MC
Mary Connell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this Mary Connell across the 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 7-person household.
Age 18
b. ~1922
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Connell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Cedar Falls City |
| 1935 Residence (County) | Black Hawk |
| Additional Details | |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Cedar Falls City |
| Est. Birth Year | ~1922 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Margaret Connell | Daughter | — | 9 | ~1931 |
| Charles Connell | Head | — | 59 | ~1881 |
| James Connell | Son | — | 20 | ~1920 |
| Jane Connell | Daughter | — | 17 | ~1923 |
| Mary Connell | Daughter | — | 18 | ~1922 |
| Margaret Connell | Spouse | — | 49 | ~1891 |
| Charles Connell | Son | — | 13 | ~1927 |
Census Appearances
1930
Black Hawk, …
Daughter, age 8
Black Hawk, Iowa · implied b. ~1922 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Connell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| 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
Black-Hawk-County, Iowa
Daughter, age 18
Black-Hawk-County, Iowa · implied b. ~1922 — 7 household members
| Surname | Connell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Cedar Falls City |
| 1935 Residence (County) | Black Hawk |
| Highest Grade | C 1 |
| 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 Connell across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Connell
Daughter · 1940 · age 18 · b. ~1922 · Iowa
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Sibling
Charles Connell
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jane Connell
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Connell
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Connell
Sibling · 1940 · age 20
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 — Black-Hawk-County, Iowa
Open full size
1940 US Federal Census — Black-Hawk-County, Iowa
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-01139-00211)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Chester P. Bennett | 25 | Head | Machinist | Iowa |
| 2 | Irene Bennett | 21 | Wife | — | Iowa |
| 4 | Paul K. Mitchell | 38 | Head | Engineer | Ohio |
| 5 | Marian Mitchell | 35 | Wife | — | Indiana |
| 6 | Paul Jr. Mitchell | 17 | Son | Janitor Work | Indiana |
| 7 | Norma Jacqueline Mitchell | 15 | Daughter | — | Indiana |
| 8 | Robert Fred Mitchell | 13 | Son | — | Indiana |
| 9 | Gloria Joy Mitchell | 8 | Daughter | — | Indiana |
| 10 | Audrey Olson | 18 | Lodger | Clerk | Minnesota |
| 11 | John G. Baumgartner | 53 | Head | Minister | Iowa |
| 12 | Nora Baumgartner | 51 | Wife | — | Wisconsin |
| 13 | Rachel Baumgartner | 19 | Daughter | — | Iowa |
| 14 | Eunice Baumgartner | 15 | Daughter | — | Iowa |
| 15 | Miriam Baumgartner | 10 | Daughter | — | Iowa |
| 16 | Roland F. Warner | 43 | Head | Lawyer | Iowa |
| 17 | Jane Warner | 44 | Wife | — | Iowa |
| 18 | Marianna Warner | 13 | Daughter | — | Iowa |
| 19 | Roland William Warner | 9 | Son | — | Iowa |
| 20 | Bertha Wise | 64 | Head | — | Iowa |
| 21 | Ethel Wise | 60 | Sister | — | Iowa |
| 22 | Charles J. Connell | 59 | Head | Proprietor | Iowa |
| 23 | Margaret Connell | 49 | Wife | — | Iowa |
| 24 | James Connell | 20 | Son | Bookkeeper | Iowa |
| 25 | Mary Connell THIS PERSON | 18 | Daughter | — | Iowa |
| 26 | Jane Connell | 17 | Daughter | — | Iowa |
| 27 | Charles Joseph Connell | 13 | Son | — | Iowa |
| 28 | Margaret Ann Connell | 9 | Daughter | — | Iowa |
| 29 | Isabelle Watters | 74 | Head | — | Vermont |
| 30 | Earl Brown | 50 | Head | Proprietor | Iowa |
| 31 | Maude Brown | 50 | Wife | — | Iowa |
| 32 | Merril Brown | 13 | Son | — | Iowa |
| 33 | Oliver M. Yaggy | 59 | Head | Minister | Iowa |
| 34 | Edna Yaggy | 59 | Wife | — | Illinois |
| 35 | Mark W. Yaggy | 21 | Son | Clerk | Iowa |
| 36 | Marsha E. Yaggy | 19 | Daughter | Bookkeeper | Iowa |
| 38 | David J. Watters | 71 | Head | Pharmacist | Iowa |
| 39 | Mildred Watters | 64 | Wife | — | Iowa |
| 40 | Tilda Johnson | 76 | Head | — | Denmark |
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)