MC
Mary Connolly — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this Mary Connolly across the 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 10-person household.
Age 11
b. ~1929
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Connolly |
| Given Name | Mary Alice |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Same house |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1929 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Bernard Connolly | Son | — | 19 | ~1921 |
| Eleanor Connolly | Daughter | — | 17 | ~1923 |
| William Connolly | Son | — | 8 | ~1932 |
| John Connolly | Son | — | 22 | ~1918 |
| Fern Connolly | Spouse | — | 45 | ~1895 |
| Richard Connolly | Son | — | 18 | ~1922 |
| Mary Connolly | Daughter | — | 11 | ~1929 |
| John Connolly | Head | — | 49 | ~1891 |
| Margaret Connolly | Daughter | — | 16 | ~1924 |
| Marcella Connolly | Daughter | — | 12 | ~1928 |
Census Appearances
Daughter, age
Polk, Iowa · implied b. ~1930 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Connelly |
| Given Name | Mary Alice |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Daughter, age 11
Polk-County, Iowa · implied b. ~1929 — 10 household members
| Surname | Connolly |
| Given Name | Mary Alice |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Highest Grade | No 5 |
| 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 11 · b. ~1929 · Iowa
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Sibling
Richard Connolly
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernard Connolly
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marcella Connolly
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Connolly
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Connolly
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Connolly
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eleanor Connolly
Sibling · 1940 · age 17
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 — Polk-County, Iowa
Open full size
1940 US Federal Census — Polk-County, Iowa
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01193-00137)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Freeley, Mary K. Feeley | 3 | Daughter | — | Iowa |
| 42 | Harry E. Reynolds | 48 | Head | Superintendent | Iowa |
| 43 | Daisy E. Reynolds | 44 | Wife | — | Nebraska |
| 44 | Alberte Lane | 36 | Head | Manager | Kansas |
| 45 | Edna Lane | 36 | Wife | — | Missouri |
| 46 | Rowena Lane | 5 | Daughter | — | Missouri |
| 47 | Leslie C. Hoke | 61 | Head | Barber | Iowa |
| 48 | Minnie A. Hoke | 60 | Wife | — | Iowa |
| 49 | Earl M. Jones | 47 | Head | Carpenter | Iowa |
| 50 | Hazel M. Jones | 49 | Wife | — | Iowa |
| 51 | Kenneth Jones | 22 | Son | Truck Driver | Montana |
| 52 | Arnold G. Kieffer | 43 | Head | Representative | Iowa |
| 53 | Myrtle M. Kieffer | 42 | Wife | — | Iowa |
| 54 | Mary M. Kieffer | 18 | Daughter | — | Iowa |
| 55 | William J. Kieffer | 7 | Son | — | Iowa |
| 56 | Ann K. Kieffer | 2 | Daughter | — | Iowa |
| 57 | Lisle E. Kirkwood | 34 | Head | Attendant | Iowa |
| 58 | Hazel I. Kirkwood | 32 | Wife | — | Iowa |
| 59 | Richard Kirkwood | 9 | Son | — | Iowa |
| 60 | Marilyn J. Kirkwood | 5 | Daughter | — | Iowa |
| 61 | Lisle D. Kirkwood | 4 | Son | — | Iowa |
| 63 | John Jr. Connolly | 49 | Head | Lawyer | Iowa |
| 64 | Fern Connolly | 45 | Wife | — | Iowa |
| 65 | John Connolly | 22 | Son | — | Iowa |
| 66 | Bernard Connolly | 19 | Son | — | Iowa |
| 67 | Richard Connolly | 18 | Son | — | Iowa |
| 68 | Eleanor Connolly | 17 | Daughter | — | Iowa |
| 69 | Margaret Connolly | 16 | Daughter | — | Iowa |
| 70 | Marcella Connolly | 12 | Daughter | — | Iowa |
| 71 | Mary Alice Connolly THIS PERSON | 11 | Daughter | — | Iowa |
| 72 | William Connolly | 8 | Son | — | Iowa |
| 73 | Walter R. Kirsch | 44 | Head | Jeweler | Iowa |
| 74 | Lucy E. Kirsch | 48 | Wife | — | Iowa |
| 75 | Robert Kirsch | 15 | Son | — | Iowa |
| 76 | Francis Kirsch | 12 | Son | — | Iowa |
| 77 | Herman Kirsch | 80 | Father | — | Germany |
| 78 | Franciska Kirsch | 75 | Mother | — | Germany |
| 79 | Wren L. Dipson | 50 | Head | Maintainer | Iowa |
| 80 | Clella Dipson | 49 | Wife | — | 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)