MG
Mary Grace — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Mercer-County, Pennsylvania
Our Model Tree links this Mary Grace across the 1930 and 1940 US Censuses in Mercer-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1920), then head of a 8-person household.
Age 20
b. ~1920
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, Pennsylvania |
| Surname | Grace |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Greenville (Town) |
| 1935 Residence (County) | Mercer |
| Additional Details | |
| Occupation | Receptionist |
| Industry | Dentist office |
| Class of Worker | PW |
| Income (1939) | 266 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Receptionist |
| Township / Ward | Greenville Town |
| Est. Birth Year | ~1920 |
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 |
|---|---|---|---|---|
| Frederick Grace | Son | — | 4 | ~1936 |
| Ruth Grace | Spouse | — | 46 | ~1894 |
| H Grace | Head | — | 44 | ~1896 |
| Margaret Grace | Daughter | — | 11 | ~1929 |
| Frances Grace | Daughter | — | 16 | ~1924 |
| Mildred Grace | Daughter | — | 14 | ~1926 |
| Mary Grace | Daughter | — | 20 | ~1920 |
| Herbert Grace | Son | — | 17 | ~1923 |
Census Appearances
1930
Mercer, Pennsylvania
Daughter, age 10
Mercer, Pennsylvania · implied b. ~1920 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Groce |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Mercer-County, Pennsylvania
Daughter, age 20
Mercer-County, Pennsylvania · implied b. ~1920 — 8 household members
| Surname | Grace |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Greenville (Town) |
| 1935 Residence (County) | Mercer |
| Occupation | Receptionist |
| Industry | Dentist office |
| Class of Worker | PW |
| Income (1939) | 266 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Grace across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Grace
Daughter · 1940 · age 20 · b. ~1920 · Pennsylvania
★ You are viewing this record
Sibling
Frederick Grace
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Herbert Grace
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Grace
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mildred Grace
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Grace
Sibling · 1940 · age 11
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 — Mercer-County, Pennsylvania
Open full size
1940 US Federal Census — Mercer-County, Pennsylvania
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-03570-00744)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Rosetta Gano | 63 | Wife | — | Pennsylvania |
| 42 | Alvin E. Bohler | Behler | 65 | Head | Barber | Pennsylvania |
| 43 | Clara B. Bohler | Behler | 57 | Wife | Barber | Pennsylvania |
| 44 | Glen Watson | 46 | Head | Laborer | Pennsylvania |
| 45 | Carrie S. Watson | 46 | Wife | — | Pennsylvania |
| 46 | Frederick Howard | 56 | Head | Clerk | Pennsylvania |
| 47 | Ethel H. Buys | 46 | Housekeeper | Housekeeper | Pennsylvania |
| 48 | Doris Buys | 15 | Housekeeper's son | — | Pennsylvania |
| 49 | James F. Laird | 56 | Head | Machinist | Pennsylvania |
| 50 | Pearl Laird | 50 | Wife | — | Pennsylvania |
| 51 | Earl Redfoot | 30 | Head | Body Repairman | Pennsylvania |
| 52 | Viola R. Redfoot | 22 | Wife | — | Pennsylvania |
| 53 | Daniel Redfoot | 3 | Son | — | Pennsylvania |
| 54 | Frederick Ropple | 76 | Head | — | Germany |
| 55 | Sophia V. Ropple | 76 | Wife | — | Pennsylvania |
| 56 | Raymond Hurst | 32 | Head | Clerk | Pennsylvania |
| 57 | Ida S. Hurst | 31 | Wife | — | Pennsylvania |
| 58 | Donald Hurst | 8 | Son | — | Pennsylvania |
| 59 | James Hurst | 5 | Son | — | Pennsylvania |
| 60 | H. L. Grace | 44 | Head | Riveter | Pennsylvania |
| 61 | Ruth Grace | 46 | Wife | — | Pennsylvania |
| 62 | Mary Grace THIS PERSON | 20 | Daughter | Receptionist | Pennsylvania |
| 63 | Herbert Grace | 17 | Son | — | Pennsylvania |
| 64 | Frances Grace | 16 | Daughter | — | Pennsylvania |
| 65 | Mildred Grace | 14 | Daughter | — | Pennsylvania |
| 66 | Margaret Grace | 11 | Daughter | — | Pennsylvania |
| 67 | Frederick Grace | 4 | Son | — | Pennsylvania |
| 68 | Charles S. Swartz | 66 | Head | — | Pennsylvania |
| 69 | Sara Swartz | 65 | Wife | — | Pennsylvania |
| 70 | Josephine Swartz | 34 | Daughter | Clerk | Pennsylvania |
| 71 | Lewis Ringeisen | 53 | Head | Machinist | Germany |
| 72 | Stella V. Ringeisen | 48 | Wife | — | Pennsylvania |
| 73 | Albert Ringeisen | 23 | Son | Tinner | Pennsylvania |
| 74 | Stanley Massena | 32 | Head | Punch Press Operator | Ohio |
| 75 | Olive S. Massena | 26 | Wife | — | Pennsylvania |
| 76 | William Massena | 4 | Son | — | Pennsylvania |
| 77 | Richard Massena | 2 | Son | — | Pennsylvania |
| 78 | Clelia Massena | 0 | Daughter | — | Pennsylvania |
| 79 | James Ferguson | 26 | Head | Machinist | Pennsylvania |
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)