RP
Robert Peterson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Lake-County, Illinois
Our Model Tree links this Robert Peterson across the 1920, 1930 and 1940 US Censuses in Lake-County, Illinois (XGBoost, ~Confirmed), with identified parents Robert & Robert — first a son (b.~1918), then head of a 5-person household.
Age 22
b. ~1918
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lake-County, Illinois |
| Surname | Peterson |
| Given Name | Robert Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Winthrop Harbor Village |
| 1935 Residence (County) | Lake |
| Additional Details | |
| Occupation | Laborer |
| Industry | Ready-mix Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Laborer |
| Township / Ward | Winthrop Harbor Village |
| Est. Birth Year | ~1918 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Irene Peterson | Daughter | — | 19 | ~1921 |
| Robert Peterson | Head | — | 46 | ~1894 |
| Robert Peterson | Son | — | 22 | ~1918 |
| Howard Peterson | Son | — | 17 | ~1923 |
| Caroline Peterson | Spouse | — | 42 | ~1898 |
Census Appearances
1920
Lake, Illinois
Son, age 2
Lake, Illinois · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Petersen |
| Given Name | Robert W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | New York |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Lake, Illinois
Son, age 12
Lake, Illinois · implied b. ~1918 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Robert M. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | New York |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Lake-County, Illinois
Son, age 22
Lake-County, Illinois · implied b. ~1918 — 5 household members
| Surname | Peterson |
| Given Name | Robert Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Winthrop Harbor Village |
| 1935 Residence (County) | Lake |
| Occupation | Laborer |
| Industry | Ready-mix Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| 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 Peterson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Robert Peterson (~0.92 confidence) and father Robert Peterson (~0.92 confidence) and father Robert Petersen (~0.92 confidence) and mother Caroline Petersen (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Robert Peterson
b. ~1894
Source father
● Household
· direct · ~0.92
Father
Robert Peterson
b. ~1894
Source father
● Household
· direct · ~0.92
Father
Robert Petersen
b. ~1894
Source father
● Household
· direct · ~0.92
Mother
Caroline Petersen
b. ~1898
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Peterson
Son · 1940 · age 22 · b. ~1918 · Illinois
★ You are viewing this record
Sibling
Irene Peterson
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Howard Peterson
Sibling · 1940 · age 17
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 — Lake-County, Illinois
Open full size
1940 US Federal Census — Lake-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00828-00178)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Donna Woodham | 1 | Daughter | — | Wisconsin |
| 2 | Frank Leginski | 36 | Head | Laborer | Illinois |
| 3 | Josephine Leginski | 27 | Wife | — | Illinois |
| 4 | Barbara Leginski | 2 | Daughter | — | Illinois |
| 5 | Donna Leginski | 1 | Daughter | — | Illinois |
| 6 | Lars Bergen | 57 | Head | Treasure | Norway |
| 7 | Hildur Bergen | 63 | Wife | — | Norway |
| 8 | Astrid Bergen | 33 | Daughter | Teacher | Illinois |
| 9 | Harold Bergen | 30 | Son | Engineer | Illinois |
| 10 | Richard Owens | 55 | Head | Laborer | England |
| 11 | Stanley Polenny | 28 | Head | Laborer | Wisconsin |
| 12 | Bernice Polenny | 22 | Wife | — | Wisconsin |
| 13 | Son Polenny | 4 | Son | — | Wisconsin |
| 14 | Herbert Raduechel | 44 | Head | Machinist | Wisconsin |
| 15 | Mary Raduechel | 36 | Wife | — | Illinois |
| 16 | Herbert Jr. Raduechel | 9 | Son | — | Illinois |
| 17 | Robert Raduechel | 6 | Son | — | Illinois |
| 18 | Ronald Raduechel | 0 | Son | — | Illinois |
| 19 | Mary Ann Raduechel | 0 | Daughter | — | Illinois |
| 20 | John Matlow | 49 | Head | Commissioner | Same |
| 21 | Gladys Matlow | 43 | Wife | — | Same |
| 22 | Howard Matlow | 19 | Son | — | Same |
| 23 | Harry Matlow | 14 | Son | — | Same |
| 24 | Anna Harker | 70 | Head | — | Wisconsin |
| 25 | Lloyd Harker | 38 | Son | Bartender | Wisconsin |
| 26 | Fred Gestila | 33 | Head | Traffic Clerk | Michigan |
| 27 | Elsie Gestila | 30 | Wife | — | Illinois |
| 28 | Richard Gestila | 9 | Son | — | Illinois |
| 29 | Donna Gestila | 5 | Daughter | — | Illinois |
| 30 | Margery Gestila | 2 | Daughter | — | Illinois |
| 31 | William Norberg | 70 | Father-in-law | Tool Maker | Sweden |
| 32 | Robert Peterson | 46 | Head | Salesman | Illinois |
| 33 | Caroline Peterson | 42 | Wife | — | New York |
| 34 | Robert Jr. Peterson THIS PERSON | 22 | Son | Laborer | Illinois |
| 35 | Irene Peterson | 19 | Daughter | Laborer | Illinois |
| 36 | Howard Peterson | 17 | Son | — | Illinois |
| 37 | Otto Martin | 45 | Head | Machinist | Wisconsin |
| 38 | Elvera Martin | 42 | Wife | — | Wisconsin |
| 39 | Marion Martin | 21 | Daughter | Stenographer | Wisconsin |
| 40 | Dorothy Martin | 14 | Daughter | — | Illinois |
Pedigree Summary
Robert + 2 siblings
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)