RB
Robert Brown — 1940 US Census Record
Model Tree available1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this Robert Brown across the 1920, 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed), with identified parents Mortimer & Nellie — first a son (b.~1910), then head of a 4-person household.
Age 30
b. ~1910
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Brown |
| Given Name | Robert M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Additional Details | |
| Occupation | Agent |
| Industry | Insurance |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 274 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Agent |
| Township / Ward | Waterloo City |
| Est. Birth Year | ~1910 |
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 |
|---|---|---|---|---|
| Helene Brown | Daughter | — | 27 | ~1913 |
| Nettie Brown | Head | — | 68 | ~1872 |
| John Kline | Other | — | 95 | ~1845 |
| Robert Brown | Son | — | 30 | ~1910 |
Census Appearances
1920
Black Hawk, …
Son, age 9
Black Hawk, Iowa · implied b. ~1911 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brown |
| Given Name | Robert L |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Illinois |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Black Hawk, …
Son, age 20
Black Hawk, Iowa · implied b. ~1910 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brown |
| Given Name | Robert A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Black-Hawk-County, Iowa
Son, age 30
Black-Hawk-County, Iowa · implied b. ~1910 — 4 household members
| Surname | Brown |
| Given Name | Robert M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Occupation | Agent |
| Industry | Insurance |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 274 |
| Highest Grade | C 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 Mortimer Brown (~0.92 confidence) and mother Nellie Brown (~0.92 confidence) and mother Nellie Brown (~0.92 confidence) and mother Nettie Brown (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Mortimer Brown
b. ~1864
Source father
● Household
· direct · ~0.92
Mother
Nellie Brown
b. ~1872
Source mother
● Household
· direct · ~0.92
Mother
Nellie Brown
b. ~1872
Source mother
● Household
· direct · ~0.92
Mother
Nettie Brown
b. ~1872
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Brown
Son · 1940 · age 30 · b. ~1910 · Iowa
★ You are viewing this record
Sibling
Helene Brown
Sibling · 1940 · age 27
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 — Black-Hawk-County, Iowa
Open full size
1940 US Federal Census — Black-Hawk-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01140-00191)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Claire Burnett | 37 | Wife | — | California |
| 42 | Audrey Burnett | 13 | Daughter | — | California |
| 43 | Samuel Bentley | 71 | Head | Assistant City Clerk | Ohio |
| 44 | Zetta M Bentley | 70 | Wife | — | Iowa |
| 45 | Ada B Hutchings | 77 | Head | — | Iowa |
| 46 | Daisy Makinstie | 61 | Head | — | Pennsylvania |
| 47 | Frank Makinstie | 21 | Head | Engineer | Iowa |
| 48 | Thelma Makinstie | 21 | Wife | — | Iowa |
| 49 | George J Mccleery | 68 | Head | Decorator | Illinois |
| 50 | Mabel Mccleery | 65 | Wife | — | Illinois |
| 51 | Robert Sherburne | 29 | Head | Jeweler | Iowa |
| 52 | Jean Sherburne | 29 | Wife | Music Teacher | Iowa |
| 53 | Miles Murphy | 30 | Head | Salesman | Iowa |
| 54 | Madeline Murphy | 25 | Wife | — | Iowa |
| 55 | Nettie M Brown | 68 | Head | Owner | Illinois |
| 56 | Robert M Brown THIS PERSON | 30 | Son | Agent | Iowa |
| 57 | Helene J Brown | 27 | Daughter | Secretary | Iowa |
| 58 | John Kline | 95 | Father | — | Alsace-Lorraine |
| 59 | Isaac Bussey | 55 | Head | Yard Foreman | Illinois |
| 60 | Effie Bussey | 35 | Wife | — | Kansas |
| 61 | Dorothy Bussey | 17 | Daughter | — | Iowa |
| 62 | Esther M Bussey | 80 | Mother | — | Michigan |
| 63 | Warren Hoffman | 19 | Lodger | Attendant | Iowa |
| 64 | Robert Latt | 35 | Head | Machinist | Iowa |
| 65 | Viola Latt | 32 | Wife | — | Nebraska |
| 66 | June Latt | 9 | Daughter | — | Illinois |
| 67 | Roberta Latt | 7 | Daughter | — | Michigan |
| 68 | Martin G Latt | 5 | Son | — | Iowa |
| 69 | Andrew Jellinger | 51 | Head | Tailor | Denmark |
| 70 | Dorothy Jellinger | 51 | Wife | Alterer | Iowa |
| 71 | Loret Jellinger | 24 | Son | Machinist | Iowa |
| 72 | Jane Jellinger | 21 | Daughter | Driver | Iowa |
| 73 | Andrew C Jellinger | 19 | Son | Stenographer | Iowa |
| 74 | Wanda Ott | 18 | Lodger | Mortgage Co. | Minnesota |
| 75 | Mary Lou Zarley | 20 | Lodger | — | Iowa |
| 76 | Mary Lauritzen | 72 | Head | — | Germany |
| 77 | Mary Lauritzen | 47 | Daughter | Journalist | Iowa |
| 78 | Paul Lauritzen | 22 | Grandson | Assistant Manager | Iowa |
| 79 | Elwood Buckmann | 26 | Head | — | Wisconsin |
| 80 | Mary Buckmann | 24 | Wife | — | Iowa |
Pedigree Summary
Robert + 1 sibling
Gen 1 · 4 parents
~0.92
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)