MC
Mary Cooper — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, New Jersey
Our Model Tree links this Mary Cooper across the 1920, 1930 and 1940 US Censuses in Essex-County, New Jersey (XGBoost, ~Confirmed) — first a spouse (b.~1881), then head of a 5-person household.
Age 59
b. ~1881
Female
Spouse
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, New Jersey |
| Surname | Cooper |
| Given Name | Mary L. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Montclair |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Montclair |
| Est. Birth Year | ~1881 |
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 |
|---|---|---|---|---|
| Walter Cooper | Head | — | 60 | ~1880 |
| Adelaide Cooper | Other | — | 31 | ~1909 |
| Wallace Cooper | Son | — | 38 | ~1902 |
| Frank Cooper | Son | — | 17 | ~1923 |
| Mary Cooper | Spouse | — | 59 | ~1881 |
Census Appearances
1920
Essex, New …
Spouse, age 39
Essex, New Jersey · implied b. ~1881 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Mary L |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Essex, New …
Other, age 49
Essex, New Jersey · implied b. ~1881 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Mary L |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 21 |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Maine |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Essex-County, New …
Spouse, age 59
Essex-County, New Jersey · implied b. ~1881 — 5 household members
| Surname | Cooper |
| Given Name | Mary L. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Montclair |
| 1935 Residence (County) | Essex |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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.
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This person
Anchor record
Mary Cooper
Spouse · 1940 · age 59 · b. ~1881 · New Jersey
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Essex-County, New Jersey
Open full size
1940 US Federal Census — Essex-County, New Jersey
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-02337-00145)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert L. Haas | 45 | Head | Salesman | Germany |
| 2 | Florence A. Haas | 45 | Wife | — | Brazil |
| 3 | Edith V. Haas | 14 | Daughter | — | New Jersey |
| 4 | Nancy L. Haas | 9 | Daughter | — | New Jersey |
| 5 | William Mc Causland | 49 | Head | Sales Mgr. | Pennsylvania |
| 6 | Ida B. Mc Causland | 40 | Wife | — | Pennsylvania |
| 7 | Walter W. Cooper | 60 | Head | Salesman | Ohio |
| 8 | Mary L. Cooper THIS PERSON | 59 | Wife | — | Massachusetts |
| 9 | Wallace R. Cooper | 38 | Son | Salesman | Ohio |
| 10 | Adelaide Cooper | 31 | Daughter-in-law | — | New York |
| 11 | Frank B. Cooper | 17 | Son | — | New Jersey |
| 12 | Joseph F. Woodcock | 44 | Head | Clerical | New York |
| 13 | Virginia Woodcock | 33 | Wife | — | Massachusetts |
| 14 | Donald Woodcock | 11 | Son | — | New Jersey |
| 15 | Richard Woodcock | 8 | Son | — | New Jersey |
| 16 | Clara L. Stevens | 54 | Aunt | — | New York |
| 17 | John C. Moore | 54 | Head | Engineer | Maryland |
| 18 | Alta J. Moore | 51 | Wife | — | Canada |
| 19 | Carlisle Dana | 60 | Head | — | New Jersey |
| 20 | Alice P. Dana | 55 | Wife | — | New York |
| 21 | Marion Graham | 71 | Head | — | New York |
| 22 | Nellie C. Wyatt | 64 | Sister | — | New York |
| 23 | Helen Blackman | 35 | Boarder | Teacher | New York |
| 24 | Arthur P. Hagar | 59 | Head | Clerical | New Jersey |
| 25 | Elizabeth P. Hagar | 59 | Wife | — | New Jersey |
| 26 | Irylene P. Gartland | 83 | Mother-in-law | — | New York |
| 27 | James W. Wooster | 60 | Head | — | New York |
| 28 | Anna J. Wooster | 57 | Wife | — | New York |
| 29 | Frederick J. Redmond | 42 | Head | Engineer | Pennsylvania |
| 30 | Mary A. Redmond | 83 | Mother | — | New York |
| 31 | Anna Muench | 29 | Servant | Maid | Pennsylvania |
| 32 | Richard B. Elliott | 68 | Head | Salesman | New York |
| 33 | Evelyn W. Elliott | 64 | Wife | — | New York |
| 34 | Fred C. Childs | 22 | Boarder | Runner | New York |
| 35 | Archie L. Threlkeld | 51 | Head | Superintendent | Missouri |
| 36 | Mary H. Threlkeld | 48 | Wife | — | Missouri |
| 37 | Archie L. Threlkeld | 25 | Son | Reporter | Missouri |
| 38 | Richard A. Threlkeld | 23 | Son | Clerk | Missouri |
| 39 | Ellen H. Threlkeld | 20 | Daughter | Odd Jobs | Missouri |
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)