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Mary Barnes — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this Mary Barnes across the 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 8-person household.
Age 17
b. ~1923
Female
Daughter
Born: South Dakota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Barnes |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | South Dakota |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | H 3 |
| 1935 Residence | Same Place |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
| Township / Ward | Waterloo City |
| Est. Birth Year | ~1923 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Barnes | Daughter | — | 17 | ~1923 |
| Adeline Barnes | Daughter | — | 21 | ~1919 |
| Joan Barnes | Daughter | — | 7 | ~1933 |
| Beverly Barnes | Daughter | — | 12 | ~1928 |
| Betty Barnes | Daughter | — | 14 | ~1926 |
| Floyd Barnes | Head | — | 48 | ~1892 |
| Vernon Barnes | Son | — | 19 | ~1921 |
| Clara Barnes | Spouse | — | 47 | ~1893 |
Census Appearances
1930
Black Hawk, …
Daughter, age 7
Black Hawk, Iowa · implied b. ~1923 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Barnes |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | South Dakota |
| Father's Birthplace | Iowa |
| Mother's Birthplace | South Dakota |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1940
Black-Hawk-County, Iowa
Daughter, age 17
Black-Hawk-County, Iowa · implied b. ~1923 — 8 household members
| Surname | Barnes |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | South Dakota |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Black Hawk |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | H 3 |
| 1935 Residence | Same Place |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
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 Barnes across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Barnes
Daughter · 1940 · age 17 · b. ~1923 · Iowa
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Sibling
Betty Barnes
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Beverly Barnes
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Adeline Barnes
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Vernon Barnes
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joan Barnes
Sibling · 1940 · age 7
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
40 people indexed on this census page (nara:1940:m-t0627-01140-00867)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Phyllis Flynn | 12 | Daughter | — | Iowa |
| 42 | William Mclone | 75 | Head | — | Iowa |
| 43 | Katherine Mclone | 66 | Wife | — | Illinois |
| 44 | William J. Mcbride | 42 | Head | Assembly Man | Illinois |
| 45 | Helen Mcbride | 39 | Wife | Bookkeeper | Iowa |
| 46 | William J. Jr. Mcbride | 15 | Son | — | Iowa |
| 47 | Farrell Prince | 22 | Housekeeper | Housekeeper | Iowa |
| 48 | John Owen | 39 | Head | Trucker-Propellor | Iowa |
| 49 | Genevieve Owen | 42 | Wife | Np | Iowa |
| 50 | Nanette Owen | 6 | Daughter | — | Iowa |
| 51 | Milo Roch | 44 | Head | Cleaner & Presser | Illinois |
| 52 | Gertrude Roch | 40 | Wife | — | Iowa |
| 53 | Arvella M. Roch | 18 | Daughter | Binder | Iowa |
| 54 | Charlotte A. Roch | 16 | Daughter | — | Iowa |
| 55 | Milo Jr. Roch | 6 | Son | — | Iowa |
| 56 | James Roch | 4 | Son | — | Iowa |
| 57 | Arthur Humpal | 35 | Head | Machinist | Iowa |
| 58 | Evelyn Humpal | 30 | Wife | — | Iowa |
| 59 | Marylin Humpal | 8 | Daughter | — | Iowa |
| 60 | Jerome Humpal | 5 | Son | — | Iowa |
| 61 | Richard Humpal | 4 | Son | — | Iowa |
| 62 | Joyce Humpal | 3 | Daughter | — | Iowa |
| 63 | Lewis Barnes | 39 | Head | Machinist | Iowa |
| 64 | Amy Barnes | 31 | Wife | — | Iowa |
| 65 | Betty J. Barnes | 12 | Daughter | — | Iowa |
| 66 | Katherine A. Barnes | 7 | Daughter | — | Iowa |
| 67 | Mary Lou Barnes | 5 | Daughter | — | Iowa |
| 68 | Floyd Barnes | 48 | Head | Mechanic | Iowa |
| 69 | Clara Barnes | 47 | Wife | — | South Dakota |
| 70 | Vernon Barnes | 19 | Son | Apprentice Tool Maker | South Dakota |
| 71 | Adeline Barnes | 21 | Daughter | Laborer | South Dakota |
| 72 | Mary M. Barnes THIS PERSON | 17 | Daughter | — | South Dakota |
| 73 | Betty Barnes | 14 | Daughter | — | South Dakota |
| 74 | Beverly Barnes | 12 | Daughter | — | Iowa |
| 75 | Joan Barnes | 7 | Daughter | — | Iowa |
| 76 | Robert Wiggin | 26 | Head | Clerk | Iowa |
| 77 | Bertha Wiggin | 23 | Wife | — | Iowa |
| 78 | Gary Wiggin | 3 | Son | — | Iowa |
| 79 | Leo Kramer | 39 | Head | Plumber | Iowa |
| 80 | Viola Kramer | 37 | Wife | Bookkeeper | 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)