MC
Mary Connor — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Mercer-County, New Jersey
Our Model Tree links this Mary Connor across the 1930 and 1940 US Censuses in Mercer-County, New Jersey (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 9-person household.
Age 11
b. ~1929
Female
Daughter
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, New Jersey |
| Surname | Connor |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Trenton |
| 1935 Residence (County) | Mercer |
| Additional Details | |
| Highest Grade | 5 |
| 1935 Residence | New Jersey |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Princeton |
| Est. Birth Year | ~1929 |
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 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Catherine Connor | Daughter | — | 13 | ~1927 |
| Mary Connor | Daughter | — | 11 | ~1929 |
| Helen Connor | Daughter | — | 15 | ~1925 |
| John Connor | Head | — | 46 | ~1894 |
| Stephen Connor | Son | — | 5 | ~1935 |
| John Connor | Son | — | 18 | ~1922 |
| James Connor | Son | — | 17 | ~1923 |
| Charles Connor | Son | — | 9 | ~1931 |
| Helen Connor | Spouse | — | 43 | ~1897 |
Census Appearances
1930
Mercer, New …
Daughter, age 1
Mercer, New Jersey · implied b. ~1929 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Connor |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New York |
| Mother's Birthplace | New Jersey |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Mercer-County, New …
Daughter, age 11
Mercer-County, New Jersey · implied b. ~1929 — 9 household members
| Surname | Connor |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Trenton |
| 1935 Residence (County) | Mercer |
| Highest Grade | 5 |
| 1935 Residence | New Jersey |
| 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 Connor across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Connor
Daughter · 1940 · age 11 · b. ~1929 · New Jersey
★ You are viewing this record
Sibling
Stephen Connor
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Connor
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Connor
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Connor
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Connor
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Connor
Sibling · 1940 · age 18
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, New Jersey
Open full size
1940 US Federal Census — Mercer-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02357-00583)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Patricia O'Kane | 8 | granddaughter | — | New Jersey |
| 42 | Marianne O'Kane | 6 | granddaughter | — | New York |
| 43 | Roger J. O'Kane | 2 | grandson | — | New Jersey |
| 44 | Cornelius P. Thiel | 57 | Head | Tinsmith | New York |
| 45 | Matilda Thiel | 48 | Wife | Domestic | Newfoundland |
| 46 | Donald Thiel | 16 | Son | — | New Jersey |
| 47 | Constantine Petrone | 63 | Head | Janitor | Italy |
| 48 | Rose Petrone | 61 | Wife | — | Italy |
| 49 | Gilda Petrone | 27 | Daughter | — | Italy |
| 50 | Alexander Petrone | 22 | Son | Night Watchman | New Jersey |
| 51 | Mary Petrone | 45 | Daughter | Secretary | New Jersey |
| 52 | John P. Connor | 46 | Head | Stationary Engr. | New Jersey |
| 53 | Helen Connor | 43 | Wife | Domestic | New Jersey |
| 54 | John S. Connor | 18 | Son | Truck Driver | New Jersey |
| 55 | James M. Connor | 17 | Son | — | New Jersey |
| 56 | Helen Connor | 15 | Daughter | — | New Jersey |
| 57 | Catherine Connor | 13 | Daughter | — | New Jersey |
| 58 | Mary Connor THIS PERSON | 11 | Daughter | — | New Jersey |
| 59 | Charles Connor | 9 | Son | — | New Jersey |
| 60 | Stephen Connor | 5 | Son | — | New Jersey |
| 61 | R. Theodore Risley | 33 | Head | Equipment Man | Pennsylvania |
| 62 | Adele Risley | 29 | Wife | — | Pennsylvania |
| 63 | Marie Risley | 9 | Daughter | — | Pennsylvania |
| 64 | Eugene Risley | 4 | Son | — | New Jersey |
| 65 | Robert Risley | 2 | Son | — | New Jersey |
| 66 | Peter De Mauro | 50 | Head | Shoemaker | Italy |
| 67 | Johanna De Mauro | 40 | Wife | — | Italy |
| 68 | Peter Jr. De Mauro | 18 | Son | New Worker | Italy |
| 69 | Michael De Mauro | 15 | Son | — | New Jersey |
| 70 | Daniel De Mauro | 13 | Son | — | New Jersey |
| 71 | Anna De Mauro | 81 | Mother | — | Italy |
| 72 | Abraham Schwartz | 23 | Lodger | Math. Research | New York |
| 73 | Valentine Bargmann | 32 | Lodger | Math. Research | Germany |
| 74 | Clarence H. Rootefeld | 35 | Head | Accountant | Ohio |
| 75 | Elizabeth M. Rootefeld | 30 | Wife | — | Ohio |
| 76 | William P. Rootefeld | 3 | Son | — | New Jersey |
| 77 | Peggy Ann Schroeder | 3 | Daughter | — | Pennsylvania |
| 78 | Mary Jane Schroeder | 3 | Daughter | — | Pennsylvania |
| 79 | Marie C. Eubalser | 42 | Lodger | Secretary | Massachusetts |
| 80 | David Wilbur | 2 | Son | — | New Jersey |
Related Census Records
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)