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Mary Mcconnell — 1940 US Census Record
Model Tree available1940 United States Federal Census · Decatur-County, Iowa
Our Model Tree links this Mary Mcconnell across the 1920, 1930 and 1940 US Censuses in Decatur-County, Iowa (XGBoost, ~Confirmed), with identified parents Bert & Lent — first a daughter (b.~1918), then head of a 4-person household.
Age 22
b. ~1918
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Decatur-County, Iowa |
| Surname | McConnell |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Grand River City |
| 1935 Residence (County) | Decatur County |
| Additional Details | |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Grand River City |
| Est. Birth Year | ~1918 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Bert Mcconnell | Head | — | 51 | ~1889 |
| Nancy Mcconnell | Spouse | — | 51 | ~1889 |
| Leo Mcconnell | Son | — | 16 | ~1924 |
| Mary Mcconnell | Daughter | — | 22 | ~1918 |
Census Appearances
1920
Decatur, Iowa
Daughter, age 2
Decatur, Iowa · implied b. ~1918 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McConnell |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Decatur, Iowa
Daughter, age 12
Decatur, Iowa · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McConnell |
| Given Name | Mary M |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| 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
Decatur-County, Iowa
Daughter, age 22
Decatur-County, Iowa · implied b. ~1918 — 4 household members
| Surname | McConnell |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Grand River City |
| 1935 Residence (County) | Decatur County |
| Highest Grade | H 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 Mcconnell across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Bert Mcconnell (~0.92 confidence) and father Lent Mcconnell (~0.92 confidence) and mother Nancy Mcconnell (~0.92 confidence) and father Ted Mcconnell (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Bert Mcconnell
b. ~1889
Source father
● Household
· direct · ~0.92
Father
Lent Mcconnell
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Nancy Mcconnell
b. ~1889
Source mother
● Household
· direct · ~0.92
Father
Ted Mcconnell
b. ~1889
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Mcconnell
Daughter · 1940 · age 22 · b. ~1918 · Iowa
★ You are viewing this record
Sibling
Leo Mcconnell
Sibling · 1940 · age 16
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 — Decatur-County, Iowa
Open full size
1940 US Federal Census — Decatur-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01154-00739)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | James H. Harp | 33 | Head | Laborer | Iowa |
| 2 | Allie M. Harp | 24 | Wife | — | Iowa |
| 3 | Jackie Lee Harp | 5 | Son | — | Iowa |
| 4 | Bert Mcconnell | 51 | Head | Proprietor | Iowa |
| 5 | Nancy D. Mcconnell | 51 | Wife | — | Iowa |
| 6 | Mary M. Mcconnell THIS PERSON | 22 | Daughter | — | Iowa |
| 7 | Leo E. Mcconnell | 16 | Son | — | Iowa |
| 8 | George P. Overholser | 56 | Head | — | Iowa |
| 9 | Ethel E. Overholser | 50 | Wife | — | Missouri |
| 10 | William C. Overholser | 15 | Son | — | Iowa |
| 11 | Emma E. Vickerley | 75 | Head | — | Iowa |
| 12 | Harold Vickerley | 35 | Son | House Painter | Iowa |
| 13 | S. Warren Day | 58 | Head | — | Iowa |
| 14 | Medora Day | 55 | Wife | — | Iowa |
| 15 | Emmett Kyle | 77 | Head | — | Iowa |
| 16 | Margaret A. Kyle | 78 | Wife | — | Iowa |
| 17 | Harry D. Mcdowell | 68 | Head | — | Iowa |
| 18 | Lillie Mcdowell | 62 | Wife | — | Iowa |
| 19 | Annie D. Binning | 68 | Head | — | Iowa |
| 20 | Elizabeth Dewitt | 84 | Head | — | Iowa |
| 21 | William Dewitt | 55 | Son | Farmer | Iowa |
| 22 | Mary C. Dewitt | 65 | Daughter in law | — | Iowa |
| 23 | Hedrych D. Bryant | 57 | Head | Stock Buyer | Iowa |
| 24 | Zettie Bryant | 54 | Wife | — | Iowa |
| 25 | John Bryant | 18 | Son | Houseworker | Iowa |
| 26 | Raymond Bryant | 16 | Son | — | Iowa |
| 27 | Derwin Bryant | 11 | Son | — | Iowa |
| 28 | Keith E. Hall | 31 | Head | Publisher | Iowa |
| 29 | Francis Lucile Hall | 30 | Wife | Census Enumerator | Missouri |
| 30 | Mary Louise Hall | 1 | Daughter | — | Iowa |
| 31 | Samuel Black | 77 | Head | — | Indiana |
| 32 | Catherine S. Black | 75 | Wife | — | Iowa |
| 33 | Carrie E. Brown | 72 | Head | — | Illinois |
| 34 | William Bryant | 43 | Head | Truck Driver | Iowa |
| 35 | Gladys R. Bryant | 36 | Wife | — | Iowa |
| 36 | Carmaleta Bryant | 15 | Daughter | — | Iowa |
| 37 | Verle Bryant | 11 | Son | — | Iowa |
| 38 | Oleta Bryant | 3 | Daughter | — | Iowa |
| 39 | Homer O. Buell | 53 | Head | Farmer | Iowa |
| 40 | Amy Buell | 56 | Wife | — | Iowa |
Pedigree Summary
Mary + 1 sibling
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)