MP
Mary Peck — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lake-County, Indiana
Our Model Tree links this Mary Peck across the 1930 and 1940 US Censuses in Lake-County, Indiana (XGBoost, ~Confirmed) — first a daughter (b.~1930), then head of a 7-person household.
Age 10
b. ~1930
Female
Daughter
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lake-County, Indiana |
| Surname | Peck |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Hammond City |
| 1935 Residence (County) | Lake |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Township / Ward | Hammond City |
| Est. Birth Year | ~1930 |
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 |
|---|---|---|---|---|
| Fred Peck | Head | — | 37 | ~1903 |
| Lois Peck | Daughter | — | 12 | ~1928 |
| Jean Goodyear | Other | — | 10 | ~1930 |
| Dorothy Peck | Spouse | — | 33 | ~1907 |
| Mary Peck | Daughter | — | 10 | ~1930 |
| Louise Peck | Daughter | — | 13 | ~1927 |
| George Peck | Son | — | 15 | ~1925 |
Census Appearances
1930
Lake, Indiana
Daughter, age
Lake, Indiana · implied b. ~1930 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peck |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Indiana |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Lake-County, Indiana
Daughter, age 10
Lake-County, Indiana · implied b. ~1930 — 7 household members
| Surname | Peck |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Hammond City |
| 1935 Residence (County) | Lake |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 Peck across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Peck
Daughter · 1940 · age 10 · b. ~1930 · Indiana
★ You are viewing this record
Sibling
Louise Peck
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lois Peck
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Peck
Sibling · 1940 · age 15
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 — Lake-County, Indiana
Open full size
1940 US Federal Census — Lake-County, Indiana
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01066-00670)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 42 | Alex Gronkiewicz | 45 | Head | Carpenter | Poland |
| 43 | Josephine Gronkiewicz | 41 | Wife | — | Illinois |
| 44 | Stanley Gronkiewicz | 21 | Son | Laborer | Indiana |
| 45 | Dorothy Gronkiewicz | 20 | Daughter | Packer | Indiana |
| 46 | Florence Gronkiewicz | 17 | Daughter | — | Indiana |
| 47 | Fred Peck | 37 | Head | Foreman | Minnesota |
| 48 | Dorothy Peck | 33 | Wife | — | Indiana |
| 49 | George Peck | 15 | Son | — | Indiana |
| 50 | Louise Peck | 13 | Daughter | — | Indiana |
| 51 | Lois Peck | 12 | Daughter | — | Indiana |
| 52 | Mary Peck THIS PERSON | 10 | Daughter | — | Indiana |
| 53 | Jean Goodyear | 10 | Lodger | — | Indiana |
| 54 | Andrew Spolnik | 53 | Head | Carpenter | Poland |
| 55 | Martha Spolnik | 50 | Wife | — | Illinois |
| 56 | Edward Spolnik | 29 | Son | Proprietor | Indiana |
| 57 | Frank Spolnik | 26 | Son | Proprietor | Indiana |
| 58 | Dorothy Spolnik | 20 | Daughter | — | Indiana |
| 59 | Joseph Fillenback | 47 | Head | Superintendent | Illinois |
| 60 | Margaret Fillenback | 44 | Wife | — | Indiana |
| 61 | Adele Fillenback | 17 | Daughter | — | Indiana |
| 62 | Jane Fillenback | 13 | Daughter | — | Indiana |
| 63 | John M. Keilman | 78 | Father-in-law | — | Indiana |
| 64 | Elizabeth Keilman | 74 | Mother-in-law | — | Germany |
| 65 | Henry Keilman | 48 | Head | Superintendent | Indiana |
| 66 | Gladys Keilman | 44 | Wife | — | Wisconsin |
| 67 | Joan Keilman | 15 | Daughter | — | Indiana |
| 68 | Marilyn Keilman | 9 | Daughter | — | Indiana |
| 69 | John Hengler | 37 | Head | Electrician | Indiana |
| 70 | Cecelia Hengler | 41 | Wife | — | Indiana |
| 71 | Emma Klassen | 63 | Mother-in-law | — | Indiana |
| 72 | Charles Franklin | 26 | Head | Chemist | Indiana |
| 73 | Lillian Franklin | 26 | Wife | Belt Operator | Illinois |
| 74 | Oscar F. Ostrom | 49 | Head | Machinist | Sweden |
| 75 | Alice Ostrom | 50 | Wife | — | Indiana |
| 76 | Carl Ostrom | 12 | Son | — | Indiana |
| 77 | Arthur Fanzlaw | 45 | Head | Milk Driver | Illinois |
| 78 | Mayme Fanzlaw | 45 | Wife | — | Illinois |
| 79 | Lorraine Fanzlaw | 21 | Daughter | — | Illinois |
| 80 | Theodore Paratizinski | 49 | Head | Bricklayer | Poland |
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)