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Mary Mcelroy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Floyd-County, Iowa
Our Model Tree links this Mary Mcelroy across the 1930 and 1940 US Censuses in Floyd-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 7-person household.
Age 14
b. ~1926
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Floyd-County, Iowa |
| Surname | McElroy |
| Given Name | Mary C |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Floyd |
| Additional Details | |
| Hours Worked | 8 |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Rockford Twp |
| Est. Birth Year | ~1926 |
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 |
|---|---|---|---|---|
| William Mcelroy | Son | — | 9 | ~1931 |
| Charles Mcelroy | Son | — | 16 | ~1924 |
| Bernadine Mcelroy | Daughter | — | 25 | ~1915 |
| Rose Mcelroy | Spouse | — | 43 | ~1897 |
| Mary Mcelroy | Daughter | — | 14 | ~1926 |
| Lewis Mcelroy | Head | — | 51 | ~1889 |
| Robert Mcelroy | Son | — | 17 | ~1923 |
Census Appearances
1930
Floyd, Iowa
Daughter, age 4
Floyd, Iowa · implied b. ~1926 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McElroy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Floyd-County, Iowa
Daughter, age 14
Floyd-County, Iowa · implied b. ~1926 — 7 household members
| Surname | McElroy |
| Given Name | Mary C |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Floyd |
| Hours Worked | 8 |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Iowa |
| 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 Mcelroy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcelroy
Daughter · 1940 · age 14 · b. ~1926 · Iowa
★ You are viewing this record
Sibling
William Mcelroy
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernadine Mcelroy
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Mcelroy
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Mcelroy
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 — Floyd-County, Iowa
Open full size
1940 US Federal Census — Floyd-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01161-00395)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Joseph H Paulus | 76 | Head | Retired | Wisconsin |
| 2 | Earl C Paulus | 28 | Son | Farming | Iowa |
| 3 | Bernice A Paulus | 22 | Daughter-in-law | — | Iowa |
| 4 | Janice R Paulus | 4 | G-Daughter | — | Iowa |
| 5 | William H Paulus | 3 | G-Son | — | Iowa |
| 6 | Robert E Paulus | 2 | G-Son | — | Iowa |
| 7 | Byron R Munson | 55 | Head | Farming | Iowa |
| 8 | Gertrude Munson | 52 | Wife | — | Iowa |
| 9 | Hazel M Munson | 19 | Daughter | — | Iowa |
| 10 | Karl H Ficken | 60 | Head | Farming | Germany |
| 11 | Emma Ficken | 58 | Wife | — | Germany |
| 12 | Karl Jr Ficken | 25 | Son | Farming | Iowa |
| 13 | Goldie Ficken | 19 | Daughter-in-law | — | Missouri |
| 14 | Lewis A Mcelroy | 51 | Head | Farming | Iowa |
| 15 | Rose A Mcelroy | 43 | Wife | — | Iowa |
| 16 | Bernadine L Mcelroy | 25 | Daughter | Housekeeper | Iowa |
| 17 | Robert E Mcelroy | 17 | Son | Laborer | Iowa |
| 18 | Charles C Mcelroy | 16 | Son | — | Iowa |
| 19 | Mary C Mcelroy THIS PERSON | 14 | Daughter | — | Iowa |
| 20 | William K Mcelroy | 9 | Son | — | Iowa |
| 21 | George H Mcelroy | 73 | Head | Retired | Wisconsin |
| 22 | Ida G Mcelroy | 36 | Daughter | — | Iowa |
| 23 | Lyle L Garrett | 28 | Head | Farmer | Iowa |
| 24 | Irene C Garrett | 26 | Wife | — | Iowa |
| 25 | Larry L Garrett | 4 | Son | — | Iowa |
| 26 | Robert E Garrett | 2 | Son | — | Iowa |
| 27 | Carl H Lee | 36 | Head | Farmer | Iowa |
| 28 | Rosie H Lee | 32 | Wife | — | Iowa |
| 29 | Virginia M Lee | 3 | Daughter | — | Iowa |
| 30 | Allen R Barr | 30 | Head | Farmer | Wisconsin |
| 31 | Clara A Barr | 29 | Wife | — | Iowa |
| 32 | Lawrence B Barr | 12 | Son | — | Iowa |
| 33 | Leona M Barr | 10 | Daughter | — | Iowa |
| 34 | Bettie S Barr | 2 | Son | — | Iowa |
| 35 | Ray Shilling | 31 | Head | Laborer | Nebraska |
| 36 | May L Shilling | 28 | Wife | — | Kansas |
| 37 | Charles T Shilling | 5 | Son | — | Iowa |
| 38 | Larry A Shilling | 4 | Son | — | Iowa |
| 39 | Donald J Shilling | 3 | Son | — | Iowa |
| 40 | Paul A Shilling | 1 | Son | — | 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)