MH
Mary Harding — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Mary Harding across the 1930 and 1940 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1912), then head of a 6-person household.
Age 18
b. ~1912
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Harding |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | New Hampshire |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Lowell City |
| Est. Birth Year | ~1912 |
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 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Harding | Spouse | — | 43 | ~1887 |
| Mary Harding | Daughter | — | 18 | ~1912 |
| John Harding | Son | — | 16 | ~1914 |
| Donald Harding | Son | — | 9 | ~1921 |
| Isabel Harding | Daughter | — | 13 | ~1917 |
| John Harding | Head | — | 43 | ~1887 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 18
Middlesex, Massachusetts · implied b. ~1912 — 6 household members
| Surname | Harding |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | New Hampshire |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Spouse, age 28
Middlesex-County, Massachusetts · implied b. ~1912 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hardone |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Class of Worker | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| 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 Harding across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Harding
Daughter · 1930 · age 18 · b. ~1912 · Massachusetts
★ You are viewing this record
Sibling
Donald Harding
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Isabel Harding
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Harding
Sibling · 1930 · age 16
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:massachusettscensus00reel921:0991)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert S Potter | 36 | Head | Manager | Massachusetts |
| 2 | Anna L Potter | 30 | Wife | — | Pennsylvania |
| 3 | Robert Lowe | 30 | Head | Patternmaker | Scotland |
| 4 | Mary M Lowe | 31 | Wife | — | Scotland |
| 5 | Robert Lowe | 4 | Son | — | Scotland |
| 6 | Stewart Lowe | 3 | Son | — | Scotland |
| 7 | Isabelle B Lowe | 1 | Daughter | — | Scotland |
| 8 | Henry Sargent | 31 | Head | Asst. Supt. | Massachusetts |
| 9 | Anna Sargent | 31 | Wife | — | Massachusetts |
| 10 | Thomas F St. John | 51 | Head | Asst. Paymaster | Massachusetts |
| 11 | Catherine St. John | 48 | Wife | — | Ireland Free State |
| 12 | Thomas St. John | 23 | Son | Clerk | Massachusetts |
| 13 | William St. John | 22 | Son | Student | Massachusetts |
| 14 | Helen St. John | 20 | Daughter | — | Massachusetts |
| 15 | George H Donovan | 52 | Head | General Paymaster | Massachusetts |
| 16 | Mary E Donovan | 52 | Wife | — | Massachusetts |
| 17 | Mary Donovan | 76 | Mother | — | Ireland Free State |
| 18 | Margaret Donovan | 45 | Sister | — | Massachusetts |
| 19 | Thomas Donovan | 43 | Brother | Conductor | Massachusetts |
| 20 | Leon F Blanchard | 48 | Head | Estimator | Massachusetts |
| 21 | Clara Blanchard | 54 | Wife | — | Canada French |
| 22 | Beatrice Blanchard | 46 | Sister | — | Canada French |
| 23 | Joseph Price | 52 | Head | Foreman | Massachusetts |
| 24 | Nellie Price | 43 | Wife | — | Maine |
| 25 | Alvin Gray | 34 | Head | Salesman | New Hampshire |
| 26 | Florence Gray | 34 | Wife | — | Arkansas |
| 27 | Barbara Gray | 12 | Daughter | — | Massachusetts |
| 28 | Ernest Ross | 42 | Head | Salesman | Canada English |
| 29 | Edna Ross | 40 | Wife | — | Sweden |
| 30 | Richard Ross | 10 | Son | Student | Massachusetts |
| 31 | Fred Donahue | 47 | Head | City Messenger | Pennsylvania |
| 32 | Julia Donahue | 51 | Wife | — | Massachusetts |
| 33 | Edward J Marcus | 33 | Head | Manager | Massachusetts |
| 34 | Flora Marcus | 33 | Wife | — | Massachusetts |
| 35 | Natalie Marcus | 8 | Daughter | — | Massachusetts |
| 36 | John Harding | 43 | Head | Fireman | Massachusetts |
| 37 | Mary Harding | 43 | Wife | Clerk | New Hampshire |
| 38 | Mary Harding THIS PERSON | 18 | Daughter | — | Massachusetts |
| 39 | John Harding | 16 | Son | — | Massachusetts |
| 40 | Isabel Harding | 13 | Daughter | — | Massachusetts |
| 41 | Donald Harding | 9 | Son | — | Massachusetts |
| 42 | John Maciel | 60 | Head | Overseer | Canada English |
| 43 | Anna Maciel | 53 | Wife | — | Canada English |
| 44 | Maurice Fortier | 44 | Head | Coach Carpenter | Maine |
| 45 | Elizabeth Fortier | 43 | Wife | — | Maine |
| 46 | Mark Kilpatrick | 53 | Head | — | New York |
| 47 | Mary Kilpatrick | 54 | Daughter | Teacher | Massachusetts |
| 48 | Isabelle Kilpatrick | 43 | Daughter | Teacher | Massachusetts |
| 49 | Isabelle Kilpatrick | 38 | Sister | Stenographer | Massachusetts |
| 50 | Robert Gray | 10 | 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)