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Mary Mccann — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Dubuque-County, Iowa
Our Model Tree links this Mary Mccann across the 1930 and 1940 US Censuses in Dubuque-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 6-person household.
Age 19
b. ~1921
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Dubuque-County, Iowa |
| Surname | McCann |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Center Township |
| 1935 Residence (County) | Dubuque |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Center Township |
| Est. Birth Year | ~1921 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Emmet Mccann | Son | — | 34 | ~1906 |
| Raymond Mccann | Son | — | 30 | ~1910 |
| Leonard Mccann | Son | — | 27 | ~1913 |
| Mary Mccann | Daughter | — | 19 | ~1921 |
| Lawrence Mccann | Son | — | 22 | ~1918 |
| Anna Mccann | Head | — | 57 | ~1883 |
Census Appearances
1930
Dubuque, Iowa
Daughter, age 9
Dubuque, Iowa · implied b. ~1921 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCann |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Dubuque-County, Iowa
Daughter, age 19
Dubuque-County, Iowa · implied b. ~1921 — 6 household members
| Surname | McCann |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Center Township |
| 1935 Residence (County) | Dubuque |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Mccann across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mccann
Daughter · 1940 · age 19 · b. ~1921 · Iowa
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Sibling
Raymond Mccann
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Emmet Mccann
Sibling · 1940 · age 34
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leonard Mccann
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Mccann
Sibling · 1940 · age 22
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 — Dubuque-County, Iowa
Open full size
1940 US Federal Census — Dubuque-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01158-00070)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Helen M. Staffel | 4 | Daughter | — | Iowa |
| 2 | Anna Mccann | 57 | Head | — | Iowa |
| 3 | Emmet J. Mccann | 34 | Son | Farmer | Iowa |
| 4 | Raymond J. Mccann | 30 | Son | Laborer | Iowa |
| 5 | Leonard W. Mccann | 27 | Son | Farmer | Iowa |
| 6 | Lawrence F. Mccann | 22 | Son | Laborer | Iowa |
| 7 | Mary M. Mccann THIS PERSON | 19 | Daughter | — | Iowa |
| 8 | Joseph W. Breitbach | 57 | Head | Farmer | Iowa |
| 9 | Barbara Breitbach | 56 | Wife | — | Iowa |
| 10 | Delores M. Breitbach | 16 | Daughter | — | Iowa |
| 11 | Clarence A. Breitbach | 22 | Son | Laborer | Iowa |
| 12 | Frank Houlahan | 42 | Hired Hand | Laborer | Iowa |
| 13 | Raymond J. Bartels | 38 | Head | Farmer | Iowa |
| 14 | Mary C. Bartels | 35 | Wife | — | Iowa |
| 15 | Janette A. Bartels | 4 | Daughter | — | Iowa |
| 16 | Roger A. Bartels | 1 | Son | — | Iowa |
| 17 | Catherine A. Lex | 78 | Mother-in-law | — | Germany |
| 18 | Peter J. Gansen | 74 | Head | Farmer | Germany |
| 19 | Elizabeth B. Gansen | 68 | Wife | — | Iowa |
| 20 | Mathias Gansen | 69 | Brother | — | Iowa |
| 21 | Theresa J. Riebel | 38 | Daughter | — | Iowa |
| 22 | Joseph J. Riebel | 17 | Grandson | Farming | Iowa |
| 23 | Margaret J. Riebel | 13 | Granddaughter | — | Iowa |
| 24 | Melvin J. Riebel | 11 | Grandson | — | Iowa |
| 25 | Dan M. Riebel | 9 | Grandson | — | Iowa |
| 26 | Joseph P. Schrobilgen | 49 | Head | Farmer | Iowa |
| 27 | Margaret L. Schrobilgen | 43 | Wife | — | Iowa |
| 28 | Melvin J. Schrobilgen | 19 | Son | Farming | Iowa |
| 29 | Dorothy M. Schrobilgen | 16 | Daughter | — | Iowa |
| 30 | Herman A. Schrobilgen | 14 | Daughter | — | Iowa |
| 31 | Robert A. Schrobilgen | 11 | Son | — | Iowa |
| 32 | Mary C. Schrobilgen | 8 | Daughter | — | Iowa |
| 33 | Patricia F. Schrobilgen | 2 | Daughter | — | Iowa |
| 34 | Thelma J. Schrobilgen | 0 | Daughter | — | Iowa |
| 35 | Lawrence J. Gunsmer | 37 | Head | Farmer | Iowa |
| 36 | Mary A. Gunsmer | 29 | Wife | — | Iowa |
| 37 | Ferdinand A. Gunsmer | 0 | Son | — | Iowa |
| 38 | Clarence J. Bartels | 25 | Head | Farmer | Iowa |
| 39 | Dolores M. Bartels | 23 | Wife | — | Iowa |
| 40 | Anna M. Bartels | 0 | Daughter | — | Iowa |
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)