MC
Margaret Cox — 1940 US Census Record
Model Tree available1940 United States Federal Census · Will-County, Illinois
Our Model Tree links this Margaret Cox across the 1920, 1930 and 1940 US Censuses in Will-County, Illinois (XGBoost, ~Confirmed), with identified parents Arthur & Loretta — first a daughter (b.~1919), then head of a 4-person household.
Age 21
b. ~1919
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Will-County, Illinois |
| Surname | Cox |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Joliet |
| 1935 Residence (County) | Will |
| Additional Details | |
| Occupation | Teacher |
| Industry | Country School |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 349 |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Teacher |
| Township / Ward | Joliet |
| Est. Birth Year | ~1919 |
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 Margaret | Age | Birth yr |
|---|---|---|---|---|
| Loretta Cox | Spouse | — | 45 | ~1895 |
| Arthur Cox | Head | — | 48 | ~1892 |
| Margaret Cox | Daughter | — | 21 | ~1919 |
| Dorothy Cox | Daughter | — | 22 | ~1918 |
Census Appearances
1920
Will, Illinois
Daughter, age
Will, Illinois · implied b. ~1920
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Cox |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Will, Illinois
Daughter, age 10
Will, Illinois · implied b. ~1920 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Margaret C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| 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
Will-County, Illinois
Daughter, age 21
Will-County, Illinois · implied b. ~1919 — 4 household members
| Surname | Cox |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Joliet |
| 1935 Residence (County) | Will |
| Occupation | Teacher |
| Industry | Country School |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 349 |
| Highest Grade | C 2 |
| 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 Margaret Cox across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Arthur Cox (~0.92 confidence) and mother Loretta Cox (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Arthur Cox
b. ~1892
Source father
● Household
· direct · ~0.92
Mother
Loretta Cox
b. ~1895
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Cox
Daughter · 1940 · age 21 · b. ~1919 · Illinois
★ You are viewing this record
Sibling
Dorothy Cox
Sibling · 1940 · age 22
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 — Will-County, Illinois
Open full size
1940 US Federal Census — Will-County, Illinois
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-00909-00033)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Stanley Kozlowski | 62 | Head | Laboring | Poland |
| 42 | Catherine Kozlowski | 52 | Wife | — | Poland |
| 43 | Alvie T. Reed | 41 | Head | Industrial General | Kentucky |
| 44 | Violet Q. Reed | 32 | Wife | — | Illinois |
| 45 | Ronald Reed | 7 | Son | — | Illinois |
| 47 | Walter Mason | 49 | Head | Waiter Dining Car | Illinois |
| 48 | Lillian A. Mason | 50 | Wife | — | Alabama |
| 49 | Christine Mason | 45 | Head | Steam Engineer | Tennessee |
| 50 | Beatrice A. Mason | 32 | Wife | — | Illinois |
| 51 | Henry Walker | 31 | Lodger | Houseman | Texas |
| 52 | Walter Mason | 51 | Head | Decorator | Alabama |
| 53 | Myrtle Q. Mason | 47 | Wife | — | Wisconsin |
| 54 | Joseph Rousey | 52 | Head | Car Repairer | Hungary |
| 55 | Mary Rousey | 45 | Wife | — | Hungary |
| 56 | Goldie Rousey | 14 | Daughter | — | Illinois |
| 57 | Martha Rousey | 5 | Daughter | — | Illinois |
| 58 | Joseph Peressin | 70 | Head | Moulder | Hungary |
| 59 | Rachel Q. Peressin | 60 | Wife | — | Hungary |
| 60 | Mary S. Peressin | 15 | Daughter | Laborer | Illinois |
| 61 | Stephen Peressin | 23 | Son | Laborer | Illinois |
| 63 | Alvin H. Solberg | 53 | Head | Stonecutter | Sweden |
| 64 | Beatrice Solberg | 48 | Wife | — | England |
| 65 | Carl G. Swanson | 29 | Cousin | Operator | Sweden |
| 66 | Florence Swanson | 23 | Daughter | — | Illinois |
| 67 | George Swanson | 18 | Son | — | Illinois |
| 68 | Henry Steffen | 60 | Head | Conductor | Michigan |
| 69 | Sparta Steffen | 50 | Wife | — | Michigan |
| 70 | Jack Steffen | 26 | Son | Call Boy | Michigan |
| 71 | Frederick Steffen | 20 | Son | Asst. Colorman | Michigan |
| 72 | Bernadine Steffen | 20 | Daughter-in-law | — | Illinois |
| 73 | Mary Ellen Steffen | 1 | Granddaughter | — | Illinois |
| 74 | Christina Thomas | 75 | Head | — | Illinois |
| 75 | Elva Q. Thomas | 27 | Daughter | Clerical | Illinois |
| 76 | Ruth Thomas | 35 | Daughter | Clerical | Illinois |
| 77 | Arthur J. Cox | 48 | Head | Maintenance Man | Illinois |
| 78 | Loretta Q. Cox | 45 | Wife | — | Illinois |
| 79 | Dorothy Cox | 22 | Daughter | Laborer | Illinois |
| 80 | Margaret Cox THIS PERSON | 21 | Daughter | Teacher | Illinois |
Pedigree Summary
Margaret + 1 sibling
Gen 1 · 2 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)