MC
Mary Cooper — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Union-County, New Jersey
Our Model Tree links this Mary Cooper across the 1920, 1930 and 1940 US Censuses in Union-County, New Jersey (XGBoost, ~Confirmed) — first a head (b.~1870), then head of a 5-person household.
Age 70
b. ~1870
Female
Head
Born: New Jersey
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Union-County, New Jersey |
| Surname | Cooper |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 70 |
| Marital Status | Widowed |
| Birthplace | New Jersey |
| 1935 Residence (City) | Plainfield (City) |
| 1935 Residence (County) | Union |
| Additional Details | |
| Highest Grade | 7 |
| 1935 Residence | Same House |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Plainfield City |
| Est. Birth Year | ~1870 |
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 |
|---|---|---|---|---|
| Ethel Cooper | Daughter | — | 41 | ~1899 |
| Mary Cooper | Head | — | 70 | ~1870 |
| Rita Cooper | Other | — | 5 | ~1935 |
| Sara Cooper | Other | — | 26 | ~1914 |
| Leroy Cooper | Son | — | 37 | ~1903 |
Census Appearances
1920
Union, New …
Head, age 50
Union, New Jersey · implied b. ~1870 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 50 |
| Marital Status | Widowed |
| Birthplace | New Jersey |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Union, New …
Other, age 60
Union, New Jersey · implied b. ~1870 — 50 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Mary |
| Sex | F |
| Color / Race | White |
| Age | 60 |
| Marital Status | Widowed |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Occupation | none |
| Industry | none |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Union-County, New …
Head, age 70
Union-County, New Jersey · implied b. ~1870 — 5 household members
| Surname | Cooper |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 70 |
| Marital Status | Widowed |
| Birthplace | New Jersey |
| 1935 Residence (City) | Plainfield (City) |
| 1935 Residence (County) | Union |
| Highest Grade | 7 |
| 1935 Residence | Same House |
| 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 Cooper across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Cooper
Head · 1940 · age 70 · b. ~1870 · New Jersey
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Union-County, New Jersey
Open full size
1940 US Federal Census — Union-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02387-00755)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Phoebe Cook | 18 | Head | — | New Jersey |
| 42 | Virginia Cook | 16 | Daughter | — | New Jersey |
| 43 | Leonard Murray | 39 | Head | Policeman | New Jersey |
| 44 | Gertrude Murray | 38 | Wife | — | New Jersey |
| 45 | Leona Murray | 13 | Daughter | — | New Jersey |
| 46 | Leonard Jr Murray | 11 | Son | — | New Jersey |
| 47 | Margaret Murray | 10 | Daughter | — | New Jersey |
| 48 | Richard Murray | 8 | Son | — | New Jersey |
| 49 | Mary Cooper THIS PERSON | 70 | Head | — | New Jersey |
| 50 | Ethel Cooper | 41 | Daughter | — | New Jersey |
| 51 | Leroy Cooper | 37 | Son | Proprietor | New Jersey |
| 52 | Sara Cooper | 26 | Daughter-in-law | — | New Jersey |
| 53 | Rita L Cooper | 5 | Granddaughter | — | New Jersey |
| 54 | Joseph B Lyon | 30 | Head | Mail Carrier | New Jersey |
| 55 | Lucy E Lyon | 28 | Wife | — | New Jersey |
| 56 | Patricia A Lyon | 0 | Daughter | — | New Jersey |
| 57 | John B Slorah | 27 | Head | Jr Underwriter | New Jersey |
| 58 | Doris E Slorah | 21 | Wife | — | New Jersey |
| 59 | Frank G Freeman | 56 | Head | Salesman | New Jersey |
| 60 | Ada L Freeman | 50 | Wife | — | New Jersey |
| 61 | Frederick Elizabeth Freeman | 19 | Son | — | New Jersey |
| 62 | Susan B Vail | 47 | Head | Secretary | New York |
| 63 | Annie E Vail | 27 | Son | Asst To Pres | New Jersey |
| 64 | John T Gray | 44 | Head | Sales Manager | New Jersey |
| 65 | Lillian M Gray | 43 | Wife | — | Pennsylvania |
| 66 | Jacqueline M Gray | 16 | Daughter | — | New York |
| 67 | Joan B Gray | 14 | Daughter | — | New York |
| 68 | John B Jr Gray | 12 | Son | — | New York |
| 69 | Reinhard H Hunsicker | 34 | Head | Manager | New York |
| 70 | Mary B Hunsicker | 33 | Wife | — | New Jersey |
| 71 | Bruce L Hunsicker | 7 | Son | — | New Jersey |
| 72 | Harvey L Lindsley | 50 | Head | Asst Treas | New York |
| 73 | Irene T Lindsley | 41 | Wife | — | New Jersey |
| 74 | Eleanor V Brown | 25 | Step-daughter | Support | New Jersey |
| 75 | Minton M Wooten | 48 | Head | School Teacher | Kentucky |
| 76 | Hollis H Wooten | 47 | Wife | — | Kentucky |
| 77 | Marie Wooten | 23 | Daughter | Librarian | Wisconsin |
| 78 | Julian Wooten | 20 | Son | Messenger | Ohio |
| 79 | Alice Martin | 63 | Head | — | England |
| 80 | J Wade Wurser | 50 | Head | Principal | Pennsylvania |
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)