EP
Elmer Peterson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Elmer Peterson across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Andrew & Arthur — first a son (b.~1892), then head of a 3-person household.
Age 48
b. ~1892
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Peterson |
| Given Name | Elmer |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | motor-man |
| Industry | street railway |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1800 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Motor-Man |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1892 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Elmer | Age | Birth yr |
|---|---|---|---|---|
| Elmer Peterson | Son | — | 48 | ~1892 |
| Caroline Peterson | Head | — | 76 | ~1864 |
| Arthur Peterson | Son | — | 52 | ~1888 |
Census Appearances
1920
Cook, Illinois
Son, age 27
Cook, Illinois · implied b. ~1893 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Elmer O |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Electrician |
| Industry | Ship yards |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 37
Cook, Illinois · implied b. ~1893 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Elmer |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Electrician |
| Industry | Power Plant |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 48
Cook-County, Illinois · implied b. ~1892 — 3 household members
| Surname | Peterson |
| Given Name | Elmer |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | motor-man |
| Industry | street railway |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1800 |
| Highest Grade | No 8 |
| 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 Elmer Peterson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Andrew Peterson (~0.92 confidence) and father Arthur Peterson (~0.92 confidence) and mother Caroline Peterson (~0.92 confidence) and mother Ida Peterson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Andrew Peterson
b. ~1860
Source father
● Household
· direct · ~0.92
Father
Arthur Peterson
b. ~1860
Source father
● Household
· direct · ~0.92
Mother
Caroline Peterson
b. ~1864
Source mother
● Household
· direct · ~0.92
Mother
Ida Peterson
b. ~1863
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Elmer Peterson
Son · 1940 · age 48 · b. ~1892 · Illinois
★ You are viewing this record
Sibling
Arthur Peterson
Sibling · 1940 · age 52
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
40 people indexed on this census page (nara:1940:m-t0627-00989-00274)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Rose Marie Jacobsen | 50 | daughter | Operator | Illinois |
| 42 | Karl Miller | 65 | head | Cabinet Maker | Sweden |
| 43 | Agnes Miller | 55 | wife | — | Sweden |
| 44 | Catherine Holgerson | 33 | daughter | General Office Work | Iowa |
| 45 | Edward Cowen | 42 | head | General Office Work | Pennsylvania |
| 46 | Jennie Cowen | 43 | wife | — | Illinois |
| 47 | Edwin Cowen | 19 | daughter | Office Boy | Illinois |
| 48 | Jean Cowen | 15 | son | — | Illinois |
| 49 | Arthur Kozakiewicz | 23 | head | Machinist | Illinois |
| 50 | Irene Kozakiewicz | 19 | wife | — | Illinois |
| 51 | Oda Nielsen | 44 | head | — | Denmark |
| 52 | Betty Nielsen | 7 | daughter | — | Illinois |
| 53 | Herman Paulsen | 36 | lodger | Cabinet Maker | New York |
| 54 | Caroline Peterson | 76 | head | — | Sweden |
| 55 | Arthur Peterson | 52 | son | Mail Carrier | Illinois |
| 56 | Elmer Peterson THIS PERSON | 48 | son | Motor-Man | Illinois |
| 57 | Elmer Anderson | 49 | head | Hook-Keeper | Illinois |
| 58 | Myrtle Anderson | 45 | wife | Secretary | Illinois |
| 59 | Virginia Anderson | 18 | daughter | — | Illinois |
| 60 | Marjorie Anderson | 15 | daughter | — | Illinois |
| 61 | Charles Mccleary | 55 | head | Laboratory Asst. | Ohio |
| 62 | Lillian Mccleary | 44 | wife | — | Illinois |
| 63 | Le Moyne Mccleary | 23 | son | General Office Work | Illinois |
| 64 | R. Donald Mccleary | 20 | son | — | Illinois |
| 65 | Lorraine Mccleary | 18 | daughter | — | Illinois |
| 66 | Janice Mccleary | 15 | daughter | — | Illinois |
| 67 | Robert Mccleary | 13 | son | — | Illinois |
| 68 | Kenneth Mccleary | 6 | son | — | Illinois |
| 69 | Margaret Mccleary | 4 | daughter | — | Illinois |
| 70 | W. Philip Mantone | 24 | head | General Maintenance | Missouri |
| 71 | Frances Mantone | 24 | daughter | — | Tennessee |
| 72 | Caroline Tennick | 85 | head | — | Norway |
| 73 | Alwin Tennick | 47 | son | Cotton Filler | Illinois |
| 74 | Albert Holmberg | 53 | head | Auto-Mechanic | Illinois |
| 75 | Jennie Holmberg | 48 | wife | — | Illinois |
| 76 | Alberta Holmberg | 12 | daughter | — | Illinois |
| 77 | Anna Nelson | 53 | head | — | Sweden |
| 78 | Violet Nelson | 15 | daughter | — | Illinois |
| 79 | Paul Straub | 54 | head | Bottler | Roumania |
| 80 | Katherine Straub | 53 | wife | — | Roumania |
Related Census Records
Pedigree Summary
Elmer + 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)