MJ
Martin Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Martin Johnson across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Martin & Carl — first a son (b.~1915), then head of a 6-person household.
Age 25
b. ~1915
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Johnson |
| Given Name | Martin J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Wilmette Village |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Chemical Engineer |
| Industry | Gasoline Co. |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1200 |
| Highest Grade | C 4 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Chemical Engineer |
| Township / Ward | Wilmette Village |
| Est. Birth Year | ~1915 |
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 Martin | Age | Birth yr |
|---|---|---|---|---|
| Martin Johnson | Head | — | 55 | ~1885 |
| Anna Ott | Other | — | 42 | ~1898 |
| Caroline Johnson | Other | — | 90 | ~1850 |
| Richard Johnson | Son | — | 21 | ~1919 |
| Martin Johnson | Son | — | 25 | ~1915 |
| Elizabeth Johnson | Spouse | — | 51 | ~1889 |
Census Appearances
1920
Cook, Illinois
Son, age 6
Cook, Illinois · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Martin |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| 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 16
Cook, Illinois · implied b. ~1914 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Martin |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| 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 25
Cook-County, Illinois · implied b. ~1915 — 6 household members
| Surname | Johnson |
| Given Name | Martin J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Wilmette Village |
| 1935 Residence (County) | Cook |
| Occupation | Chemical Engineer |
| Industry | Gasoline Co. |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1200 |
| Highest Grade | C 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 Martin Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Martin Johnson (~0.92 confidence) and father Carl Johnson (~0.92 confidence) and father Oscar Johnson (~0.92 confidence) and mother Elizabeth Johnson (~0.92 confidence) and mother Hilda Johnson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Martin Johnson
b. ~1885
Source father
● Household
· direct · ~0.92
Father
Carl Johnson
b. ~1887
Source father
● Household
· direct · ~0.92
Father
Oscar Johnson
b. ~1888
Source father
● Household
· direct · ~0.92
Mother
Elizabeth Johnson
b. ~1889
Source mother
● Household
· direct · ~0.92
Mother
Hilda Johnson
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Martin Johnson
Son · 1940 · age 25 · b. ~1915 · Illinois
★ You are viewing this record
Sibling
Richard Johnson
Sibling · 1940 · age 21
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-t0627-00782-00856)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Herbert D. Collyer | 48 | Head | Broker | Iowa |
| 2 | Elizabeth D. Collyer | 41 | Wife | — | New Jersey |
| 3 | Herbert D. Jr. Collyer | 20 | Son | — | Missouri |
| 4 | William A. Collyer | 15 | Son | — | New York |
| 5 | Theodore J. Collyer | 14 | Son | — | New York |
| 6 | Victor B. Collyer | 12 | Son | — | New York |
| 7 | Colletta E. Collyer | 11 | Daughter | — | New York |
| 8 | Lolita Collyer | 5 | Daughter | — | New York |
| 9 | James D. Fitch | 64 | Head | Sales Manager | Illinois |
| 10 | Eula V. Fitch | 51 | Wife | — | Georgia |
| 11 | Mary D. Fitch | 25 | Daughter | Personnel Dept. | Georgia |
| 12 | Carl J. Zipprich | 50 | Head | Proprietor | Illinois |
| 13 | Mary M. Zipprich | 48 | Wife | — | Illinois |
| 14 | John C. Zipprich | 27 | Son | Owner | Illinois |
| 15 | James C. Zipprich | 12 | Son | — | Illinois |
| 16 | William King | 64 | Head | Salesman | Illinois |
| 17 | Mabel D. King | 59 | Wife | — | Illinois |
| 18 | William Rudd | 88 | Mother | — | Wisconsin |
| 19 | Irma Sunstrom | 32 | Servant | Servant | Sweden |
| 20 | Wallace W. Miller | 62 | Head | — | Ohio |
| 21 | George K. Miller | 52 | Wife | — | Illinois |
| 22 | Jean J. Miller | 19 | Daughter | — | Illinois |
| 23 | George W. Miller | 16 | Son | — | Illinois |
| 24 | Ove Carlson | 41 | Servant | Servant | Denmark |
| 25 | Anna Carlson | 27 | Servant | Servant | Norway |
| 26 | J. Edward Riess | 64 | Head | President | Illinois |
| 27 | Evelyn Riess | 45 | Wife | — | Illinois |
| 28 | Robert W. Riess | 19 | Son | — | Illinois |
| 29 | Virginia A. Riess | 17 | Daughter | — | Illinois |
| 30 | Eretra Riess | None | — | — | — |
| 31 | Milton Handelman | 28 | Head | Merchandise Manager | Illinois |
| 32 | Frances Handelman | 27 | Wife | — | Illinois |
| 33 | Simon Handelman | 3 | Son | — | Illinois |
| 34 | Martin A. Johnson | 55 | Head | Broker | Illinois |
| 35 | Elizabeth C. Johnson | 51 | Wife | — | Illinois |
| 36 | Martin J. Johnson THIS PERSON | 25 | Son | Chemical Engineer | Illinois |
| 37 | Richard Johnson | 21 | Son | — | Illinois |
| 38 | Caroline Johnson | 90 | Mother | — | Norway |
| 39 | Anna Ott | 42 | Servant | Servant | Germany |
| 40 | Robert Hvid | 56 | Head | Maintenance Engineer | Denmark |
Pedigree Summary
Martin + 1 sibling
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)