Son | Page Boy | Iowa |
| 11 | Jane N. Laimbeer | 11 | Daughter | — | Iowa |
| 12 | Joan J. Laimbeer | 9 | Daughter | — | Iowa |
| 13 | Olive Josselyn | 42 | Sister in L | — | Kansas |
| 14 | Eva M. Bohartson | 22 | Lodger | Beauty Oper | Iowa |
| 15 | Ellis M. Knapp | 32 | Head | Office Mgr. | Iowa |
| 16 | Violet D. Knapp | 25 | Wife | — | Missouri |
| 17 | Richard E. Knapp | 4 | Son | — | Iowa |
| 18 | George W. Gnall | 55 | Head | Superintendent | Pennsylvania |
| 19 | Eunice P. Gnall | 43 | Wife | — | Virginia |
| 20 | Charlotte P. Gnall | 20 | Daughter | Office Asst. | Iowa |
| 21 | George W. Gnall | 18 | Son | Helper | Alabama |
| 22 | Edward C. Bucknell | 34 | Head | Warehouseman | Iowa |
| 23 | Pauline Bucknell | 36 | Wife | Waitress | Iowa |
| 24 | Gloria L. Bucknell | 15 | Daughter | Waitress | Iowa |
| 25 | Chester Jr. Bucknell | 13 | Son | — | Iowa |
| 26 | Frank C. Stevens | 71 | Head | — | Illinois |
| 27 | Blanche A. Calvin | 49 | Sister | — | Iowa |
| 28 | George Yates | 49 | Head | Photographer | England |
| 29 | Nancy Yates | 49 | Wife | — | Indiana |
| 30 | Patricia Yates | 19 | Daughter | — | Iowa |
| 31 | Chester J. Dye | 42 | Head | District Mgr | Ohio |
| 32 | Vivian J. Dye | 38 | Wife | — | Missouri |
| 33 | Joan F. Dye | 16 | Daughter | — | South Dakota |
| 34 | Shirley J. Dye | 14 | Daughter | — | North Dakota |
| 35 | Robert P. Mcgovern | 42 | Head | Traveling Salesman | Minnesota |
| 36 | Jeanette C. Mcgovern | 42 | Wife | — | Minnesota |
| 37 | Terrence V. Mcgovern | 15 | Son | — | Iowa |
| 38 | Asley J. Hanson | 45 | Head | Secy. | Wisconsin |
| 39 | Marguerite Hanson | 45 | Wife | — | Ohio |
| 40 | Marguerite M. Hanson | 18 | Daughter | — | Iowa |
Pedigree Summary
Robert + 1 sibling
Gen 1 · 5 parents
~0.84
Max depth 4 (1900–1950 window)
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)