RM
Robert Montgomery — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Robert Montgomery across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1917), then head of a 6-person household.
Age 23
b. ~1917
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Montgomery |
| Given Name | Robert C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Office Clerk |
| Industry | Real Estate Company |
| Class of Worker | PW |
| Hours Worked | 17 |
| Income (1939) | 1100 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Office Clerk |
| Township / Ward | Chicago |
| Est. Birth Year | ~1917 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Geraldine Montgomery | Daughter | — | 20 | ~1920 |
| Margaret Montgomery | Daughter | — | 6 | ~1934 |
| John Montgomery | Head | — | 54 | ~1886 |
| Robert Montgomery | Son | — | 23 | ~1917 |
| William Montgomery | Son | — | 14 | ~1926 |
| Elizabeth Montgomery | Spouse | — | 41 | ~1899 |
Census Appearances
1920
Cook, Illinois
Son, age 3
Cook, Illinois · implied b. ~1917 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Montgomery |
| Given Name | Robert C |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 13
Cook, Illinois · implied b. ~1917 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Montgomery |
| Given Name | Robert C |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 23
Cook-County, Illinois · implied b. ~1917 — 6 household members
| Surname | Montgomery |
| Given Name | Robert C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Office Clerk |
| Industry | Real Estate Company |
| Class of Worker | PW |
| Hours Worked | 17 |
| Income (1939) | 1100 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Montgomery across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Montgomery (~0.92 confidence) and father John Montgomery (~0.92 confidence) and father John Montgomery (~0.92 confidence) and mother Gerda Montgomery (~0.92 confidence) and mother Elizabeth Montgomery (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Montgomery
b. ~1886
Source father
● Household
· direct · ~0.92
Father
John Montgomery
b. ~1886
Source father
● Household
· direct · ~0.92
Father
John Montgomery
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Gerda Montgomery
b. ~1889
Source mother
● Household
· direct · ~0.92
Mother
Elizabeth Montgomery
b. ~1899
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Montgomery
Son · 1940 · age 23 · b. ~1917 · Illinois
★ You are viewing this record
Sibling
Geraldine Montgomery
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Montgomery
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Montgomery
Sibling · 1940 · age 14
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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01001-00298)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Andrew Bruml | 69 | Head | — | Austria |
| 42 | Antoinette Bruml | 64 | Wife | — | Austria |
| 43 | Josephine Bruml | 39 | Daughter | Wholesale | Austria |
| 44 | John A. Montgomery | 54 | Head | Draper | Illinois |
| 45 | Elizabeth Montgomery | 41 | Wife | — | Maryland |
| 46 | Robert C. Montgomery THIS PERSON | 23 | Son | Office Clerk | Illinois |
| 47 | Geraldine R. Montgomery | 20 | Daughter | Secretarial | Illinois |
| 48 | William Montgomery | 14 | Son | — | Illinois |
| 49 | Margaret Montgomery | 6 | Daughter | — | Illinois |
| 50 | Harry C. Hoff | 59 | Head | Salesman | Illinois |
| 51 | Harry Jr. Hoff | 25 | Son | Salesman | Illinois |
| 52 | Helen Pimperl | 21 | Maid | Maid | Alabama |
| 53 | Lillian Burri | 44 | Housekeeper | Housekeeper | Illinois |
| 55 | Frithioff Anderson | 44 | Head | Baker | Norway |
| 56 | Frida Anderson | 44 | Wife | — | Norway |
| 57 | Raymond Anderson | 11 | Son | — | Illinois |
| 58 | Gottfried Wahlquist | 57 | Head | Paper Cutter | Sweden |
| 59 | Marie Wahlquist | 51 | Wife | — | Sweden |
| 60 | Florence Wahlquist | 22 | Daughter | Machine-Sewer | Illinois |
| 61 | Andrew Ahlberg | 75 | Head | Janitor | Sweden |
| 62 | Anna Ahlberg | 71 | Wife | — | Sweden |
| 63 | Esther Ahlberg | 49 | Daughter | Secretarial | Illinois |
| 64 | Edith Ahlberg | 46 | Daughter | Stenographer | Illinois |
| 65 | Robert Harrison | 34 | Head | Teacher | Nebraska |
| 66 | Margaret Harrison | 31 | Wife | — | Illinois |
| 67 | Robert Jr. Harrison | 8 | Son | — | Illinois |
| 68 | Bert Gustofson | 42 | Head | Painter | Sweden |
| 69 | Margaret Gustofson | 42 | Wife | — | Sweden |
| 70 | Arney Gustofson | 10 | Son | — | Illinois |
| 71 | Shirley Ann Gustofson | 4 | Daughter | — | Illinois |
| 72 | Oscar Noren | 56 | Head | Painter | Sweden |
| 73 | Hilda Noren | 59 | Wife | — | Sweden |
| 74 | Ebert Noren | 25 | Son | Painter | Illinois |
| 75 | June Noren | 19 | Daughter | Secretarial | Illinois |
| 76 | Eric W. Pearson | 48 | Head | Painter | Sweden |
| 77 | Ellen T. Pearson | 44 | Wife | — | Sweden |
| 78 | Norman Pearson | 15 | Son | — | Illinois |
| 79 | Anna Schmit | 68 | Head | — | Illinois |
| 80 | Loretta Schmit | 37 | Daughter | Typist | Illinois |
Pedigree Summary
Robert + 3 siblings
Gen 1 · 5 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)