MC
Mary Case — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Mary Case across the 1930 and 1940 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 11-person household.
Age 9
b. ~1921
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Case |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Penn-State |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | City Of Cambridge |
| Est. Birth Year | ~1921 |
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.
11 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Sarah Case | Other | — | 39 | ~1891 |
| Helen Case | Daughter | — | 7 | ~1923 |
| Joseph Case | Son | — | 3 | ~1927 |
| Kathleen Case | Daughter | — | 11 | ~1919 |
| Raymond Case | Son | — | 15 | ~1915 |
| George Case | Son | — | 17 | ~1913 |
| Everett Case | Son | — | 14 | ~1916 |
| John Case | Son | — | 13 | ~1917 |
| Joseph Case | Head | — | 52 | ~1878 |
| Mary Case | Daughter | — | 9 | ~1921 |
| Dorothy Case | Daughter | — | 5 | ~1925 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 9
Middlesex, Massachusetts · implied b. ~1921 — 11 household members
| Surname | Case |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Penn-State |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Other, age 19
Middlesex-County, Massachusetts · implied b. ~1921 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Chase |
| Given Name | Mary |
| Relationship to Head | Housekeeper |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Woburn city |
| 1935 Residence (County) | Middlesex |
| Occupation | Housekeeper |
| Industry | Private family |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 416 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Case across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Case
Daughter · 1930 · age 9 · b. ~1921 · Massachusetts
★ You are viewing this record
Sibling
Helen Case
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kathleen Case
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Case
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Case
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Everett Case
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Case
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Case
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Case
Sibling · 1930 · age 3
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
1930 US Federal Census — Middlesex, Massachusetts
Open full size
1930 US Federal Census — Middlesex, Massachusetts
Page Contents
50 people indexed on this census page (ia:1930:massachusettscensus00reel916:0320)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Heller James Kelley | 78 | Father | — | Penn-State |
| 2 | Thiel Daniel Kelley | 40 | Cousin | Candy Maker | Canada-Eng |
| 3 | Konstanty Sarzynski | 49 | Head | Laborer | Poland |
| 4 | Mary Sarzynski | 38 | Wife-H | — | Poland |
| 5 | Lillian Sarzynski | 19 | Daughter | Clerical | Massachusetts |
| 6 | Helen Sarzynski | 17 | Daughter | Clerical | Massachusetts |
| 7 | Frank Sarzynski | 15 | Son | — | Massachusetts |
| 8 | Marion Sarzynski | 10 | Daughter | — | Massachusetts |
| 9 | Antoinette Sarzynski | 8 | Daughter | — | Massachusetts |
| 10 | Henry Sarzynski | 6 | Son | — | Massachusetts |
| 11 | Thomas Sarzynski | 4 | Son | — | Massachusetts |
| 12 | Robert Jordan | 46 | Head | Mechanic | Canada-English |
| 13 | Alice Jordan | 46 | Wife-H | — | Canada-English |
| 14 | Joseph Jordan | 14 | Son | — | Massachusetts |
| 15 | Muriel Jordan | 12 | Daughter | — | Massachusetts |
| 16 | Robert Jordan | 11 | Son | — | Massachusetts |
| 17 | Alice Jordan | 6 | Daughter | — | Massachusetts |
| 18 | Frederick Jordan | 4 | Son | — | Massachusetts |
| 19 | Henry Antonevicz | 41 | Head | Salesman | Poland |
| 20 | Veronica Antonevicz | 42 | Wife-H | — | Poland |
| 21 | Charlotte Antonevicz | 14 | Daughter | — | Massachusetts |
| 22 | Helen Antonevicz | 13 | Daughter | — | Massachusetts |
| 23 | Mary Antonevicz | 11 | Daughter | — | Massachusetts |
| 24 | Henry Antonevicz | 6 | Son | — | Massachusetts |
| 25 | Frank L. Van Vleck | 52 | Head | Chauffeur | Vermont |
| 26 | Mary B. Van Vleck | 51 | Wife-H | — | England |
| 27 | Estelle Van Vleck | 23 | Daughter | — | Massachusetts |
| 28 | Eleanor Van Vleck | 16 | Daughter | — | Massachusetts |
| 29 | Marie P. Van Vleck | 8 | Daughter | — | Massachusetts |
| 30 | Arthur Bisson | 55 | Head | Machinist | Massachusetts |
| 31 | Jennie L. Bisson | 50 | Wife | — | Massachusetts |
| 32 | Vivian L. Bisson | 14 | Daughter | — | Massachusetts |
| 33 | Joseph Case | 52 | Head | Mechanic Auto | Massachusetts |
| 34 | Sarah Case | 39 | Wife-H | — | Penn-State |
| 35 | George Case | 17 | Son | Machine Hand | Massachusetts |
| 36 | Raymond Case | 15 | Son | Dishwasher | Massachusetts |
| 37 | Everett Case | 14 | Son | — | Massachusetts |
| 38 | John Case | 13 | Son | — | Massachusetts |
| 39 | Kathleen Case | 11 | Daughter | — | Massachusetts |
| 40 | Mary Case THIS PERSON | 9 | Daughter | — | Massachusetts |
| 41 | Helen Case | 7 | Daughter | — | Massachusetts |
| 42 | Dorothy Case | 5 | Daughter | — | Massachusetts |
| 43 | Joseph Case | 3 | Son | — | Massachusetts |
| 44 | Nicholas Parsons | 41 | Head | Carpenter | Canada-English |
| 45 | Lotta Parsons | 38 | Wife-H | — | Canada-English |
| 46 | Hazel Parsons | 16 | Daughter | — | Massachusetts |
| 47 | Dorothy Parsons | 14 | Daughter | — | Massachusetts |
| 48 | Ralph Parsons | 9 | Son | — | Massachusetts |
| 49 | Eleanor Parsons | 7 | Daughter | — | Massachusetts |
| 50 | Edward Parsons | 5 | Son | — | Massachusetts |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)