MD
Mary Duffy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Douglas-County, Nebraska
Our Model Tree links this Mary Duffy across the 1920, 1930 and 1940 US Censuses in Douglas-County, Nebraska (XGBoost, ~Confirmed), with identified parents Joseph & Joseph — first a daughter (b.~1916), then head of a 4-person household.
Age 24
b. ~1916
Female
Daughter
Born: South Dakota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Douglas-County, Nebraska |
| Surname | Duffy |
| Given Name | Mary Patricia |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | South Dakota |
| 1935 Residence (City) | Omaha City |
| 1935 Residence (County) | Douglas |
| Additional Details | |
| Occupation | mail Dept Clerk |
| Industry | Wholesale implement Co |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 705 |
| Highest Grade | C 4 |
| 1935 Residence | Same house |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
| Occupation | Mail Dept Clerk |
| Township / Ward | Omaha City |
| Est. Birth Year | ~1916 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Duffy | Daughter | — | 21 | ~1919 |
| Mary Duffy | Daughter | — | 24 | ~1916 |
| Joseph Duffy | Head | — | 53 | ~1887 |
| Gertrude Duffy | Spouse | — | 49 | ~1891 |
Census Appearances
1920
Douglas, Nebraska
Daughter, age 3
Douglas, Nebraska · implied b. ~1917 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Mary P |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | South Dakota |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Nebraska |
| Can Read | No |
| Can Write | No |
| Speaks English | No |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1930
Douglas, Nebraska
Daughter, age 14
Douglas, Nebraska · implied b. ~1916 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Mary Pat |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | South Dakota |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Nebraska |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1940
Douglas-County, Nebraska
Daughter, age 24
Douglas-County, Nebraska · implied b. ~1916 — 4 household members
| Surname | Duffy |
| Given Name | Mary Patricia |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | South Dakota |
| 1935 Residence (City) | Omaha City |
| 1935 Residence (County) | Douglas |
| Occupation | mail Dept Clerk |
| Industry | Wholesale implement Co |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 705 |
| Highest Grade | C 4 |
| 1935 Residence | Same house |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
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 Duffy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Joseph Duffy (~0.92 confidence) and father Joseph Duffy (~0.92 confidence) and mother Gertrude Duffy (~0.92 confidence) and mother Gertrude Duffy (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Joseph Duffy
b. ~1887
Source father
● Household
· direct · ~0.92
Father
Joseph Duffy
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Gertrude Duffy
b. ~1891
Source mother
● Household
· direct · ~0.92
Mother
Gertrude Duffy
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Duffy
Daughter · 1940 · age 24 · b. ~1916 · Nebraska
★ You are viewing this record
Sibling
Mary Duffy
Sibling · 1940 · age 21
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 — Douglas-County, Nebraska
Open full size
1940 US Federal Census — Douglas-County, Nebraska
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-02275-00370)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Helen Morris | 30 | wife | Saleslady | South Dakota |
| 42 | Kenyon D Morris | 11 | son | — | Iowa |
| 43 | Ralph Meinershagen | 32 | head | Manager | Missouri |
| 44 | Alma Meinershagen | 30 | wife | — | Missouri |
| 45 | Marilyn Meinershagen | 6 | daughter | — | Missouri |
| 46 | Sue Meinershagen | 5 | daughter | — | Missouri |
| 47 | Montrose Holmes | 42 | head | Freight Rate Clerk | Nebraska |
| 48 | Josephine Holmes | 40 | wife | — | Nebraska |
| 49 | Betty Holmes | 18 | daughter | — | Nebraska |
| 50 | Arthur W Swanson | 40 | head | Manager Of Branch | Nebraska |
| 51 | Nellie Mae Swanson | 55 | wife | — | Iowa |
| 52 | John Gatewood | 29 | head | Assistant Doctor | Nebraska |
| 53 | Elizabeth Gatewood | 24 | wife | — | Nebraska |
| 54 | Jeanne Marie Gatewood | 3 | daughter | — | Pennsylvania |
| 55 | William Fowler | 57 | head | Platform Foreman | New Jersey |
| 56 | Fredericka Fowler | 62 | wife | — | Germany |
| 57 | Daniel Woodruff | 40 | head | — | Missouri |
| 58 | Myra Woodruff | 32 | wife | — | Nebraska |
| 59 | Janice Woodruff | 12 | daughter | — | Nebraska |
| 61 | Jerome Campbell | 41 | head | Traveling Salesman | Iowa |
| 62 | Dorothy Campbell | 29 | wife | — | Nebraska |
| 63 | William Campbell | 7 | son | — | Nebraska |
| 64 | Carlton Deems | 49 | head | Real Estate Salesman | Nebraska |
| 65 | Elsie M Deems | 43 | wife | Cap Maker | Nebraska |
| 66 | Carlton Jr Deems | 25 | son | Crane Man | South Dakota |
| 67 | Doris Mae Deems | 9 | daughter | — | Nebraska |
| 68 | Johanna Sothman | 73 | mother | — | Germany |
| 69 | Esther King | 47 | head | — | Nebraska |
| 70 | George H King | 25 | son | — | Illinois |
| 71 | Hilma Patrick | 51 | sister | Auditor | Nebraska |
| 72 | M May Hitchinson | 64 | head | — | West Virginia |
| 73 | C Jessie Hoffman | 57 | sister | — | West Virginia |
| 74 | Ralph C Clarke | 34 | lodger | Sales Office Manager | Iowa |
| 75 | Mabel R Jones | 46 | head | Private Secretary | Indiana |
| 76 | Jacqueline Jones | 15 | daughter | — | Nebraska |
| 77 | Joseph Duffy | 53 | head | Cashier | Minnesota |
| 78 | Gertrude Duffy | 49 | wife | — | Nebraska |
| 79 | Mary Patricia Duffy THIS PERSON | 24 | daughter | Mail Dept Clerk | South Dakota |
| 80 | Mary Nadine Duffy | 21 | daughter | — | Nebraska |
Pedigree Summary
Mary + 1 sibling
Gen 1 · 4 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)