MC
Mary Cox — 1940 US Census Record
Model Tree available1940 United States Federal Census · Dubuque-County, Iowa
Our Model Tree links this Mary Cox across the 1920, 1930 and 1940 US Censuses in Dubuque-County, Iowa (XGBoost, ~Confirmed), with identified parents Miles & Joseph — first a daughter (b.~1911), then head of a 8-person household.
Age 29
b. ~1911
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Dubuque-County, Iowa |
| Surname | Cox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Prairie Creek Twp. |
| 1935 Residence (County) | Dubuque |
| Additional Details | |
| Occupation | Rural teacher |
| Industry | public school |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 720 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Rural Teacher |
| Township / Ward | Prairie Creek Twp |
| Est. Birth Year | ~1911 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Hella Cox | Daughter | — | 21 | ~1919 |
| Mary Cox | Daughter | — | 29 | ~1911 |
| Joseph Cox | Head | — | 62 | ~1878 |
| Bert Cox | Son | — | 25 | ~1915 |
| Joseph Cox | Son | — | 26 | ~1914 |
| Louis Cox | Son | — | 28 | ~1912 |
| John Cox | Son | — | 30 | ~1910 |
| Catherine Cox | Spouse | — | 61 | ~1879 |
Census Appearances
1920
Dubuque, Iowa
Daughter, age 9
Dubuque, Iowa · implied b. ~1911 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Dubuque, Iowa
Daughter, age 18
Dubuque, Iowa · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Mary M |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Telephone Operator |
| Industry | Telephone Co |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Dubuque-County, Iowa
Daughter, age 29
Dubuque-County, Iowa · implied b. ~1911 — 8 household members
| Surname | Cox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Prairie Creek Twp. |
| 1935 Residence (County) | Dubuque |
| Occupation | Rural teacher |
| Industry | public school |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 720 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Mary Cox across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Miles Cox (~0.92 confidence) and father Joseph Cox (~0.92 confidence) and mother Catherine Cox (~0.92 confidence) and father Joseph Cox (~0.92 confidence) and mother Calista Cox (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Miles Cox
b. ~1877
Source father
● Household
· direct · ~0.92
Father
Joseph Cox
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Catherine Cox
b. ~1879
Source mother
● Household
· direct · ~0.92
Father
Joseph Cox
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Calista Cox
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Cox
Daughter · 1940 · age 29 · b. ~1911 · Iowa
★ You are viewing this record
Sibling
Hella Cox
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Cox
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Louis Cox
Sibling · 1940 · age 28
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Cox
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bert Cox
Sibling · 1940 · age 25
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 — Dubuque-County, Iowa
Open full size
1940 US Federal Census — Dubuque-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01159-00619)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Catherine Kennedy | 78 | Sister | — | New York |
| 2 | Joseph Cox | 62 | Head | Farmer | Iowa |
| 3 | John Cox | 30 | Son | Farm Laborer | Iowa |
| 4 | Mary Cox THIS PERSON | 29 | Daughter | Rural Teacher | Iowa |
| 5 | Louis Cox | 28 | Son | Farm Laborer | Iowa |
| 6 | Joseph Jr. Cox | 26 | Son | Farm Laborer | Iowa |
| 7 | Hella Cox | 21 | Daughter | Beauty Operator | Iowa |
| 8 | Bert Cox | 25 | Son | Farm Laborer | Iowa |
| 9 | Catherine Cox | 61 | Wife | — | Iowa |
| 10 | David Dravel | 41 | Head | Farmer | Iowa |
| 11 | Marcella Dravel | 30 | Wife | — | Jugoslavia |
| 12 | Mary Dravel | 12 | Daughter | — | Iowa |
| 13 | Dorothy Ann Dravel | 11 | Daughter | — | Iowa |
| 14 | Veronica Dravel | 8 | Daughter | — | Iowa |
| 15 | Anthony Dravel | 6 | Son | — | Iowa |
| 16 | Neil Mcquillan | 59 | Head | Farmer | Iowa |
| 17 | Mary Ann Mcquillan | 55 | Wife | — | Iowa |
| 18 | Stella Mcquillan | 22 | Daughter | Rural Teacher | Iowa |
| 19 | Mary Mcquillan | 20 | Daughter | — | Iowa |
| 20 | Joseph Mcquillan | 18 | Son | Farm Laborer | Iowa |
| 21 | Raymond Mcquillan | 15 | Son | — | Iowa |
| 22 | Ignatius Mcquillan | 13 | Son | — | Iowa |
| 23 | Marguerite Mcquillan | 12 | Daughter | — | Iowa |
| 24 | Theresa Mcquillan | 10 | Daughter | — | Iowa |
| 25 | Catherine Mccarthy | 54 | Head | Farmer | Iowa |
| 26 | Lloyd Mccarthy | 26 | Son | Farm Laborer | Iowa |
| 27 | Vern Mccarthy | 30 | Son | Farm Laborer | Iowa |
| 28 | Clifford Mccarthy | 24 | Son | Farm Laborer | Iowa |
| 29 | Rita Mccarthy | 32 | Daughter-in-law | — | Iowa |
| 30 | Patsy Mccarthy | 6 | Granddaughter | — | Iowa |
| 31 | Arlene Mccarthy | 2 | Granddaughter | — | Iowa |
| 32 | Ardella Mccarthy | 27 | Daughter | Rural Teacher | Iowa |
| 33 | Lucille Mccarthy | 20 | Daughter | Rural Teacher | Iowa |
| 34 | Nicholas Kent | 64 | Head | Farmer | Iowa |
| 35 | Mary Kent | 51 | Wife | — | Iowa |
| 36 | Loretta Kent | 31 | Daughter | — | Iowa |
| 37 | Dorothy Kent | 13 | Daughter | — | Iowa |
| 38 | Austin Hentges | 29 | Son-in-law | Trucker | Iowa |
| 39 | La Verne Hentges | 23 | Daughter | — | Iowa |
| 40 | Carl Hentges | 4 | Grandson | — | Iowa |
Pedigree Summary
Mary + 5 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)