MC
Mary Connolly — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Woodbury-County, Iowa
Our Model Tree links this Mary Connolly across the 1930 and 1940 US Censuses in Woodbury-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 9-person household.
Age 18
b. ~1922
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Woodbury-County, Iowa |
| Surname | Connolly |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Sioux City |
| 1935 Residence (County) | Woodbury |
| Additional Details | |
| Industry | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Sioux 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Don Connolly | Son | — | 9 | ~1931 |
| James Connolly | Son | — | 16 | ~1924 |
| Mary Collins | Other | — | 85 | ~1855 |
| Mary Connolly | Daughter | — | 18 | ~1922 |
| Daniel Connolly | Head | — | 53 | ~1887 |
| Kathleen Connolly | Daughter | — | 13 | ~1927 |
| Maurice Connolly | Son | — | 22 | ~1918 |
| Helen Connolly | Spouse | — | 50 | ~1890 |
| Edward Connolly | Son | — | 19 | ~1921 |
Census Appearances
1930
Woodbury, Iowa
Daughter, age 8
Woodbury, Iowa · implied b. ~1922 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Connolly |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | South Dakota |
| Mother's Birthplace | Nebraska |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Woodbury-County, Iowa
Daughter, age 18
Woodbury-County, Iowa · implied b. ~1922 — 9 household members
| Surname | Connolly |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Sioux City |
| 1935 Residence (County) | Woodbury |
| Industry | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| 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 Connolly across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Connolly
Daughter · 1940 · age 18 · b. ~1922 · Iowa
★ You are viewing this record
Sibling
Kathleen Connolly
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Connolly
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Maurice Connolly
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Don Connolly
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Connolly
Sibling · 1940 · age 19
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 — Woodbury-County, Iowa
Open full size
1940 US Federal Census — Woodbury-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01214-00833)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mary Alice Moran | 10 | daughter | — | Iowa |
| 42 | Edward Jr. Moran | 8 | son | — | Iowa |
| 43 | James F Moran | 4 | son | — | Iowa |
| 44 | Otto Zuck | 60 | head | Traveling Salesman | Iowa |
| 45 | Bertha Zuck | 50 | wife | — | Iowa |
| 46 | Sarah Morris | 82 | mother | — | Ohio |
| 47 | Benjamin Snare | 48 | head | Heating Engineer | Iowa |
| 48 | Mary Snare | 45 | wife | — | Iowa |
| 49 | Emil Carlson | 56 | head | Proprietor | Iowa |
| 50 | Elizabeth Carlson | 47 | wife | — | Iowa |
| 51 | Charles Carlson | 16 | son | — | Iowa |
| 52 | James H. Walsh | 44 | head | Commission Salesman | Nebraska |
| 53 | Cara Walsh | 35 | wife | — | South Dakota |
| 54 | Patricia Walsh | 10 | daughter | — | Iowa |
| 55 | James Walsh | 8 | son | — | Iowa |
| 56 | Margaret Walsh | 77 | mother | — | Nebraska |
| 57 | Sam Passman | 55 | head | Traveling Salesman | Russia |
| 58 | Rose Passman | 50 | wife | — | Russia |
| 59 | Marion Passman | 18 | daughter | — | Iowa |
| 60 | Ray P. Reilly | 51 | head | Traveling Salesman | Iowa |
| 61 | Pearl K. Reilly | 52 | wife | — | Iowa |
| 62 | Eugene M Reilly | 21 | son | — | Iowa |
| 63 | Jack P Reilly | 23 | son | Salesman | Iowa |
| 64 | Jerry Reilly | 21 | daughter-in-law | — | Iowa |
| 65 | Raymond J. Reilly | 1 | grand-child | — | California |
| 66 | Daniel Connolly | 53 | head | Supervisor | South Dakota |
| 67 | Helen Connolly | 50 | wife | — | Nebraska |
| 68 | Maurice Connolly | 22 | son | Clerk | Iowa |
| 69 | Edward Connolly | 19 | son | Salesman | Iowa |
| 70 | Mary Connolly THIS PERSON | 18 | daughter | — | Iowa |
| 71 | James Connolly | 16 | son | — | Iowa |
| 72 | Kathleen Connolly | 13 | daughter | — | Iowa |
| 73 | Don Connolly | 9 | son | — | Iowa |
| 74 | Mary Collins | 85 | Aunt | — | New York |
| 75 | Grace Cassian | 45 | head | — | Iowa |
| 76 | Franklin Cassian | 6 | son | — | Iowa |
| 77 | — | None | — | — | — |
| 78 | Max Epstein | 41 | head | Chemist | Russia |
| 79 | Anna G. Epstein | 40 | wife | — | Russia |
| 80 | Esther L Epstein | 14 | daughter | — | Nebraska |
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)