MH
Mary Heath — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Black-Hawk-County, Iowa
Our Model Tree links this Mary Heath across the 1930 and 1940 US Censuses in Black-Hawk-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1924), then head of a 6-person household.
Age 16
b. ~1924
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Black-Hawk-County, Iowa |
| Surname | Heath |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Blackhawk |
| Additional Details | |
| Occupation | Maid |
| Industry | Private Home |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 36 |
| Highest Grade | H 3 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Maid |
| Township / Ward | Waterloo City |
| Est. Birth Year | ~1924 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Marguerite Heath | Head | — | 41 | ~1899 |
| Francis Heath | Son | — | 11 | ~1929 |
| Roberta Heath | Daughter | — | 15 | ~1925 |
| Charles Heath | Son | — | 13 | ~1927 |
| Mary Heath | Daughter | — | 16 | ~1924 |
| John Heath | Son | — | 18 | ~1922 |
Census Appearances
1930
Black Hawk, …
Daughter, age 6
Black Hawk, Iowa · implied b. ~1924 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Heath |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| 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
Black-Hawk-County, Iowa
Daughter, age 16
Black-Hawk-County, Iowa · implied b. ~1924 — 6 household members
| Surname | Heath |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Waterloo City |
| 1935 Residence (County) | Blackhawk |
| Occupation | Maid |
| Industry | Private Home |
| Class of Worker | PW |
| Hours Worked | 30 |
| Income (1939) | 36 |
| Highest Grade | H 3 |
| 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 Heath across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Heath
Daughter · 1940 · age 16 · b. ~1924 · Iowa
★ You are viewing this record
Sibling
Roberta Heath
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Heath
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Heath
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Heath
Sibling · 1940 · age 18
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-t0627-01140-00973)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Robert L. Ingersoll | 63 | Head | Boiler Maker | Iowa |
| 42 | Elizabeth Ingersoll | 57 | Wife | — | Iowa |
| 43 | William L. Johnson | 27 | Head | Retail Clerk | Iowa |
| 44 | Jeanette Johnson | 25 | Wife | Dental Asst. | Iowa |
| 45 | Jennie N. Ingersoll | 83 | Head | — | Pennsylvania |
| 46 | Hershel Hollingsworth | 43 | Lodger | Dish Washer | Illinois |
| 47 | Willis J. Hollenweider | 35 | Head | Teller | Iowa |
| 48 | Catherine M. Hollenweider | 34 | Wife | — | Iowa |
| 49 | John F. Hollenweider | 7 | Son | — | Iowa |
| 50 | Catherine L. Hollenweider | 2 | Daughter | — | Iowa |
| 51 | Floyd A. Banks | 50 | Head | Carpenter | Illinois |
| 52 | Emma A. Banks | 41 | Wife | — | Iowa |
| 53 | Fred O. Espey | 50 | Head | Eye Specialist | Wisconsin |
| 54 | Annie E. Espey | 61 | Mother | — | Minnesota |
| 55 | Edna L. Thies | 28 | Lodger | Cook | Iowa |
| 56 | Marguerite R. Heath | 41 | Head | Stenographer | Musician | Iowa |
| 57 | John C. (Jr) Heath | 18 | Son | Labor | Iowa |
| 58 | Mary C. Heath THIS PERSON | 16 | Daughter | Maid | Iowa |
| 59 | Roberta C. Heath | 15 | Daughter | — | Illinois |
| 60 | Charles T. Heath | 13 | Son | — | Illinois |
| 61 | Francis G. Heath | 11 | Son | — | Illinois |
| 62 | Bee M. Smith | 71 | Head | — | Iowa |
| 63 | Ruth M. Smith | 35 | Daughter | Secretary | Iowa |
| 64 | Lester J. Carr | 28 | Head | Superintendent | Iowa |
| 65 | Maxine M. Carr | 28 | Wife | — | Iowa |
| 66 | Donald K. Carr | 5 | Son | — | Iowa |
| 67 | Jane E. Carr | 3 | Daughter | — | Iowa |
| 68 | Leone M. Spudling | 30 | Sister-in-law | — | Iowa |
| 69 | Rose Carr | 49 | Mother | Practical Nurse | Iowa |
| 70 | Ella De France | 33 | Lodger | — | Ohio |
| 71 | Emery O. (Sr) Spudling | 74 | Father-in-law | — | Iowa |
| 72 | Edward J. Quinn | 50 | Head | Clerk | S. Dakota |
| 73 | Bertha M. Quinn | 47 | Wife | — | Iowa |
| 74 | James J. Quinn | 24 | Son | Telegrapher | Iowa |
| 75 | Richard P. Quinn | 19 | Son | Lens Grinder | Iowa |
| 76 | Dale J. Quinn | 18 | Son | — | Iowa |
| 77 | Louise K. Quinn | 16 | Daughter | — | Iowa |
| 78 | Thomas F. Quinn | 14 | Son | — | Iowa |
| 79 | Russell E. Quinn | 11 | Son | — | Iowa |
| 80 | Annette M. Quinn | 5 | Daughter | — | Iowa |
Related Census Records
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)