MC
Mary Cox — 1930 US Census Record
Model Tree available1930 United States Federal Census · Union, New Jersey
Our Model Tree links this Mary Cox across the 1920, 1930 and 1940 US Censuses in Union, New Jersey (XGBoost, ~Confirmed), with identified parents Archibald & Frances — first a daughter (b.~1917), then head of a 9-person household.
Age 13
b. ~1917
Female
Daughter
Born: New Jersey
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Union, New Jersey |
| Surname | Cox |
| Given Name | Mary D. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Vermont |
| Additional Details | |
| Occupation | none |
| Industry | none |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Plainfield |
| Est. Birth Year | ~1917 |
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.
9 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Cox | Daughter | — | 13 | ~1917 |
| Eliz Cox | Daughter | — | 16 | ~1914 |
| Arch Cox | Head | — | 55 | ~1875 |
| Maria Cox | Other | — | 37 | ~1893 |
| Lewis Cox | Son | — | 5 | ~1925 |
| Roland Cox | Son | — | 2 | ~1928 |
| Robert Cox | Son | — | 11 | ~1919 |
| Maxwell Cox | Son | — | 7 | ~1923 |
| Arch Cox | Son | — | 17 | ~1913 |
Census Appearances
1920
Union, New …
Daughter, age 3
Union, New Jersey · implied b. ~1917 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Mary D. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Vermont |
| Speaks English | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Union, New …
Daughter, age 13
Union, New Jersey · implied b. ~1917 — 9 household members
| Surname | Cox |
| Given Name | Mary D. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Vermont |
| Occupation | none |
| Industry | none |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Somerset-County, New …
Other, age 23
Somerset-County, New Jersey · implied b. ~1917 — 40 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Margaret |
| Relationship to Head | patient |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Montgomery |
| 1935 Residence (County) | Somerset |
| Industry | inst |
| Highest Grade | No 0 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 Archibald Cox (~0.92 confidence) and mother Frances Cox (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Archibald Cox
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Frances Cox
b. ~1893
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Cox
Daughter · 1930 · age 13 · b. ~1917 · New Jersey
★ You are viewing this record
Sibling
Maxwell Cox
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Cox
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lewis Cox
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eliz Cox
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Roland Cox
Sibling · 1930 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arch Cox
Sibling · 1930 · age 17
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
1930 US Federal Census — Union, New Jersey
Open full size
1930 US Federal Census — Union, New Jersey
Page Contents
50 people indexed on this census page (ia:1930:newjerseycensus00reel1388:0862)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert Hunt | 3 | Son | None | New Jersey |
| 2 | Tiffany Ruth Hunt | 29 | daughter | Maid | Kansas |
| 3 | William Sallman | 54 | Head | Sales Manager | New York |
| 4 | Mary E. Sallman | 54 | wife-H | None | Pennsylvania |
| 5 | Eleanor M. Sallman | 24 | daughter | None | New York |
| 6 | Craig Sallman | 16 | son | None | New Jersey |
| 7 | James Ackerman | 34 | Head | Cement Business | Massachusetts |
| 8 | Art Ackerman | 27 | wife-H | None | New York |
| 9 | Julia Mae Foster | 71 | Head | None | Indiana |
| 10 | Anna L. Coombs | 60 | lodger | None | New Jersey |
| 11 | William Strong | 36 | Head | Broker | New York |
| 12 | Elizabeth Strong | 32 | wife-H | None | New York |
| 13 | Betty C. Strong | 5 | daughter | None | New Jersey |
| 14 | Janet Strong | 2 | daughter | None | New Jersey |
| 15 | Mary Fleming | 45 | maid | Nurse | Pennsylvania |
| 16 | Henry Sonderegger | 29 | butler | Butler | Switzerland |
| 17 | Hedwig Sonderegger | 31 | wife | Maid | Switzerland |
| 18 | Frank S. Heit | 59 | Head | Lawyer | New Jersey |
| 19 | Florence J. Heit | 56 | wife-H | None | New Jersey |
| 20 | Lois Heit | 22 | daughter | None | New Jersey |
| 21 | Clarence Connor | 37 | Head | Sales Manager | Missouri |
| 22 | Helen M. Connor | 34 | wife-H | None | Ohio |
| 23 | Samuel Connor | 10 | son | None | Ohio |
| 24 | Mary Stevenson | 48 | maid | Maid | Virginia |
| 25 | Charles Gilman | 48 | Head | Civil Engineer | Massachusetts |
| 26 | Alva Gilman | 47 | wife-H | None | Massachusetts |
| 27 | Carl Gilman | 19 | son | None | New Jersey |
| 28 | George Gilman | 15 | son | None | New Jersey |
| 29 | Elizabeth Woodhull | 69 | wife | None | New Jersey |
| 30 | Anna Marston | 55 | companion | None | New York |
| 31 | Anna Pazywora | 27 | maid | Maid | Poland |
| 32 | Roswell H. Randall | 39 | Head | Paper Dealer | New York |
| 33 | Louise C. Randall | 39 | wife-H | None | New York |
| 34 | Barbara Randall | 9 | daughter | None | New Jersey |
| 35 | Nancy Randall | 8 | daughter | None | New Jersey |
| 36 | Elizabeth Randall | 4 | daughter | None | New Jersey |
| 37 | Mary Magee | 20 | maid | Maid | Ireland N. |
| 38 | Napoleon Penton | 48 | Head | Tool Maker | Connecticut |
| 39 | Florence M. Penton | 46 | wife-H | None | New Jersey |
| 40 | Marion A. Penton | 20 | daughter | Clerk | Massachusetts |
| 41 | Hazel Penton | 15 | daughter | None | Massachusetts |
| 42 | Arch Cox | 55 | Head | Lawyer | Delaware |
| 43 | Maria B. Cox | 37 | wife-H | None | Vermont |
| 44 | Arch Jr. Cox | 17 | son | None | New Jersey |
| 45 | Eliz. B. Cox | 16 | daughter | None | New Jersey |
| 46 | Mary D. Cox THIS PERSON | 13 | daughter | None | New Jersey |
| 47 | Robert H. Cox | 11 | son | None | New Jersey |
| 48 | Maxwell Cox | 7 | son | None | New Jersey |
| 49 | Lewis Cox | 5 | son | None | New Jersey |
| 50 | Roland Cox | 2 | son | None | New Jersey |
Related Census Records
Pedigree Summary
Mary + 6 siblings
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 1930 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)