MC
Mary Cox — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mercer-County, North Dakota
Our Model Tree links this Mary Cox across the 1920, 1930 and 1940 US Censuses in Mercer-County, North Dakota (XGBoost, ~Confirmed), with identified parents Philip & Christon — first a daughter (b.~1914), then head of a 5-person household.
Age 26
b. ~1914
Female
Daughter
Born: Scotland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, North Dakota |
| Surname | Cox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Scotland |
| 1935 Residence (City) | T 144 R 88 |
| 1935 Residence (County) | Mercer |
| Naturalization Status | First papers filed |
| Additional Details | |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Township / Ward | T 144 R 88 |
| Est. Birth Year | ~1914 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Catherine Cox | Daughter | — | 18 | ~1922 |
| Mary Cox | Daughter | — | 26 | ~1914 |
| Christopher Cox | Head | — | 56 | ~1884 |
| Patrick Cox | Son | — | 20 | ~1920 |
| Mary Cox | Spouse | — | 55 | ~1885 |
Census Appearances
1920
Mercer, North …
Daughter, age 7
Mercer, North Dakota · implied b. ~1913 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Scotland |
| Naturalization Status | Alien |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1930
Mercer, North …
Daughter, age 17
Mercer, North Dakota · implied b. ~1913 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1916 |
| Father's Birthplace | N. Ireland |
| Mother's Birthplace | Scotland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Mercer-County, North …
Daughter, age 26
Mercer-County, North Dakota · implied b. ~1914 — 5 household members
| Surname | Cox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Scotland |
| 1935 Residence (City) | T 144 R 88 |
| 1935 Residence (County) | Mercer |
| Naturalization Status | First papers filed |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 Philip Cox (~0.92 confidence) and father Christon Cox (~0.92 confidence) and father Christopher Cox (~0.92 confidence) and mother Mary Cox (~0.92 confidence) and mother Mary Cox (~0.92 confidence) and mother Mary Cox (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Philip Cox
b. ~1883
Source father
● Household
· direct · ~0.92
Father
Christon Cox
b. ~1884
Source father
● Household
· direct · ~0.92
Father
Christopher Cox
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Mary Cox
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Mary Cox
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Mary Cox
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Cox
Daughter · 1940 · age 26 · b. ~1914 · North Dakota
★ You are viewing this record
Sibling
Catherine Cox
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Cox
Sibling · 1940 · age 20
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 — Mercer-County, North Dakota
Open full size
1940 US Federal Census — Mercer-County, North Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03007-00187)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Anna Schmautz | 30 | Head | — | N. Dakota |
| 42 | Marvin Schmautz | 9 | Son | — | N. Dakota |
| 43 | Rueben Schmautz | 6 | Son | — | N. Dakota |
| 44 | Arlene Schmautz | 4 | Daughter | — | N. Dakota |
| 45 | Emil Herman | 30 | Head | Carpenter | S. Dakota |
| 46 | Eleanor Herman | 28 | Wife | — | S. Dakota |
| 47 | Lee E. Sterkins | 54 | Head | Foreman | Wisconsin |
| 48 | Emma Sterkins | 33 | Wife | — | N. Dakota |
| 49 | Ann Sterkins | 10 | Daughter | — | N. Dakota |
| 50 | Christopher Cox | 56 | Head | Common Laborer | Ind. Free State |
| 51 | Mary Cox | 55 | Wife | — | Ind. Free State |
| 52 | Mary Cox THIS PERSON | 26 | Daughter | — | Scotland |
| 53 | Patrick B. Cox | 20 | Son | Laborer | N. Dakota |
| 54 | Catherine Cox | 18 | Daughter | New Worker | N. Dakota |
| 55 | E. Ronald Johnson | 23 | Head | Electrician | N. Dakota |
| 56 | Frieda Rust | 32 | Head | — | N. Dakota |
| 57 | Arthur Rust | 14 | Son | — | N. Dakota |
| 58 | Norma Rust | 10 | Daughter | — | N. Dakota |
| 59 | Edward Rust | 8 | Son | — | N. Dakota |
| 60 | Joy Rust | 0 | Daughter | — | N. Dakota |
| 61 | Emil Oster | 34 | Head | Helper Loading Machine | N. Dakota |
| 62 | Sadie Oster | 34 | Wife | — | N. Dakota |
| 63 | Bernice Oster | 11 | Daughter | — | N. Dakota |
| 64 | Jerome Oster | 3 | Son | — | N. Dakota |
| 65 | Ben Betz | 36 | Head | Trackman | N. Dakota |
| 66 | Bertha Betz | 25 | Wife | — | N. Dakota |
| 67 | Wallace Betz | 6 | Son | — | N. Dakota |
| 68 | Margie Betz | 5 | Daughter | — | N. Dakota |
| 69 | Christ Witt | 65 | Head | — | South Russia |
| 70 | Katherine Witt | 69 | Wife | — | South Russia |
| 71 | Martha Betz | 58 | Head | Seamstress | S. Dakota |
| 72 | Ida Betz | 28 | Daughter | — | N. Dakota |
| 73 | Martha Betz | 21 | Daughter | Seamstress | N. Dakota |
| 74 | Margaret Tabert | 58 | Head | — | N. Dakota |
| 75 | Arthur Tabert | 26 | Head | Truck Driver | N. Dakota |
| 76 | Emma Tabert | 25 | Wife | — | N. Dakota |
| 77 | Dean Tabert | 6 | Son | — | N. Dakota |
| 78 | Larry Tabert | 3 | Son | — | N. Dakota |
| 79 | Arthur Isaacson | 56 | Head | Owner Manager | Sweden |
| 80 | Linda Isaacson | 40 | Wife | — | Wisconsin |
Pedigree Summary
Mary + 2 siblings
Gen 1 · 6 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)